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resource.rb
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resource.rb
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# TODO: DRY up raise_on_save_failure with attr_accessor_with_default
# once AS branch is merged in
module DataMapper
module Resource
include DataMapper::Assertions
extend Chainable
extend Deprecate
deprecate :new_record?, :new?
# @deprecated
def self.append_inclusions(*inclusions)
warn "DataMapper::Resource.append_inclusions is deprecated, use DataMapper::Model.append_inclusions instead (#{caller[0]})"
Model.append_inclusions(*inclusions)
end
# @deprecated
def self.extra_inclusions
warn "DataMapper::Resource.extra_inclusions is deprecated, use DataMapper::Model.extra_inclusions instead (#{caller[0]})"
Model.extra_inclusions
end
# @deprecated
def self.descendants
warn "DataMapper::Resource.descendants is deprecated, use DataMapper::Model.descendants instead (#{caller[0]})"
Model.descendants
end
# Return if Resource#save should raise an exception on save failures (per-resource)
#
# This delegates to model.raise_on_save_failure by default.
#
# user.raise_on_save_failure # => false
#
# @return [Boolean]
# true if a failure in Resource#save should raise an exception
#
# @api public
def raise_on_save_failure
if defined?(@raise_on_save_failure)
@raise_on_save_failure
else
model.raise_on_save_failure
end
end
# Specify if Resource#save should raise an exception on save failures (per-resource)
#
# @param [Boolean]
# a boolean that if true will cause Resource#save to raise an exception
#
# @return [Boolean]
# true if a failure in Resource#save should raise an exception
#
# @api public
def raise_on_save_failure=(raise_on_save_failure)
@raise_on_save_failure = raise_on_save_failure
end
# Deprecated API for updating attributes and saving Resource
#
# @see #update
#
# @deprecated
def update_attributes(attributes = {}, *allowed)
model = self.model
call_stack = caller[0]
warn "#{model}#update_attributes is deprecated, use #{model}#update instead (#{call_stack})"
if allowed.any?
warn "specifying allowed in #{model}#update_attributes is deprecated, " \
"use Hash#only to filter the attributes in the caller (#{call_stack})"
attributes = attributes.only(*allowed)
end
assert_update_clean_only(:update_attributes)
update(attributes)
end
# Makes sure a class gets all the methods when it includes Resource
#
# @api private
def self.included(model)
[ :id, :type ].each do |method|
model.send(:undef_method, method) if model.method_defined?(method)
end
model.extend Model
end
# @api public
alias_method :model, :class
# Repository this resource belongs to in the context of this collection
# or of the resource's class.
#
# @return [Repository]
# the respository this resource belongs to, in the context of
# a collection OR in the instance's Model's context
#
# @api semipublic
def repository
# only set @_repository explicitly when persisted
defined?(@_repository) ? @_repository : model.repository
end
# Retrieve the key(s) for this resource.
#
# This always returns the persisted key value,
# even if the key is changed and not yet persisted.
# This is done so all relations still work.
#
# @return [Array(Key)]
# the key(s) identifying this resource
#
# @api public
def key
return @_key if defined?(@_key)
model_key = model.key(repository_name)
key = model_key.map do |property|
original_attributes[property] || (property.loaded?(self) ? property.get!(self) : nil)
end
# only memoize a valid key
@_key = key if model_key.valid?(key)
end
# Checks if this Resource instance is new
#
# @return [Boolean]
# true if the resource is new and not saved
#
# @api public
def new?
!saved?
end
# Checks if this Resource instance is saved
#
# @return [Boolean]
# true if the resource has been saved
#
# @api public
def saved?
@_saved == true
end
# Checks if this Resource instance is destroyed
#
# @return [Boolean]
# true if the resource has been destroyed
#
# @api public
def destroyed?
@_destroyed == true
end
# Checks if the resource has no changes to save
#
# @return [Boolean]
# true if the resource may not be persisted
#
# @api public
def clean?
