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db045db @dhh Initial
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1 require 'yaml'
aabf909 @jeremy Correct reader method generation for primary key attribute: handle case ...
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2 require 'set'
a15e02d @josevalim Unify benchmark APIs.
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3 require 'active_support/benchmarkable'
f5d720f @jeremy Opt in to Dependencies
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4 require 'active_support/dependencies'
5f222c5 @jeremy Remove 'core' fluff. Hookable ActiveSupport.load_all!
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5 require 'active_support/time'
e8550ee @jeremy Cherry-pick core extensions
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6 require 'active_support/core_ext/class/attribute_accessors'
7 require 'active_support/core_ext/class/delegating_attributes'
8 require 'active_support/core_ext/class/inheritable_attributes'
9 require 'active_support/core_ext/array/extract_options'
10 require 'active_support/core_ext/hash/deep_merge'
11 require 'active_support/core_ext/hash/indifferent_access'
12 require 'active_support/core_ext/hash/slice'
13 require 'active_support/core_ext/string/behavior'
f7b0a85 @jeremy Use Object#singleton_class instead of #metaclass. Prefer Ruby's choice.
jeremy authored
14 require 'active_support/core_ext/object/singleton_class'
a7fd564 @lifo Add Model.select/group/order/limit/joins/conditions/preload/eager_load c...
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15 require 'active_support/core_ext/module/delegation'
105f9b8 @fxn adds missing requires for Object#duplicable?
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16 require 'active_support/core_ext/object/duplicable'
39d6f9e @wycats Make many parts of Rails lazy. In order to facilitate this,
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17 require 'arel'
18 require 'active_record/errors'
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19
20 module ActiveRecord #:nodoc:
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21 # Active Record objects don't specify their attributes directly, but rather infer them from the table definition with
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22 # which they're linked. Adding, removing, and changing attributes and their type is done directly in the database. Any change
23 # is instantly reflected in the Active Record objects. The mapping that binds a given Active Record class to a certain
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24 # database table will happen automatically in most common cases, but can be overwritten for the uncommon ones.
25 #
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26 # See the mapping rules in table_name and the full example in link:files/README.html for more insight.
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27 #
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28 # == Creation
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29 #
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30 # Active Records accept constructor parameters either in a hash or as a block. The hash method is especially useful when
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31 # you're receiving the data from somewhere else, like an HTTP request. It works like this:
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32 #
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33 # user = User.new(:name => "David", :occupation => "Code Artist")
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34 # user.name # => "David"
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35 #
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36 # You can also use block initialization:
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37 #
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38 # user = User.new do |u|
39 # u.name = "David"
40 # u.occupation = "Code Artist"
41 # end
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42 #
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43 # And of course you can just create a bare object and specify the attributes after the fact:
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44 #
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45 # user = User.new
46 # user.name = "David"
47 # user.occupation = "Code Artist"
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48 #
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49 # == Conditions
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50 #
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51 # Conditions can either be specified as a string, array, or hash representing the WHERE-part of an SQL statement.
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52 # The array form is to be used when the condition input is tainted and requires sanitization. The string form can
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53 # be used for statements that don't involve tainted data. The hash form works much like the array form, except
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54 # only equality and range is possible. Examples:
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55 #
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56 # class User < ActiveRecord::Base
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57 # def self.authenticate_unsafely(user_name, password)
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58 # find(:first, :conditions => "user_name = '#{user_name}' AND password = '#{password}'")
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59 # end
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60 #
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61 # def self.authenticate_safely(user_name, password)
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62 # find(:first, :conditions => [ "user_name = ? AND password = ?", user_name, password ])
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63 # end
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64 #
65 # def self.authenticate_safely_simply(user_name, password)
66 # find(:first, :conditions => { :user_name => user_name, :password => password })
67 # end
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68 # end
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69 #
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70 # The <tt>authenticate_unsafely</tt> method inserts the parameters directly into the query and is thus susceptible to SQL-injection
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71 # attacks if the <tt>user_name</tt> and +password+ parameters come directly from an HTTP request. The <tt>authenticate_safely</tt> and
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72 # <tt>authenticate_safely_simply</tt> both will sanitize the <tt>user_name</tt> and +password+ before inserting them in the query,
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73 # which will ensure that an attacker can't escape the query and fake the login (or worse).
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74 #
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75 # When using multiple parameters in the conditions, it can easily become hard to read exactly what the fourth or fifth
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76 # question mark is supposed to represent. In those cases, you can resort to named bind variables instead. That's done by replacing
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77 # the question marks with symbols and supplying a hash with values for the matching symbol keys:
78 #
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79 # Company.find(:first, :conditions => [
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80 # "id = :id AND name = :name AND division = :division AND created_at > :accounting_date",
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81 # { :id => 3, :name => "37signals", :division => "First", :accounting_date => '2005-01-01' }
82 # ])
83 #
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84 # Similarly, a simple hash without a statement will generate conditions based on equality with the SQL AND
85 # operator. For instance:
86 #
87 # Student.find(:all, :conditions => { :first_name => "Harvey", :status => 1 })
88 # Student.find(:all, :conditions => params[:student])
89 #
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90 # A range may be used in the hash to use the SQL BETWEEN operator:
91 #
92 # Student.find(:all, :conditions => { :grade => 9..12 })
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93 #
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94 # An array may be used in the hash to use the SQL IN operator:
95 #
96 # Student.find(:all, :conditions => { :grade => [9,11,12] })
97 #
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98 # When joining tables, nested hashes or keys written in the form 'table_name.column_name' can be used to qualify the table name of a
99 # particular condition. For instance:
100 #
101 # Student.find(:all, :conditions => { :schools => { :type => 'public' }}, :joins => :schools)
102 # Student.find(:all, :conditions => { 'schools.type' => 'public' }, :joins => :schools)
103 #
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104 # == Overwriting default accessors
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105 #
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106 # All column values are automatically available through basic accessors on the Active Record object, but sometimes you
107 # want to specialize this behavior. This can be done by overwriting the default accessors (using the same
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108 # name as the attribute) and calling <tt>read_attribute(attr_name)</tt> and <tt>write_attribute(attr_name, value)</tt> to actually change things.
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109 # Example:
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110 #
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111 # class Song < ActiveRecord::Base
112 # # Uses an integer of seconds to hold the length of the song
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113 #
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114 # def length=(minutes)
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115 # write_attribute(:length, minutes.to_i * 60)
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116 # end
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117 #
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118 # def length
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119 # read_attribute(:length) / 60
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120 # end
121 # end
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122 #
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123 # You can alternatively use <tt>self[:attribute]=(value)</tt> and <tt>self[:attribute]</tt> instead of <tt>write_attribute(:attribute, value)</tt> and
124 # <tt>read_attribute(:attribute)</tt> as a shorter form.
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125 #
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126 # == Attribute query methods
127 #
128 # In addition to the basic accessors, query methods are also automatically available on the Active Record object.
129 # Query methods allow you to test whether an attribute value is present.
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130 #
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131 # For example, an Active Record User with the <tt>name</tt> attribute has a <tt>name?</tt> method that you can call
132 # to determine whether the user has a name:
133 #
134 # user = User.new(:name => "David")
135 # user.name? # => true
136 #
137 # anonymous = User.new(:name => "")
138 # anonymous.name? # => false
139 #
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140 # == Accessing attributes before they have been typecasted
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141 #
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142 # Sometimes you want to be able to read the raw attribute data without having the column-determined typecast run its course first.
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143 # That can be done by using the <tt><attribute>_before_type_cast</tt> accessors that all attributes have. For example, if your Account model
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144 # has a <tt>balance</tt> attribute, you can call <tt>account.balance_before_type_cast</tt> or <tt>account.id_before_type_cast</tt>.
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145 #
146 # This is especially useful in validation situations where the user might supply a string for an integer field and you want to display
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147 # the original string back in an error message. Accessing the attribute normally would typecast the string to 0, which isn't what you
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148 # want.
149 #
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150 # == Dynamic attribute-based finders
151 #
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152 # Dynamic attribute-based finders are a cleaner way of getting (and/or creating) objects by simple queries without turning to SQL. They work by
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153 # appending the name of an attribute to <tt>find_by_</tt>, <tt>find_last_by_</tt>, or <tt>find_all_by_</tt>, so you get finders like <tt>Person.find_by_user_name</tt>,
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154 # <tt>Person.find_all_by_last_name</tt>, and <tt>Payment.find_by_transaction_id</tt>. So instead of writing
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155 # <tt>Person.find(:first, :conditions => ["user_name = ?", user_name])</tt>, you just do <tt>Person.find_by_user_name(user_name)</tt>.
156 # And instead of writing <tt>Person.find(:all, :conditions => ["last_name = ?", last_name])</tt>, you just do <tt>Person.find_all_by_last_name(last_name)</tt>.
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157 #
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158 # It's also possible to use multiple attributes in the same find by separating them with "_and_", so you get finders like
159 # <tt>Person.find_by_user_name_and_password</tt> or even <tt>Payment.find_by_purchaser_and_state_and_country</tt>. So instead of writing
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160 # <tt>Person.find(:first, :conditions => ["user_name = ? AND password = ?", user_name, password])</tt>, you just do
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161 # <tt>Person.find_by_user_name_and_password(user_name, password)</tt>.
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162 #
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163 # It's even possible to use all the additional parameters to find. For example, the full interface for <tt>Payment.find_all_by_amount</tt>
164 # is actually <tt>Payment.find_all_by_amount(amount, options)</tt>. And the full interface to <tt>Person.find_by_user_name</tt> is
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165 # actually <tt>Person.find_by_user_name(user_name, options)</tt>. So you could call <tt>Payment.find_all_by_amount(50, :order => "created_on")</tt>.
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166 # Also you may call <tt>Payment.find_last_by_amount(amount, options)</tt> returning the last record matching that amount and options.
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167 #
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168 # The same dynamic finder style can be used to create the object if it doesn't already exist. This dynamic finder is called with
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169 # <tt>find_or_create_by_</tt> and will return the object if it already exists and otherwise creates it, then returns it. Protected attributes won't be set unless they are given in a block. For example:
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170 #
171 # # No 'Summer' tag exists
172 # Tag.find_or_create_by_name("Summer") # equal to Tag.create(:name => "Summer")
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173 #
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174 # # Now the 'Summer' tag does exist
175 # Tag.find_or_create_by_name("Summer") # equal to Tag.find_by_name("Summer")
176 #
c10b225 @dhh Fixed that ActiveRecord#Base.find_or_create/initialize would not honor a...
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177 # # Now 'Bob' exist and is an 'admin'
178 # User.find_or_create_by_name('Bob', :age => 40) { |u| u.admin = true }
179 #
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180 # Use the <tt>find_or_initialize_by_</tt> finder if you want to return a new record without saving it first. Protected attributes won't be set unless they are given in a block. For example:
d19e464 @sstephenson Added find_or_initialize_by_X which works like find_or_create_by_X but d...
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181 #
182 # # No 'Winter' tag exists
183 # winter = Tag.find_or_initialize_by_name("Winter")
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184 # winter.new_record? # true
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185 #
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186 # To find by a subset of the attributes to be used for instantiating a new object, pass a hash instead of
187 # a list of parameters. For example:
188 #
189 # Tag.find_or_create_by_name(:name => "rails", :creator => current_user)
190 #
191 # That will either find an existing tag named "rails", or create a new one while setting the user that created it.
192 #
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193 # == Saving arrays, hashes, and other non-mappable objects in text columns
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194 #
195 # Active Record can serialize any object in text columns using YAML. To do so, you must specify this with a call to the class method +serialize+.
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196 # This makes it possible to store arrays, hashes, and other non-mappable objects without doing any additional work. Example:
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197 #
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198 # class User < ActiveRecord::Base
199 # serialize :preferences
200 # end
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201 #
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202 # user = User.create(:preferences => { "background" => "black", "display" => large })
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203 # User.find(user.id).preferences # => { "background" => "black", "display" => large }
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204 #
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205 # You can also specify a class option as the second parameter that'll raise an exception if a serialized object is retrieved as a
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206 # descendant of a class not in the hierarchy. Example:
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207 #
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208 # class User < ActiveRecord::Base
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209 # serialize :preferences, Hash
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210 # end
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211 #
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212 # user = User.create(:preferences => %w( one two three ))
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213 # User.find(user.id).preferences # raises SerializationTypeMismatch
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214 #
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215 # == Single table inheritance
216 #
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217 # Active Record allows inheritance by storing the name of the class in a column that by default is named "type" (can be changed
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218 # by overwriting <tt>Base.inheritance_column</tt>). This means that an inheritance looking like this:
219 #
220 # class Company < ActiveRecord::Base; end
221 # class Firm < Company; end
222 # class Client < Company; end
223 # class PriorityClient < Client; end
224 #
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225 # When you do <tt>Firm.create(:name => "37signals")</tt>, this record will be saved in the companies table with type = "Firm". You can then
226 # fetch this row again using <tt>Company.find(:first, "name = '37signals'")</tt> and it will return a Firm object.
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227 #
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228 # If you don't have a type column defined in your table, single-table inheritance won't be triggered. In that case, it'll work just
229 # like normal subclasses with no special magic for differentiating between them or reloading the right type with find.
230 #
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231 # Note, all the attributes for all the cases are kept in the same table. Read more:
232 # http://www.martinfowler.com/eaaCatalog/singleTableInheritance.html
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233 #
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234 # == Connection to multiple databases in different models
235 #
236 # Connections are usually created through ActiveRecord::Base.establish_connection and retrieved by ActiveRecord::Base.connection.
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237 # All classes inheriting from ActiveRecord::Base will use this connection. But you can also set a class-specific connection.
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238 # For example, if Course is an ActiveRecord::Base, but resides in a different database, you can just say <tt>Course.establish_connection</tt>
239 # and Course and all of its subclasses will use this connection instead.
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240 #
241 # This feature is implemented by keeping a connection pool in ActiveRecord::Base that is a Hash indexed by the class. If a connection is
242 # requested, the retrieve_connection method will go up the class-hierarchy until a connection is found in the connection pool.
243 #
244 # == Exceptions
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245 #
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246 # * ActiveRecordError - Generic error class and superclass of all other errors raised by Active Record.
247 # * AdapterNotSpecified - The configuration hash used in <tt>establish_connection</tt> didn't include an
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248 # <tt>:adapter</tt> key.
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249 # * AdapterNotFound - The <tt>:adapter</tt> key used in <tt>establish_connection</tt> specified a non-existent adapter
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250 # (or a bad spelling of an existing one).
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251 # * AssociationTypeMismatch - The object assigned to the association wasn't of the type specified in the association definition.
252 # * SerializationTypeMismatch - The serialized object wasn't of the class specified as the second parameter.
253 # * ConnectionNotEstablished+ - No connection has been established. Use <tt>establish_connection</tt> before querying.
254 # * RecordNotFound - No record responded to the +find+ method. Either the row with the given ID doesn't exist
255 # or the row didn't meet the additional restrictions. Some +find+ calls do not raise this exception to signal
256 # nothing was found, please check its documentation for further details.
257 # * StatementInvalid - The database server rejected the SQL statement. The precise error is added in the message.
258 # * MultiparameterAssignmentErrors - Collection of errors that occurred during a mass assignment using the
259 # <tt>attributes=</tt> method. The +errors+ property of this exception contains an array of AttributeAssignmentError
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260 # objects that should be inspected to determine which attributes triggered the errors.
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261 # * AttributeAssignmentError - An error occurred while doing a mass assignment through the <tt>attributes=</tt> method.
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262 # You can inspect the +attribute+ property of the exception object to determine which attribute triggered the error.
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263 #
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264 # *Note*: The attributes listed are class-level attributes (accessible from both the class and instance level).
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265 # So it's possible to assign a logger to the class through <tt>Base.logger=</tt> which will then be used by all
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266 # instances in the current object space.
267 class Base
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268 ##
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269 # :singleton-method:
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270 # Accepts a logger conforming to the interface of Log4r or the default Ruby 1.8+ Logger class, which is then passed
271 # on to any new database connections made and which can be retrieved on both a class and instance level by calling +logger+.
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272 cattr_accessor :logger, :instance_writer => false
e694114 @jeremy Deprecation: removed Reloadable.