!dirty?
end
# Checks if the resource has unsaved changes
#
# @return [Boolean]
# true if resource may be persisted
#
# @api public
def dirty?
run_once(true) do
dirty_self? || dirty_parents? || dirty_children?
end
end
# Checks if this Resource instance is readonly
#
# @return [Boolean]
# true if the resource cannot be persisted
#
# @api public
def readonly?
@_readonly == true
end
# Returns the value of the attribute.
#
# Do not read from instance variables directly, but use this method.
# This method handles lazy loading the attribute and returning of
# defaults if nessesary.
#
# @example
# class Foo
# include DataMapper::Resource
#
# property :first_name, String
# property :last_name, String
#
# def full_name
# "#{attribute_get(:first_name)} #{attribute_get(:last_name)}"
# end
#
# # using the shorter syntax
# def name_for_address_book
# "#{last_name}, #{first_name}"
# end
# end
#
# @param [Symbol] name
# name of attribute to retrieve
#
# @return [Object]
# the value stored at that given attribute
# (nil if none, and default if necessary)
#
# @api public
def attribute_get(name)
properties[name].get(self)
end
alias [] attribute_get
# Sets the value of the attribute and marks the attribute as dirty
# if it has been changed so that it may be saved. Do not set from
# instance variables directly, but use this method. This method
# handles the lazy loading the property and returning of defaults
# if nessesary.
#
# @example
# class Foo
# include DataMapper::Resource
#
# property :first_name, String
# property :last_name, String
#
# def full_name(name)
# name = name.split(' ')
# attribute_set(:first_name, name[0])
# attribute_set(:last_name, name[1])
# end
#
# # using the shorter syntax
# def name_from_address_book(name)
# name = name.split(', ')
# first_name = name[1]
# last_name = name[0]
# end
# end
#
# @param [Symbol] name
# name of attribute to set
# @param [Object] value
# value to store
#
# @return [Object]
# the value stored at that given attribute, nil if none,
# and default if necessary
#
# @api public
def attribute_set(name, value)
properties[name].set(self, value)
end
alias []= attribute_set
# Gets all the attributes of the Resource instance
#
# @param [Symbol] key_on
# Use this attribute of the Property as keys.
# defaults to :name. :field is useful for adapters
# :property or nil use the actual Property object.
#
# @return [Hash]
# All the attributes
#
# @api public
def attributes(key_on = :name)
attributes = {}
lazy_load(properties)
fields.each do |property|
if model.public_method_defined?(name = property.name)
key = case key_on
when :name then name
when :field then property.field
else property
end
attributes[key] = __send__(name)
end
end
attributes
end
# Assign values to multiple attributes in one call (mass assignment)
#
# @param [Hash] attributes
# names and values of attributes to assign
#
# @return [Hash]
# names and values of attributes assigned
#
# @api public
def attributes=(attributes)
model = self.model
attributes.each do |name, value|
case name
when String, Symbol
if model.public_method_defined?(setter = "#{name}=")
__send__(setter, value)
else
raise ArgumentError, "The attribute '#{name}' is not accessible in #{model}"
end
when Associations::Relationship, Property
name.set(self, value)
end
end
end
# Reloads association and all child association
#
# This is accomplished by resetting the Resource key to it's
# original value, and then removing all the ivars for properties
# and relationships. On the next access of those ivars, the
# resource will eager load what it needs. While this is more of
# a lazy reload, it should result is more consistent behavior
# since no cached results will remain from the initial load.
#
# @return [Resource]
# the receiver, the current Resource instance
#
# @api public
def reload
if key
reset_key
clear_subjects
end
self
end
# Updates attributes and saves this Resource instance
#
# @param [Hash] attributes
# attributes to be updated
#
# @return [Boolean]
# true if resource and storage state match
#
# @api public
def update(attributes)
assert_update_clean_only(:update)
self.attributes = attributes
save
end
# Updates attributes and saves this Resource instance, bypassing hooks
#
# @param [Hash] attributes
# attributes to be updated
#
# @return [Boolean]
# true if resource and storage state match
#
# @api public
def update!(attributes)
assert_update_clean_only(:update!)
self.attributes = attributes
save!
end
# Save the instance and loaded, dirty associations to the data-store
#
# @return [Boolean]
# true if Resource instance and all associations were saved
#
# @api public
def save
assert_not_destroyed(:save)
result = _save(true)
assert_save_successful(:save, result)
result
end
# Save the instance and loaded, dirty associations to the data-store, bypassing hooks
#
# @return [Boolean]
# true if Resource instance and all associations were saved
#
# @api public
def save!
assert_not_destroyed(:save!)
result = _save(false)
assert_save_successful(:save!, result)
result
end
# Destroy the instance, remove it from the repository
#
# @return [Boolean]
# true if resource was destroyed
#
# @api public
def destroy
return true if destroyed?
destroy_hook
end
# Destroy the instance, remove it from the repository, bypassing hooks
#
# @return [Boolean]
# true if resource was destroyed
#
# @api public
def destroy!
return true if destroyed?
_destroy(false)
end
# Compares another Resource for equality
#
# Resource is equal to +other+ if they are the same object
# (identical object_id) or if they are both of the *same model* and
# all of their attributes are equivalent
#
# @param [Resource] other
# the other Resource to compare with
#
# @return [Boolean]
# true if they are equal, false if not
#
# @api public
def eql?(other)
return true if equal?(other)
instance_of?(other.class) && cmp?(other, :eql?)
end
# Compares another Resource for equivalency
#
# Resource is equivalent to +other+ if they are the same object
# (identical object_id) or all of their attribute are equivalent
#
# @param [Resource] other
# the other Resource to compare with
#
# @return [Boolean]
# true if they are equivalent, false if not
#
# @api public
def ==(other)
return true if equal?(other)
other.respond_to?(:repository) &&
other.respond_to?(:key) &&
other.respond_to?(:clean?) &&
cmp?(other, :==)
end
# Compares two Resources to allow them to be sorted
#
# @param [Resource] other
# The other Resource to compare with
#
# @return [Integer]
# Return 0 if Resources should be sorted as the same, -1 if the
# other Resource should be after self, and 1 if the other Resource
# should be before self
#
# @api public
def <=>(other)
model = self.model
unless other.kind_of?(model.base_model)
raise ArgumentError, "Cannot compare a #{other.model} instance with a #{model} instance"
end
model.default_order(repository_name).each do |direction|
cmp = direction.get(self) <=> direction.get(other)
return cmp if cmp.nonzero?
end
0
end
# Returns hash value of the object.
# Two objects with the same hash value assumed equal (using eql? method)
#
# DataMapper resources are equal when their models have the same hash
# and they have the same set of properties
#
# When used as key in a Hash or Hash subclass, objects are compared
# by eql? and thus hash value has direct effect on lookup
#
# @api private
def hash
key.hash
end
# Get a Human-readable representation of this Resource instance
#
# Foo.new #=> #<Foo name=nil updated_at=nil created_at=nil id=nil>
#
# @return [String]
# Human-readable representation of this Resource instance
#
# @api public
def inspect
# TODO: display relationship values
attrs = properties.map do |property|
value = if new? || property.loaded?(self)
property.get!(self).inspect
else
'<not loaded>'
end
"#{property.instance_variable_name}=#{value}"
end
"#<#{model.name} #{attrs.join(' ')}>"
end
# Hash of original values of attributes that have unsaved changes
#
# @return [Hash]
# original values of attributes that have unsaved changes
#
# @api semipublic
def original_attributes
@_original_attributes ||= {}
end
# Checks if an attribute has been loaded from the repository
#
# @example
# class Foo
# include DataMapper::Resource
#
# property :name, String
# property :description, Text, :lazy => false
# end
#
# Foo.new.attribute_loaded?(:description) #=> false
#
# @return [Boolean]
# true if ivar +name+ has been loaded
#
# @return [Boolean]
# true if ivar +name+ has been loaded
#
# @api private
def attribute_loaded?(name)
properties[name].loaded?(self)
end
# Checks if an attribute has unsaved changes
#
# @param [Symbol] name
# name of attribute to check for unsaved changes
#
# @return [Boolean]
# true if attribute has unsaved changes
#
# @api semipublic
def attribute_dirty?(name)
dirty_attributes.key?(properties[name])
end
# Hash of attributes that have unsaved changes
#
# @return [Hash]
# attributes that have unsaved changes
#
# @api semipublic
def dirty_attributes
dirty_attributes = {}
original_attributes.each_key do |property|
dirty_attributes[property] = property.value(property.get!(self))
end
dirty_attributes
end
# Reset the Resource to a similar state as a new record:
# removes it from identity map and clears original property
# values (thus making all properties non dirty)
#
# @api private
def reset
@_saved = false
remove_from_identity_map
original_attributes.clear
self
end
# Returns the Collection the Resource is associated with
#
# @return [nil]
# nil if this is a new record
# @return [Collection]
# a Collection that self belongs to
#
# @api private
def collection
return @_collection if (@_collection && @_collection.query.conditions.matches?(self)) || new? || readonly?