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273
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274 def self.inherited(child) #:nodoc:
275 @@subclasses[self] ||= []
276 @@subclasses[self] << child
277 super
278 end
e694114 @jeremy Deprecation: removed Reloadable.
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279
fed7d33 @dhh Fixed documentation
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280 def self.reset_subclasses #:nodoc:
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281 nonreloadables = []
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282 subclasses.each do |klass|
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283 unless ActiveSupport::Dependencies.autoloaded? klass
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284 nonreloadables << klass
285 next
286 end
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287 klass.instance_variables.each { |var| klass.send(:remove_instance_variable, var) }
288 klass.instance_methods(false).each { |m| klass.send :undef_method, m }
289 end
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290 @@subclasses = {}
291 nonreloadables.each { |klass| (@@subclasses[klass.superclass] ||= []) << klass }
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292 end
293
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294 @@subclasses = {}
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295
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296 ##
297 # :singleton-method:
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298 # Contains the database configuration - as is typically stored in config/database.yml -
299 # as a Hash.
300 #
301 # For example, the following database.yml...
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302 #
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303 # development:
304 # adapter: sqlite3
305 # database: db/development.sqlite3
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306 #
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307 # production:
308 # adapter: sqlite3
309 # database: db/production.sqlite3
310 #
311 # ...would result in ActiveRecord::Base.configurations to look like this:
312 #
313 # {
314 # 'development' => {
315 # 'adapter' => 'sqlite3',
316 # 'database' => 'db/development.sqlite3'
317 # },
318 # 'production' => {
319 # 'adapter' => 'sqlite3',
320 # 'database' => 'db/production.sqlite3'
321 # }
322 # }
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323 cattr_accessor :configurations, :instance_writer => false
c4a3634 @jeremy Corrected @@configurations typo. #1410 [david@ruppconsulting.com]
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324 @@configurations = {}
325
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326 ##
327 # :singleton-method:
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328 # Accessor for the prefix type that will be prepended to every primary key column name. The options are :table_name and
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329 # :table_name_with_underscore. If the first is specified, the Product class will look for "productid" instead of "id" as
330 # the primary column. If the latter is specified, the Product class will look for "product_id" instead of "id". Remember
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331 # that this is a global setting for all Active Records.
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332 cattr_accessor :primary_key_prefix_type, :instance_writer => false
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333 @@primary_key_prefix_type = nil
334
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335 ##
336 # :singleton-method:
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337 # Accessor for the name of the prefix string to prepend to every table name. So if set to "basecamp_", all
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338 # table names will be named like "basecamp_projects", "basecamp_people", etc. This is a convenient way of creating a namespace
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339 # for tables in a shared database. By default, the prefix is the empty string.
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340 cattr_accessor :table_name_prefix, :instance_writer => false
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341 @@table_name_prefix = ""
342
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343 ##
344 # :singleton-method:
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345 # Works like +table_name_prefix+, but appends instead of prepends (set to "_basecamp" gives "projects_basecamp",
346 # "people_basecamp"). By default, the suffix is the empty string.
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347 cattr_accessor :table_name_suffix, :instance_writer => false
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348 @@table_name_suffix = ""
349
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350 ##
351 # :singleton-method:
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352 # Indicates whether table names should be the pluralized versions of the corresponding class names.
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353 # If true, the default table name for a Product class will be +products+. If false, it would just be +product+.
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354 # See table_name for the full rules on table/class naming. This is true, by default.
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355 cattr_accessor :pluralize_table_names, :instance_writer => false
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356 @@pluralize_table_names = true
357
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358 ##
359 # :singleton-method:
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360 # Determines whether to use Time.local (using :local) or Time.utc (using :utc) when pulling dates and times from the database.
361 # This is set to :local by default.
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362 cattr_accessor :default_timezone, :instance_writer => false
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363 @@default_timezone = :local
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364
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365 ##
366 # :singleton-method:
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367 # Specifies the format to use when dumping the database schema with Rails'
368 # Rakefile. If :sql, the schema is dumped as (potentially database-
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369 # specific) SQL statements. If :ruby, the schema is dumped as an
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370 # ActiveRecord::Schema file which can be loaded into any database that
371 # supports migrations. Use :ruby if you want to have different database
372 # adapters for, e.g., your development and test environments.
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373 cattr_accessor :schema_format , :instance_writer => false
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374 @@schema_format = :ruby
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375
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376 ##
377 # :singleton-method:
bbab639 @nikz Set config.active_record.timestamped_migrations = false to have migratio...
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378 # Specify whether or not to use timestamps for migration numbers
379 cattr_accessor :timestamped_migrations , :instance_writer => false
380 @@timestamped_migrations = true
381
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382 # Determine whether to store the full constant name including namespace when using STI
383 superclass_delegating_accessor :store_full_sti_class
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384 self.store_full_sti_class = true
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385
2530d0e @lifo Added default_scope to Base [#1381 state:committed] (Paweł Kondzior)
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386 # Stores the default scope for the class
387 class_inheritable_accessor :default_scoping, :instance_writer => false
388 self.default_scoping = []
389
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390 class << self # Class methods
8d78a82 @josevalim Deprecate ActiveRecord::Base.colorize_logging.
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391 def colorize_logging(*args)
392 ActiveSupport::Deprecation.warn "ActiveRecord::Base.colorize_logging and " <<
39d6f9e @wycats Make many parts of Rails lazy. In order to facilitate this,
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393 "config.active_record.colorize_logging are deprecated. Please use " <<
f0523f7 @sikachu Rename Rails::Subscriber to Rails::LogSubscriber
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394 "Rails::LogSubscriber.colorize_logging or config.colorize_logging instead", caller
8d78a82 @josevalim Deprecate ActiveRecord::Base.colorize_logging.
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395 end
396 alias :colorize_logging= :colorize_logging
397
8d31c9f @lifo Move update and update_all to Relation
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398 delegate :find, :first, :last, :all, :destroy, :destroy_all, :exists?, :delete, :delete_all, :update, :update_all, :to => :scoped
dc3cc6c @lifo Move batch finders to Relation
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399 delegate :find_each, :find_in_batches, :to => :scoped
6f5f23a @lifo Add Relation#includes to be an equivalent of current finder option :incl...
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400 delegate :select, :group, :order, :limit, :joins, :where, :preload, :eager_load, :includes, :from, :lock, :readonly, :having, :to => :scoped
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401 delegate :count, :average, :minimum, :maximum, :sum, :calculate, :to => :scoped
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402
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403 # Executes a custom SQL query against your database and returns all the results. The results will
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404 # be returned as an array with columns requested encapsulated as attributes of the model you call
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405 # this method from. If you call <tt>Product.find_by_sql</tt> then the results will be returned in
406 # a Product object with the attributes you specified in the SQL query.
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407 #
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408 # If you call a complicated SQL query which spans multiple tables the columns specified by the
409 # SELECT will be attributes of the model, whether or not they are columns of the corresponding
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410 # table.
411 #
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412 # The +sql+ parameter is a full SQL query as a string. It will be called as is, there will be
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413 # no database agnostic conversions performed. This should be a last resort because using, for example,
414 # MySQL specific terms will lock you to using that particular database engine or require you to
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415 # change your call if you switch engines.
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416 #
417 # ==== Examples
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418 # # A simple SQL query spanning multiple tables
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419 # Post.find_by_sql "SELECT p.title, c.author FROM posts p, comments c WHERE p.id = c.post_id"
420 # > [#<Post:0x36bff9c @attributes={"title"=>"Ruby Meetup", "first_name"=>"Quentin"}>, ...]
421 #
422 # # You can use the same string replacement techniques as you can with ActiveRecord#find
423 # Post.find_by_sql ["SELECT title FROM posts WHERE author = ? AND created > ?", author_id, start_date]
424 # > [#<Post:0x36bff9c @attributes={"first_name"=>"The Cheap Man Buys Twice"}>, ...]
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425 def find_by_sql(sql)
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426 connection.select_all(sanitize_sql(sql), "#{name} Load").collect! { |record| instantiate(record) }
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427 end
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428
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429 # Creates an object (or multiple objects) and saves it to the database, if validations pass.
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430 # The resulting object is returned whether the object was saved successfully to the database or not.
431 #
432 # The +attributes+ parameter can be either be a Hash or an Array of Hashes. These Hashes describe the
433 # attributes on the objects that are to be created.
434 #
435 # ==== Examples
436 # # Create a single new object
437 # User.create(:first_name => 'Jamie')
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438 #
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439 # # Create an Array of new objects
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440 # User.create([{ :first_name => 'Jamie' }, { :first_name => 'Jeremy' }])
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441 #
442 # # Create a single object and pass it into a block to set other attributes.
443 # User.create(:first_name => 'Jamie') do |u|
444 # u.is_admin = false
445 # end
446 #
447 # # Creating an Array of new objects using a block, where the block is executed for each object:
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448 # User.create([{ :first_name => 'Jamie' }, { :first_name => 'Jeremy' }]) do |u|
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449 # u.is_admin = false
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450 # end
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451 def create(attributes = nil, &block)
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452 if attributes.is_a?(Array)
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453 attributes.collect { |attr| create(attr, &block) }
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454 else
455 object = new(attributes)
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456 yield(object) if block_given?
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457 object.save
458 object
459 end
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460 end
461
462 # Returns the result of an SQL statement that should only include a COUNT(*) in the SELECT part.
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463 # The use of this method should be restricted to complicated SQL queries that can't be executed
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464 # using the ActiveRecord::Calculations class methods. Look into those before using this.
465 #
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466 # ==== Parameters
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467 #
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468 # * +sql+ - An SQL statement which should return a count query from the database, see the example below.
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469 #
470 # ==== Examples
471 #
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472 # Product.count_by_sql "SELECT COUNT(*) FROM sales s, customers c WHERE s.customer_id = c.id"
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473 def count_by_sql(sql)
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474 sql = sanitize_conditions(sql)
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475 connection.select_value(sql, "#{name} Count").to_i
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476 end
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477
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478 # Resets one or more counter caches to their correct value using an SQL
479 # count query. This is useful when adding new counter caches, or if the
480 # counter has been corrupted or modified directly by SQL.
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481 #
482 # ==== Parameters
483 #
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484 # * +id+ - The id of the object you wish to reset a counter on.
485 # * +counters+ - One or more counter names to reset
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486 #
487 # ==== Examples
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488 #
489 # # For Post with id #1 records reset the comments_count
490 # Post.reset_counters(1, :comments)
491 def reset_counters(id, *counters)
492 object = find(id)
493 counters.each do |association|
494 child_class = reflect_on_association(association).klass
495 counter_name = child_class.reflect_on_association(self.name.downcase.to_sym).counter_cache_column
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496
497 connection.update("UPDATE #{quoted_table_name} SET #{connection.quote_column_name(counter_name)} = #{object.send(association).count} WHERE #{connection.quote_column_name(primary_key)} = #{quote_value(object.id)}", "#{name} UPDATE")
498 end
499 end
500
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501 # A generic "counter updater" implementation, intended primarily to be
502 # used by increment_counter and decrement_counter, but which may also
503 # be useful on its own. It simply does a direct SQL update for the record
504 # with the given ID, altering the given hash of counters by the amount
505 # given by the corresponding value:
506 #
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507 # ==== Parameters
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508 #
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509 # * +id+ - The id of the object you wish to update a counter on or an Array of ids.
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510 # * +counters+ - An Array of Hashes containing the names of the fields
511 # to update as keys and the amount to update the field by as values.
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512 #
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513 # ==== Examples
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514 #
515 # # For the Post with id of 5, decrement the comment_count by 1, and
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516 # # increment the action_count by 1
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517 # Post.update_counters 5, :comment_count => -1, :action_count => 1
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518 # # Executes the following SQL:
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519 # # UPDATE posts
520 # # SET comment_count = comment_count - 1,
521 # # action_count = action_count + 1
522 # # WHERE id = 5
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523 #
524 # # For the Posts with id of 10 and 15, increment the comment_count by 1
525 # Post.update_counters [10, 15], :comment_count => 1
526 # # Executes the following SQL:
527 # # UPDATE posts
528 # # SET comment_count = comment_count + 1,
529 # # WHERE id IN (10, 15)
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530 def update_counters(id, counters)
531 updates = counters.inject([]) { |list, (counter_name, increment)|
532 sign = increment < 0 ? "-" : "+"
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533 list << "#{connection.quote_column_name(counter_name)} = COALESCE(#{connection.quote_column_name(counter_name)}, 0) #{sign} #{increment.abs}"
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534 }.join(", ")
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535
536 if id.is_a?(Array)
537 ids_list = id.map {|i| quote_value(i)}.join(', ')
538 condition = "IN (#{ids_list})"
539 else
540 condition = "= #{quote_value(id)}"
541 end
542
543 update_all(updates, "#{connection.quote_column_name(primary_key)} #{condition}")
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544 end
545
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546 # Increment a number field by one, usually representing a count.
547 #
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548 # This is used for caching aggregate values, so that they don't need to be computed every time.
549 # For example, a DiscussionBoard may cache post_count and comment_count otherwise every time the board is
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550 # shown it would have to run an SQL query to find how many posts and comments there are.
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551 #
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552 # ==== Parameters
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553 #
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554 # * +counter_name+ - The name of the field that should be incremented.
555 # * +id+ - The id of the object that should be incremented.
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556 #
557 # ==== Examples
558 #
559 # # Increment the post_count column for the record with an id of 5
560 # DiscussionBoard.increment_counter(:post_count, 5)
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561 def increment_counter(counter_name, id)
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562 update_counters(id, counter_name => 1)
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563 end
564
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565 # Decrement a number field by one, usually representing a count.
566 #
567 # This works the same as increment_counter but reduces the column value by 1 instead of increasing it.
568 #
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569 # ==== Parameters
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570 #
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571 # * +counter_name+ - The name of the field that should be decremented.
572 # * +id+ - The id of the object that should be decremented.
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573 #
574 # ==== Examples
575 #
576 # # Decrement the post_count column for the record with an id of 5
577 # DiscussionBoard.decrement_counter(:post_count, 5)
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578 def decrement_counter(counter_name, id)
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579 update_counters(id, counter_name => -1)
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580 end
581
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582 # Attributes named in this macro are protected from mass-assignment,
583 # such as <tt>new(attributes)</tt>,
584 # <tt>update_attributes(attributes)</tt>, or
585 # <tt>attributes=(attributes)</tt>.
586 #
587 # Mass-assignment to these attributes will simply be ignored, to assign
588 # to them you can use direct writer methods. This is meant to protect
589 # sensitive attributes from being overwritten by malicious users
590 # tampering with URLs or forms.
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591 #
592 # class Customer < ActiveRecord::Base
593 # attr_protected :credit_rating
594 # end
595 #
596 # customer = Customer.new("name" => David, "credit_rating" => "Excellent")
597 # customer.credit_rating # => nil
598 # customer.attributes = { "description" => "Jolly fellow", "credit_rating" => "Superb" }
599 # customer.credit_rating # => nil
600 #
601 # customer.credit_rating = "Average"
602 # customer.credit_rating # => "Average"
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603 #
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604 # To start from an all-closed default and enable attributes as needed,
605 # have a look at +attr_accessible+.
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606 #
607 # If the access logic of your application is richer you can use <tt>Hash#except</tt>
608 # or <tt>Hash#slice</tt> to sanitize the hash of parameters before they are
609 # passed to Active Record.
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610 #
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611 # For example, it could be the case that the list of protected attributes
612 # for a given model depends on the role of the user:
613 #
614 # # Assumes plan_id is not protected because it depends on the role.
615 # params[:account] = params[:account].except(:plan_id) unless admin?
616 # @account.update_attributes(params[:account])
617 #
618 # Note that +attr_protected+ is still applied to the received hash. Thus,
619 # with this technique you can at most _extend_ the list of protected
620 # attributes for a particular mass-assignment call.
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621 def attr_protected(*attributes)
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622 write_inheritable_attribute(:attr_protected, Set.new(attributes.map {|a| a.to_s}) + (protected_attributes || []))
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623 end
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624
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625 # Returns an array of all the attributes that have been protected from mass-assignment.