collection_for_self
end
# Associates a Resource to a Collection
#
# @param [Collection, nil] collection
# the collection to associate the resource with
#
# @return [nil]
# nil if this is a new record
# @return [Collection]
# a Collection that self belongs to
#
# @api private
def collection=(collection)
@_collection = collection
end
# Return a collection including the current resource only
#
# @return [Collection]
# a collection containing self
#
# @api private
def collection_for_self
Collection.new(query, [ self ])
end
# Returns a Query that will match the resource
#
# @return [Query]
# Query that will match the resource
#
# @api semipublic
def query
Query.new(repository, model, :fields => fields, :conditions => conditions)
end
protected
# Method for hooking callbacks on resource creation
#
# @return [Boolean]
# true if the create was successful, false if not
#
# @api private
def create_hook
_create
end
# Method for hooking callbacks on resource updates
#
# @return [Boolean]
# true if the update was successful, false if not
#
# @api private
def update_hook
_update
end
# Method for hooking callbacks on resource destruction
#
# @return [Boolean]
# true if the destroy was successful, false if not
#
# @api private
def destroy_hook
_destroy(true)
end
private
# Initialize a new instance of this Resource using the provided values
#
# @param [Hash] attributes
# attribute values to use for the new instance
#
# @return [Hash]
# attribute values used in the new instance
#
# @api public
def initialize(attributes = {}, &block) # :nodoc:
self.attributes = attributes
end
# Returns name of the repository this object
# was loaded from
#
# @return [String]
# name of the repository this object was loaded from
#
# @api private
def repository_name
repository.name
end
# Gets this instance's Model's properties
#
# @return [Array(Property)]
# List of this Resource's Model's properties
#
# @api private
def properties
model.properties(repository_name)
end
# Gets this instance's Model's relationships
#
# @return [Array(Associations::Relationship)]
# List of this instance's Model's Relationships
#
# @api private
def relationships
model.relationships(repository_name)
end
# Returns the identity map for the model from the repository
#
# @return [IdentityMap]
# identity map of repository this object was loaded from
#
# @api private
def identity_map
repository.identity_map(model)
end
# @api private
def add_to_identity_map
identity_map[key] = self
end
# @api private
def remove_from_identity_map
identity_map.delete(key)
end
# Fetches all the names of the attributes that have been loaded,
# even if they are lazy but have been called
#
# @return [Array<Property>]
# names of attributes that have been loaded
#
# @api private
def fields
properties.select do |property|
property.loaded?(self) || (new? && property.default?)
end
end
# Reset the key to the original value
#
# @return [undefined]
#
# @api private
def reset_key
properties.key.zip(key) do |property, value|
property.set!(self, value)
original_attributes.delete(property)
end
end
# Remove all the ivars for properties and relationships
#
# @return [undefined]
#
# @api private
def clear_subjects
model_properties = properties
(model_properties - model_properties.key | relationships.values).each do |subject|
next unless subject.loaded?(self)
remove_instance_variable(subject.instance_variable_name)
original_attributes.delete(subject)
end
end
# Lazy loads attributes not yet loaded
#
# @param [Array<Property>] properties
# the properties to reload
#
# @return [self]
#
# @api private
def lazy_load(properties)
eager_load(properties - fields)
end
# Reloads specified attributes
#
# @param [Array<Property>] properties
# the properties to reload
#
# @return [Resource]
# the receiver, the current Resource instance
#
# @api private
def eager_load(properties)
unless properties.empty? || key.nil? || collection.nil?