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626 def protected_attributes # :nodoc:
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627 read_inheritable_attribute(:attr_protected)
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628 end
629
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630 # Specifies a white list of model attributes that can be set via
631 # mass-assignment, such as <tt>new(attributes)</tt>,
632 # <tt>update_attributes(attributes)</tt>, or
633 # <tt>attributes=(attributes)</tt>
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634 #
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635 # This is the opposite of the +attr_protected+ macro: Mass-assignment
636 # will only set attributes in this list, to assign to the rest of
637 # attributes you can use direct writer methods. This is meant to protect
638 # sensitive attributes from being overwritten by malicious users
639 # tampering with URLs or forms. If you'd rather start from an all-open
640 # default and restrict attributes as needed, have a look at
641 # +attr_protected+.
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642 #
643 # class Customer < ActiveRecord::Base
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644 # attr_accessible :name, :nickname
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645 # end
646 #
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647 # customer = Customer.new(:name => "David", :nickname => "Dave", :credit_rating => "Excellent")
648 # customer.credit_rating # => nil
649 # customer.attributes = { :name => "Jolly fellow", :credit_rating => "Superb" }
650 # customer.credit_rating # => nil
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651 #
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652 # customer.credit_rating = "Average"
653 # customer.credit_rating # => "Average"
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654 #
655 # If the access logic of your application is richer you can use <tt>Hash#except</tt>
656 # or <tt>Hash#slice</tt> to sanitize the hash of parameters before they are
657 # passed to Active Record.
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658 #
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659 # For example, it could be the case that the list of accessible attributes
660 # for a given model depends on the role of the user:
661 #
662 # # Assumes plan_id is accessible because it depends on the role.
663 # params[:account] = params[:account].except(:plan_id) unless admin?
664 # @account.update_attributes(params[:account])
665 #
666 # Note that +attr_accessible+ is still applied to the received hash. Thus,
667 # with this technique you can at most _narrow_ the list of accessible
668 # attributes for a particular mass-assignment call.
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669 def attr_accessible(*attributes)
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670 write_inheritable_attribute(:attr_accessible, Set.new(attributes.map(&:to_s)) + (accessible_attributes || []))
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671 end
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672
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673 # Returns an array of all the attributes that have been made accessible to mass-assignment.
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674 def accessible_attributes # :nodoc:
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675 read_inheritable_attribute(:attr_accessible)
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676 end
677
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678 # Attributes listed as readonly can be set for a new record, but will be ignored in database updates afterwards.
679 def attr_readonly(*attributes)
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680 write_inheritable_attribute(:attr_readonly, Set.new(attributes.map(&:to_s)) + (readonly_attributes || []))
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681 end
682
683 # Returns an array of all the attributes that have been specified as readonly.
684 def readonly_attributes
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685 read_inheritable_attribute(:attr_readonly) || []
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686 end
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687
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688 # If you have an attribute that needs to be saved to the database as an object, and retrieved as the same object,
689 # then specify the name of that attribute using this method and it will be handled automatically.
690 # The serialization is done through YAML. If +class_name+ is specified, the serialized object must be of that
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691 # class on retrieval or SerializationTypeMismatch will be raised.
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692 #
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693 # ==== Parameters
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694 #
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695 # * +attr_name+ - The field name that should be serialized.
696 # * +class_name+ - Optional, class name that the object type should be equal to.
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697 #
698 # ==== Example
699 # # Serialize a preferences attribute
700 # class User
701 # serialize :preferences
702 # end
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703 def serialize(attr_name, class_name = Object)
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704 serialized_attributes[attr_name.to_s] = class_name
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705 end
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706
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707 # Returns a hash of all the attributes that have been specified for serialization as keys and their class restriction as values.
708 def serialized_attributes
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709 read_inheritable_attribute(:attr_serialized) or write_inheritable_attribute(:attr_serialized, {})
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710 end
711
712 # Guesses the table name (in forced lower-case) based on the name of the class in the inheritance hierarchy descending
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713 # directly from ActiveRecord::Base. So if the hierarchy looks like: Reply < Message < ActiveRecord::Base, then Message is used
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714 # to guess the table name even when called on Reply. The rules used to do the guess are handled by the Inflector class
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715 # in Active Support, which knows almost all common English inflections. You can add new inflections in config/initializers/inflections.rb.
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716 #
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717 # Nested classes are given table names prefixed by the singular form of
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718 # the parent's table name. Enclosing modules are not considered.
719 #
720 # ==== Examples
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721 #
722 # class Invoice < ActiveRecord::Base; end;
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723 # file class table_name
724 # invoice.rb Invoice invoices
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725 #
726 # class Invoice < ActiveRecord::Base; class Lineitem < ActiveRecord::Base; end; end;
727 # file class table_name
728 # invoice.rb Invoice::Lineitem invoice_lineitems
729 #
730 # module Invoice; class Lineitem < ActiveRecord::Base; end; end;
731 # file class table_name
732 # invoice/lineitem.rb Invoice::Lineitem lineitems
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733 #
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734 # Additionally, the class-level +table_name_prefix+ is prepended and the
735 # +table_name_suffix+ is appended. So if you have "myapp_" as a prefix,
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736 # the table name guess for an Invoice class becomes "myapp_invoices".
737 # Invoice::Lineitem becomes "myapp_invoice_lineitems".
738 #
739 # You can also overwrite this class method to allow for unguessable
740 # links, such as a Mouse class with a link to a "mice" table. Example:
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741 #
742 # class Mouse < ActiveRecord::Base
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743 # set_table_name "mice"
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744 # end
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745 def table_name
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746 reset_table_name
747 end
748
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749 def quoted_table_name
750 @quoted_table_name ||= connection.quote_table_name(table_name)
751 end
752
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753 def reset_table_name #:nodoc:
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754 base = base_class
755
756 name =
757 # STI subclasses always use their superclass' table.
758 unless self == base
759 base.table_name
760 else
761 # Nested classes are prefixed with singular parent table name.
762 if parent < ActiveRecord::Base && !parent.abstract_class?
763 contained = parent.table_name
764 contained = contained.singularize if parent.pluralize_table_names
765 contained << '_'
766 end
767 name = "#{table_name_prefix}#{contained}#{undecorated_table_name(base.name)}#{table_name_suffix}"
768 end
769
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770 @quoted_table_name = nil
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771 set_table_name(name)
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772 name
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773 end
774
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775 # Defines the column name for use with single table inheritance
776 # -- can be set in subclasses like so: self.inheritance_column = "type_id"
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777 def inheritance_column
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778 @inheritance_column ||= "type".freeze
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779 end
780
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781 # Lazy-set the sequence name to the connection's default. This method
782 # is only ever called once since set_sequence_name overrides it.
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783 def sequence_name #:nodoc:
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784 reset_sequence_name
785 end
786
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787 def reset_sequence_name #:nodoc:
7c8f3ed @jeremy r4325@asus: jeremy | 2005-11-12 03:57:46 -0800
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788 default = connection.default_sequence_name(table_name, primary_key)
789 set_sequence_name(default)
790 default
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791 end
792
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793 # Sets the table name to use to the given value, or (if the value
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794 # is nil or false) to the value returned by the given block.
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795 #
796 # class Project < ActiveRecord::Base
797 # set_table_name "project"
798 # end
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799 def set_table_name(value = nil, &block)
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800 define_attr_method :table_name, value, &block
801 end
802 alias :table_name= :set_table_name
803
804 # Sets the name of the inheritance column to use to the given value,
805 # or (if the value # is nil or false) to the value returned by the
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806 # given block.
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807 #
808 # class Project < ActiveRecord::Base
809 # set_inheritance_column do
810 # original_inheritance_column + "_id"
811 # end
812 # end
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813 def set_inheritance_column(value = nil, &block)
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814 define_attr_method :inheritance_column, value, &block
815 end
816 alias :inheritance_column= :set_inheritance_column
817
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818 # Sets the name of the sequence to use when generating ids to the given
819 # value, or (if the value is nil or false) to the value returned by the
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820 # given block. This is required for Oracle and is useful for any
821 # database which relies on sequences for primary key generation.
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822 #
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823 # If a sequence name is not explicitly set when using Oracle or Firebird,
824 # it will default to the commonly used pattern of: #{table_name}_seq
825 #
826 # If a sequence name is not explicitly set when using PostgreSQL, it
827 # will discover the sequence corresponding to your primary key for you.
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828 #
829 # class Project < ActiveRecord::Base
830 # set_sequence_name "projectseq" # default would have been "project_seq"
831 # end
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832 def set_sequence_name(value = nil, &block)
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833 define_attr_method :sequence_name, value, &block
834 end
835 alias :sequence_name= :set_sequence_name
836
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837 # Turns the +table_name+ back into a class name following the reverse rules of +table_name+.
838 def class_name(table_name = table_name) # :nodoc:
839 # remove any prefix and/or suffix from the table name
81737fc @jeremy r1613@asus: jeremy | 2005-07-03 07:04:53 -0700
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840 class_name = table_name[table_name_prefix.length..-(table_name_suffix.length + 1)].camelize
841 class_name = class_name.singularize if pluralize_table_names
842 class_name
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843 end
844
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845 # Indicates whether the table associated with this class exists
846 def table_exists?
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847 connection.table_exists?(table_name)
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848 end
849
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850 # Returns an array of column objects for the table associated with this class.
851 def columns
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852 unless defined?(@columns) && @columns
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853 @columns = connection.columns(table_name, "#{name} Columns")
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854 @columns.each { |column| column.primary = column.name == primary_key }
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855 end
856 @columns
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857 end
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858
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NZKoz authored
859 # Returns a hash of column objects for the table associated with this class.
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860 def columns_hash
861 @columns_hash ||= columns.inject({}) { |hash, column| hash[column.name] = column; hash }
862 end
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863
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864 # Returns an array of column names as strings.
49d0f0c @dhh Speeded up eager loading a whole bunch
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865 def column_names
d0bd3b5 @jeremy Return PostgreSQL columns in the order they are declared #1374 (perlguy@...
jeremy authored
866 @column_names ||= columns.map { |column| column.name }
49d0f0c @dhh Speeded up eager loading a whole bunch
dhh authored
867 end
db045db @dhh Initial
dhh authored
868
2948910 Misc doc fixes (typos/grammar/etc.). Closes #2430.
Marcel Molina authored
869 # Returns an array of column objects where the primary id, all columns ending in "_id" or "_count",
870 # and columns used for single table inheritance have been removed.
db045db @dhh Initial
dhh authored
871 def content_columns
c0899bc Add convenience predicate methods on Column class. In partial fullfilmen...
Marcel Molina authored
872 @content_columns ||= columns.reject { |c| c.primary || c.name =~ /(_id|_count)$/ || c.name == inheritance_column }
db045db @dhh Initial
dhh authored
873 end
874
875 # Returns a hash of all the methods added to query each of the columns in the table with the name of the method as the key
876 # and true as the value. This makes it possible to do O(1) lookups in respond_to? to check if a given method for attribute
6e39c9e @jeremy r1614@asus: jeremy | 2005-07-03 08:01:08 -0700
jeremy authored
877 # is available.
fed7d33 @dhh Fixed documentation
dhh authored
878 def column_methods_hash #:nodoc:
d0bd3b5 @jeremy Return PostgreSQL columns in the order they are declared #1374 (perlguy@...
jeremy authored
879 @dynamic_methods_hash ||= column_names.inject(Hash.new(false)) do |methods, attr|
3ab3a70 @jeremy Clarify semantics of ActiveRecord::Base#respond_to? Closes #2560.
jeremy authored
880 attr_name = attr.to_s
881 methods[attr.to_sym] = attr_name
882 methods["#{attr}=".to_sym] = attr_name
883 methods["#{attr}?".to_sym] = attr_name
884 methods["#{attr}_before_type_cast".to_sym] = attr_name
db045db @dhh Initial
dhh authored
885 methods
886 end
887 end
6e39c9e @jeremy r1614@asus: jeremy | 2005-07-03 08:01:08 -0700
jeremy authored
888
a293278 @lifo Merge docrails
lifo authored
889 # Resets all the cached information about columns, which will cause them
890 # to be reloaded on the next request.
891 #
892 # The most common usage pattern for this method is probably in a migration,
893 # when just after creating a table you want to populate it with some default
894 # values, eg:
895 #
896 # class CreateJobLevels < ActiveRecord::Migration
897 # def self.up
898 # create_table :job_levels do |t|
899 # t.integer :id
900 # t.string :name
901 #
902 # t.timestamps
903 # end
904 #
905 # JobLevel.reset_column_information
906 # %w{assistant executive manager director}.each do |type|
907 # JobLevel.create(:name => type)
908 # end
909 # end
910 #
911 # def self.down
912 # drop_table :job_levels
913 # end
914 # end
1314f48 @dhh Added methods for resetting the cached information on classes that you w...
dhh authored
915 def reset_column_information
e129c56 @josh Wrap up attribute method reset concerns in 'undefine_attribute_methods'
josh authored
916 undefine_attribute_methods
d2c4b3b @lifo Rename Model.engine to active_relation_engine. Cache arel_table and the ...
lifo authored
917 @column_names = @columns = @columns_hash = @content_columns = @dynamic_methods_hash = @inheritance_column = nil
6e3bee6 @lifo Cache Model.arel_table
lifo authored
918 @arel_engine = @unscoped = @arel_table = nil
1314f48 @dhh Added methods for resetting the cached information on classes that you w...
dhh authored
919 end
920
4eab375 @dhh Finished polishing API docs
dhh authored
921 def reset_column_information_and_inheritable_attributes_for_all_subclasses#:nodoc:
1314f48 @dhh Added methods for resetting the cached information on classes that you w...
dhh authored
922 subclasses.each { |klass| klass.reset_inheritable_attributes; klass.reset_column_information }
923 end
db045db @dhh Initial
dhh authored
924
e714b49 @josevalim Move validator, human_name and human_attribute_name to ActiveModel, remo...
josevalim authored
925 # Set the lookup ancestors for ActiveModel.
926 def lookup_ancestors #:nodoc:
ffeab4e Cleaned up ActiveRecord i18n scoping
Iain Hecker authored
927 klass = self
928 classes = [klass]
0905396 @miloops construct_finder_sql now use Arel
miloops authored
929 while klass != klass.base_class
ffeab4e Cleaned up ActiveRecord i18n scoping
Iain Hecker authored
930 classes << klass = klass.superclass
931 end
932 classes
933 rescue
934 # OPTIMIZE this rescue is to fix this test: ./test/cases/reflection_test.rb:56:in `test_human_name_for_column'
e033b5d @lifo Merge docrails
lifo authored
935 # Apparently the method base_class causes some trouble.
ffeab4e Cleaned up ActiveRecord i18n scoping
Iain Hecker authored
936 # It now works for sure.
937 [self]
938 end
939
e714b49 @josevalim Move validator, human_name and human_attribute_name to ActiveModel, remo...
josevalim authored
940 # Set the i18n scope to overwrite ActiveModel.
941 def i18n_scope #:nodoc:
942 :activerecord
db045db @dhh Initial
dhh authored
943 end
6e39c9e @jeremy r1614@asus: jeremy | 2005-07-03 08:01:08 -0700
jeremy authored
944
06afb8c @jeremy Subclasses of an abstract class work with single-table inheritance. Refe...
jeremy authored
945 # True if this isn't a concrete subclass needing a STI type condition.
946 def descends_from_active_record?
947 if superclass.abstract_class?
948 superclass.descends_from_active_record?
949 else
950 superclass == Base || !columns_hash.include?(inheritance_column)
951 end
db045db @dhh Initial
dhh authored
952 end
953
b4ec990 @NZKoz Cache the descends_from_activerecord? call to speed up query generation....
NZKoz authored
954 def finder_needs_type_condition? #:nodoc:
955 # This is like this because benchmarking justifies the strange :false stuff
956 :true == (@finder_needs_type_condition ||= descends_from_active_record? ? :false : :true)
957 end
958
d0360a4 @jeremy Base.inspect handles Base itself and abstract_class? Don't use #<Foo .....
jeremy authored
959 # Returns a string like 'Post id:integer, title:string, body:text'
52a9e50 @dhh Added ActiveRecord::Base.inspect to return a column-view like #<Post id:...
dhh authored
960 def inspect
d0360a4 @jeremy Base.inspect handles Base itself and abstract_class? Don't use #<Foo .....
jeremy authored
961 if self == Base
962 super
963 elsif abstract_class?