collection.reload(:fields => properties)
end
self
end
# Return conditions to match the Resource
#
# @return [Hash]
# query conditions
#
# @api private
def conditions
key = self.key
if key
model.key_conditions(repository, key)
else
conditions = {}
properties.each do |property|
next unless property.loaded?(self)
conditions[property] = property.get!(self)
end
conditions
end
end
# @api private
def parent_relationships
parent_relationships = []
relationships.each_value do |relationship|
next unless relationship.respond_to?(:resource_for) && relationship.loaded?(self) && relationship.get!(self)
parent_relationships << relationship
end
parent_relationships
end
# Returns loaded child relationships
#
# @return [Array<Associations::OneToMany::Relationship>]
# array of child relationships for which this resource is parent and is loaded
#
# @api private
def child_relationships
child_relationships = []
relationships.each_value do |relationship|
next unless relationship.respond_to?(:collection_for) && relationship.loaded?(self) && relationship.get!(self)
child_relationships << relationship
end
many_to_many, other = child_relationships.partition do |relationship|
relationship.kind_of?(Associations::ManyToMany::Relationship)
end
many_to_many + other
end
# @api private
def parent_resources
parent_relationships.map { |relationship| relationship.get!(self) }
end
# @api private
def child_collections
child_relationships.map { |relationship| relationship.get!(self) }
end
# Creates the resource with default values
#
# If resource is not dirty or a new (not yet saved),
# this method returns false
#
# On successful save identity map of the repository is
# updated
#
# Needs to be a protected method so that it is hookable
#
# The primary purpose of this method is to allow before :create
# hooks to fire at a point just before/after resource creation
#
# @return [Boolean]
# true if the receiver was successfully created
#
# @api private
def _create
# set defaults for new resource
(properties | relationships.values).each do |subject|
next if subject.respond_to?(:serial?) && subject.serial? ||
subject.loaded?(self) ||
!subject.default?
subject.set(self, subject.default_for(self))
end
@_repository = repository
@_repository.create([ self ])
@_saved = true
original_attributes.clear
add_to_identity_map
true
end
# Updates resource state
#
# The primary purpose of this method is to allow before :update
# hooks to fire at a point just before/after resource update whether
# it is the result of Resource#save, or using Resource#update
#
# @return [Boolean]
# true if the receiver was successfully created
#
# @api private
def _update
original_attributes = self.original_attributes
if original_attributes.any? { |property, _value| !property.valid?(property.get!(self)) }
false
else
# remove from the identity map
remove_from_identity_map
repository.update(dirty_attributes, collection_for_self)
original_attributes.clear
# remove the cached key in case it is updated
remove_instance_variable(:@_key)
add_to_identity_map
true
end
end
# @api private
def _destroy(safe)
return false unless saved?
repository.delete(collection_for_self)
set_destroyed_state
true
end
# @api private
def set_destroyed_state
reset
@_readonly = true
@_destroyed = true
end
# @api private
def _save(safe)
run_once(true) do
save_parents(safe) && save_self(safe) && save_children(safe)
end
end
# Saves the resource
#
# @return [Boolean]
# true if the resource was successfully saved
#
# @api semipublic
def save_self(safe = true)
# short-circuit if the resource is not dirty
return saved? unless dirty_self?
new_resource = new?
if safe
new_resource ? create_hook : update_hook
else
new_resource ? _create : _update
end
end
# Saves the parent resources
#
# @return [Boolean]
# true if the parents were successfully saved
#
# @api private
def save_parents(safe)
run_once(true) do
parent_relationships.all? do |relationship|
parent = relationship.get!(self)
if parent.__send__(:save_parents, safe) && parent.__send__(:save_self, safe)