964 "#{super}(abstract)"
bb94ce9 @NZKoz Let inspect on AR classes work when the table doesn't exist. Closes #919...
NZKoz authored
965 elsif table_exists?
d0360a4 @jeremy Base.inspect handles Base itself and abstract_class? Don't use #<Foo .....
jeremy authored
966 attr_list = columns.map { |c| "#{c.name}: #{c.type}" } * ', '
967 "#{super}(#{attr_list})"
bb94ce9 @NZKoz Let inspect on AR classes work when the table doesn't exist. Closes #919...
NZKoz authored
968 else
969 "#{super}(Table doesn't exist)"
d0360a4 @jeremy Base.inspect handles Base itself and abstract_class? Don't use #<Foo .....
jeremy authored
970 end
52a9e50 @dhh Added ActiveRecord::Base.inspect to return a column-view like #<Post id:...
dhh authored
971 end
972
b445ab9 @NZKoz Rename quote to quote_value so the name can be used in AR models. #3628 ...
NZKoz authored
973 def quote_value(value, column = nil) #:nodoc:
b2c0ddf Add support for FrontBase (http://www.frontbase.com/) with a new adapter...
Marcel Molina authored
974 connection.quote(value,column)
4940383 @dhh Fixed value quoting in all generated SQL statements, so that integers ar...
dhh authored
975 end
976
7143d80 Smattering of grammatical fixes to documentation. Closes #10083 [BobSilv...
Marcel Molina authored
977 # Used to sanitize objects before they're used in an SQL SELECT statement. Delegates to <tt>connection.quote</tt>.
4eab375 @dhh Finished polishing API docs
dhh authored
978 def sanitize(object) #:nodoc:
4940383 @dhh Fixed value quoting in all generated SQL statements, so that integers ar...
dhh authored
979 connection.quote(object)
db045db @dhh Initial
dhh authored
980 end
981
97849de @dhh Fixed that association proxies would fail === tests like PremiumSubscrip...
dhh authored
982 # Overwrite the default class equality method to provide support for association proxies.
983 def ===(object)
984 object.is_a?(self)
7367325 @jeremy Document Active Record exceptions. Closes #10444.
jeremy authored
985 end
b840e4e Deprecated ActiveRecord::Base.threaded_connection in favor of ActiveReco...
Marcel Molina authored
986
d2f4750 @jamis Add AR::Base.base_class for querying the ancestor AR::Base subclass [Jam...
jamis authored
987 # Returns the base AR subclass that this class descends from. If A
988 # extends AR::Base, A.base_class will return A. If B descends from A
989 # through some arbitrarily deep hierarchy, B.base_class will return A.
990 def base_class
991 class_of_active_record_descendant(self)
992 end
993
98dc582 @lifo Merge docrails.
lifo authored
994 # Set this to true if this is an abstract class (see <tt>abstract_class?</tt>).
def7460 @technoweenie Added Base.abstract_class? that marks which classes are not part of the ...
technoweenie authored
995 attr_accessor :abstract_class
996
997 # Returns whether this class is a base AR class. If A is a base class and
998 # B descends from A, then B.base_class will return B.
999 def abstract_class?
8b5f4e4 @jeremy Ruby 1.9 compat: fix warnings, shadowed block vars, and unitialized inst...
jeremy authored
1000 defined?(@abstract_class) && @abstract_class == true
def7460 @technoweenie Added Base.abstract_class? that marks which classes are not part of the ...
technoweenie authored
1001 end
1002
4f39382 @lifo Ensure that respond_to? considers dynamic finder methods. Closes #11538....
lifo authored
1003 def respond_to?(method_id, include_private = false)
143f5fb @joshsusser refactor dynamic finder name matching into its own class
joshsusser authored
1004 if match = DynamicFinderMatch.match(method_id)
1005 return true if all_attributes_exists?(match.attribute_names)
66ee589 @yaroslav Introduce dynamic scopes for ActiveRecord: you can now use class methods...
yaroslav authored
1006 elsif match = DynamicScopeMatch.match(method_id)
1007 return true if all_attributes_exists?(match.attribute_names)
4f39382 @lifo Ensure that respond_to? considers dynamic finder methods. Closes #11538....
lifo authored
1008 end
c3aa2bc @Manfred Ensure nested with_scope merges conditions inside out [#2193 state:resol...
Manfred authored
1009
4f39382 @lifo Ensure that respond_to? considers dynamic finder methods. Closes #11538....
lifo authored
1010 super
1011 end
1012
72483c0 @technoweenie Add ActiveRecord::Base.sti_name that checks ActiveRecord::Base#store_ful...
technoweenie authored
1013 def sti_name
1014 store_full_sti_class ? name : name.demodulize
1015 end
1016
cd90dcb @lifo Rename Model.active_relation to Model.unscoped
lifo authored
1017 def unscoped
1018 @unscoped ||= Relation.new(self, arel_table)
1019 finder_needs_type_condition? ? @unscoped.where(type_condition) : @unscoped
f4a2356 @miloops Added ActiveRecord::Base#(where|join|project|group|order|take|skip) meth...
miloops authored
1020 end
1021
6e3bee6 @lifo Cache Model.arel_table
lifo authored
1022 def arel_table
1023 @arel_table ||= Arel::Table.new(table_name, :engine => arel_engine)
d2c4b3b @lifo Rename Model.engine to active_relation_engine. Cache arel_table and the ...
lifo authored
1024 end
1025
5a52523 @lifo Rename active_relation_engine -> arel_engine and active_relation_table -...
lifo authored
1026 def arel_engine
1027 @arel_engine ||= begin
a115b5d @lifo Ensure using proper engine for Arel::Table
lifo authored
1028 if self == ActiveRecord::Base
1029 Arel::Table.engine
1030 else
5a52523 @lifo Rename active_relation_engine -> arel_engine and active_relation_table -...
lifo authored
1031 connection_handler.connection_pools[name] ? Arel::Sql::Engine.new(self) : superclass.arel_engine
a115b5d @lifo Ensure using proper engine for Arel::Table
lifo authored
1032 end
1033 end
77c23b2 @lifo Use PredicateBuilder for sql hash sanitization
lifo authored
1034 end
1035
db045db @dhh Initial
dhh authored
1036 private
4b4dd54 @jeremy Clashing type columns due to a sloppy join shouldn't wreck single-table ...
jeremy authored
1037 # Finder methods must instantiate through this method to work with the
1038 # single-table inheritance model that makes it possible to create
1039 # objects of different types from the same table.
db045db @dhh Initial
dhh authored
1040 def instantiate(record)
3fc2d1e @jeremy Extract class-finder method from instantiate
jeremy authored
1041 object = find_sti_class(record[inheritance_column]).allocate
605bc77 @dhh Added a better exception for when a type column is used in a table witho...
dhh authored
1042
6d30002 @lifo Revert "Refactoring attributes/types" [#3348 state:open]
lifo authored
1043 object.instance_variable_set(:'@attributes', record)
3fc2d1e @jeremy Extract class-finder method from instantiate
jeremy authored
1044 object.instance_variable_set(:'@attributes_cache', {})
115230e @tenderlove cleaning up some test warnings
tenderlove authored
1045 object.instance_variable_set(:@new_record, false)
5de3698 @tenderlove cleaning up many more warnings in activerecord [#4180 state:resolved]
tenderlove authored
1046 object.instance_variable_set(:@readonly, false)
1047 object.instance_variable_set(:@destroyed, false)
1048 object.instance_variable_set(:@marked_for_destruction, false)
8c3e46c @tenderlove clean up more warnings, remove unnecessary methods, fix eval line number...
tenderlove authored
1049 object.instance_variable_set(:@previously_changed, {})
1050 object.instance_variable_set(:@changed_attributes, {})
55efae2 @jeremy Performance: absorb instantiate and initialize_with_callbacks into the B...
jeremy authored
1051
4f37b97 @josevalim Changed ActiveRecord to use new callbacks and speed up observers by only...
josevalim authored
1052 object.send(:_run_find_callbacks)
1053 object.send(:_run_initialize_callbacks)
55efae2 @jeremy Performance: absorb instantiate and initialize_with_callbacks into the B...
jeremy authored
1054
81737fc @jeremy r1613@asus: jeremy | 2005-07-03 07:04:53 -0700
jeremy authored
1055 object
db045db @dhh Initial
dhh authored
1056 end
81737fc @jeremy r1613@asus: jeremy | 2005-07-03 07:04:53 -0700
jeremy authored
1057
3fc2d1e @jeremy Extract class-finder method from instantiate
jeremy authored
1058 def find_sti_class(type_name)
1059 if type_name.blank? || !columns_hash.include?(inheritance_column)
1060 self
1061 else
1062 begin
1063 compute_type(type_name)
1064 rescue NameError
1065 raise SubclassNotFound,
1066 "The single-table inheritance mechanism failed to locate the subclass: '#{type_name}'. " +
1067 "This error is raised because the column '#{inheritance_column}' is reserved for storing the class in case of inheritance. " +
1068 "Please rename this column if you didn't intend it to be used for storing the inheritance class " +
1069 "or overwrite #{name}.inheritance_column to use another column for that information."
1070 end
1071 end
1072 end
1073
c7d6d68 @jeremy Reflections don't attempt to resolve module nesting of association class...
jeremy authored
1074 # Nest the type name in the same module as this class.
1075 # Bar is "MyApp::Business::Bar" relative to MyApp::Business::Foo
db045db @dhh Initial
dhh authored
1076 def type_name_with_module(type_name)
72483c0 @technoweenie Add ActiveRecord::Base.sti_name that checks ActiveRecord::Base#store_ful...
technoweenie authored
1077 if store_full_sti_class
1078 type_name
1079 else
1080 (/^::/ =~ type_name) ? type_name : "#{parent.name}::#{type_name}"
1081 end
db045db @dhh Initial
dhh authored
1082 end
1083
bed9179 @lifo Make scopes use relations under the hood
lifo authored
1084 def construct_finder_arel(options = {}, scope = nil)
8ff2fb6 @lifo Make default_scope work with Relations
lifo authored
1085 relation = options.is_a?(Hash) ? unscoped.apply_finder_options(options) : unscoped.merge(options)
bed9179 @lifo Make scopes use relations under the hood
lifo authored
1086 relation = scope.merge(relation) if scope
6b67df7 @miloops Revert "Revert "Add readonly support for relations.""
miloops authored
1087 relation
19d2ff8 @miloops Calculations now use Arel to construct the query.
miloops authored
1088 end
1089
2d0bc08 @lifo Make type_condition return Arel predicate and not a string condition
lifo authored
1090 def type_condition
5a52523 @lifo Rename active_relation_engine -> arel_engine and active_relation_table -...
lifo authored
1091 sti_column = arel_table[inheritance_column]
d200d08 @lifo Use arel for building the STI type condition
lifo authored
1092 condition = sti_column.eq(sti_name)
1093 subclasses.each{|subclass| condition = condition.or(sti_column.eq(subclass.sti_name)) }
6e39c9e @jeremy r1614@asus: jeremy | 2005-07-03 08:01:08 -0700
jeremy authored
1094
2d0bc08 @lifo Make type_condition return Arel predicate and not a string condition
lifo authored
1095 condition
db045db @dhh Initial
dhh authored
1096 end
1097
1098 # Guesses the table name, but does not decorate it with prefix and suffix information.
def7460 @technoweenie Added Base.abstract_class? that marks which classes are not part of the ...
technoweenie authored
1099 def undecorated_table_name(class_name = base_class.name)
3b0e1d9 @josh Prefer string core_ext inflector methods over directly accessing Inflect...
josh authored
1100 table_name = class_name.to_s.demodulize.underscore
1101 table_name = table_name.pluralize if pluralize_table_names
6e39c9e @jeremy r1614@asus: jeremy | 2005-07-03 08:01:08 -0700
jeremy authored
1102 table_name
db045db @dhh Initial
dhh authored
1103 end
1104
39e1ac6 @lifo Merge docrails
lifo authored
1105 # Enables dynamic finders like <tt>find_by_user_name(user_name)</tt> and <tt>find_by_user_name_and_password(user_name, password)</tt>
1efc8ed @lifo Fix dynamic finder docs
lifo authored
1106 # that are turned into <tt>where(:user_name => user_name).first</tt> and <tt>where(:user_name => user_name, :password => :password).first</tt>
1107 # respectively. Also works for <tt>all</tt> by using <tt>find_all_by_amount(50)</tt> that is turned into <tt>where(:amount => 50).all</tt>.
2a30594 @technoweenie documentation project patches, closes #7342, #7319, #7316, #7190 [jeremy...
technoweenie authored
1108 #
39e1ac6 @lifo Merge docrails
lifo authored
1109 # It's even possible to use all the additional parameters to +find+. For example, the full interface for +find_all_by_amount+
1110 # is actually <tt>find_all_by_amount(amount, options)</tt>.
4a1388a Define dynamic finders as real methods after first usage. Close #9317
Tobias Lütke authored
1111 #
66ee589 @yaroslav Introduce dynamic scopes for ActiveRecord: you can now use class methods...
yaroslav authored
1112 # Also enables dynamic scopes like scoped_by_user_name(user_name) and scoped_by_user_name_and_password(user_name, password) that
1113 # are turned into scoped(:conditions => ["user_name = ?", user_name]) and scoped(:conditions => ["user_name = ? AND password = ?", user_name, password])
1114 # respectively.
1115 #
1116 # Each dynamic finder, scope or initializer/creator is also defined in the class after it is first invoked, so that future
4a1388a Define dynamic finders as real methods after first usage. Close #9317
Tobias Lütke authored
1117 # attempts to use it do not run through method_missing.
8a77c4a Fixed issue where block is not called on the very first invocation of a ...
Ken Miller authored
1118 def method_missing(method_id, *arguments, &block)
143f5fb @joshsusser refactor dynamic finder name matching into its own class
joshsusser authored
1119 if match = DynamicFinderMatch.match(method_id)
1120 attribute_names = match.attribute_names
a5a82d9 @dhh Added extension capabilities to has_many and has_and_belongs_to_many pro...
dhh authored
1121 super unless all_attributes_exists?(attribute_names)
143f5fb @joshsusser refactor dynamic finder name matching into its own class
joshsusser authored
1122 if match.finder?
8829d6e @lifo Make Model.find_by_* and Model.find_all_by_* use relations and remove dy...
lifo authored
1123 options = arguments.extract_options!
bed9179 @lifo Make scopes use relations under the hood
lifo authored
1124 relation = options.any? ? construct_finder_arel(options, current_scoped_methods) : scoped
8829d6e @lifo Make Model.find_by_* and Model.find_all_by_* use relations and remove dy...
lifo authored
1125 relation.send :find_by_attributes, match, attribute_names, *arguments
143f5fb @joshsusser refactor dynamic finder name matching into its own class
joshsusser authored
1126 elsif match.instantiator?
85770ec @lifo Make Model.find_or_create_by_* and find_or_initialize_by_* use relations...
lifo authored
1127 scoped.send :find_or_instantiator_by_attributes, match, attribute_names, *arguments, &block
143f5fb @joshsusser refactor dynamic finder name matching into its own class
joshsusser authored
1128 end
66ee589 @yaroslav Introduce dynamic scopes for ActiveRecord: you can now use class methods...
yaroslav authored
1129 elsif match = DynamicScopeMatch.match(method_id)
1130 attribute_names = match.attribute_names
1131 super unless all_attributes_exists?(attribute_names)
1132 if match.scope?
1133 self.class_eval %{
1134 def self.#{method_id}(*args) # def self.scoped_by_user_name_and_password(*args)
1135 options = args.extract_options! # options = args.extract_options!
1136 attributes = construct_attributes_from_arguments( # attributes = construct_attributes_from_arguments(
1137 [:#{attribute_names.join(',:')}], args # [:user_name, :password], args
1138 ) # )
0905396 @miloops construct_finder_sql now use Arel
miloops authored
1139 #
66ee589 @yaroslav Introduce dynamic scopes for ActiveRecord: you can now use class methods...
yaroslav authored
1140 scoped(:conditions => attributes) # scoped(:conditions => attributes)
1141 end # end
1142 }, __FILE__</