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require 'cgi'
require 'action_view/helpers/form_helper'
module ActionView
class Base
@@field_error_proc = Proc.new{ |html_tag, instance| "<div class=\"fieldWithErrors\">#{html_tag}</div>" }
cattr_accessor :field_error_proc
end
module Helpers
# The Active Record Helper makes it easier to create forms for records kept in instance variables. The most far-reaching is the +form+
# method that creates a complete form for all the basic content types of the record (not associations or aggregations, though). This
# is a great way of making the record quickly available for editing, but likely to prove lackluster for a complicated real-world form.
# In that case, it's better to use the +input+ method and the specialized +form+ methods in link:classes/ActionView/Helpers/FormHelper.html
module ActiveRecordHelper
# Returns a default input tag for the type of object returned by the method. For example, if <tt>@post</tt>
# has an attribute +title+ mapped to a +VARCHAR+ column that holds "Hello World":
#
# input("post", "title")
# # => <input id="post_title" name="post[title]" size="30" type="text" value="Hello World" />
def input(record_name, method, options = {})
InstanceTag.new(record_name, method, self).to_tag(options)
end
# Returns an entire form with all needed input tags for a specified Active Record object. For example, if <tt>@post</tt>
# has attributes named +title+ of type +VARCHAR+ and +body+ of type +TEXT+ then
#
# form("post")
#
# would yield a form like the following (modulus formatting):
#
# <form action='/posts/create' method='post'>
# <p>
# <label for="post_title">Title</label><br />
# <input id="post_title" name="post[title]" size="30" type="text" value="Hello World" />
# </p>
# <p>
# <label for="post_body">Body</label><br />
# <textarea cols="40" id="post_body" name="post[body]" rows="20"></textarea>
# </p>
# <input name="commit" type="submit" value="Create" />
# </form>
#
# It's possible to specialize the form builder by using a different action name and by supplying another
# block renderer. For example, if <tt>@entry</tt> has an attribute +message+ of type +VARCHAR+ then
#
# form("entry",
# :action => "sign",
# :input_block => Proc.new { |record, column|
# "#{column.human_name}: #{input(record, column.name)}<br />"
# })
#
# would yield a form like the following (modulus formatting):
#
# <form action="/entries/sign" method="post">
# Message:
# <input id="entry_message" name="entry[message]" size="30" type="text" /><br />
# <input name="commit" type="submit" value="Sign" />
# </form>
#
# It's also possible to add additional content to the form by giving it a block, such as:
#
# form("entry", :action => "sign") do |form|
# form << content_tag("b", "Department")
# form << collection_select("department", "id", @departments, "id", "name")
# end
#
# The following options are available:
#
# * <tt>:action</tt> - The action used when submitting the form (default: +create+ if a new record, otherwise +update+).
# * <tt>:input_block</tt> - Specialize the output using a different block, see above.
# * <tt>:method</tt> - The method used when submitting the form (default: +post+).
# * <tt>:multipart</tt> - Whether to change the enctype of the form to "multipart/form-data", used when uploading a file (default: +false+).
# * <tt>:submit_value</tt> - The text of the submit button (default: "Create" if a new record, otherwise "Update").
def form(record_name, options = {})
record = instance_variable_get("@#{record_name}")
options = options.symbolize_keys
options[:action] ||= record.new_record? ? "create" : "update"
action = url_for(:action => options[:action], :id => record)
submit_value = options[:submit_value] || options[:action].gsub(/[^\w]/, '').capitalize
contents = form_tag({:action => action}, :method =>(options[:method] || 'post'), :enctype => options[:multipart] ? 'multipart/form-data': nil)
contents << hidden_field(record_name, :id) unless record.new_record?
contents << all_input_tags(record, record_name, options)
yield contents if block_given?
contents << submit_tag(submit_value)
contents << '</form>'
end
# Returns a string containing the error message attached to the +method+ on the +object+ if one exists.
# This error message is wrapped in a <tt>DIV</tt> tag, which can be extended to include a +prepend_text+ and/or +append_text+
# (to properly explain the error), and a +css_class+ to style it accordingly. +object+ should either be the name of an instance variable or
# the actual object. As an example, let's say you have a model <tt>@post</tt> that has an error message on the +title+ attribute:
#
# <%= error_message_on "post", "title" %>
# # => <div class="formError">can't be empty</div>
#
# <%= error_message_on @post, "title" %>
# # => <div class="formError">can't be empty</div>
#
# <%= error_message_on "post", "title", "Title simply ", " (or it won't work).", "inputError" %>
# # => <div class="inputError">Title simply can't be empty (or it won't work).</div>
def error_message_on(object, method, prepend_text = "", append_text = "", css_class = "formError")
if (obj = (object.respond_to?(:errors) ? object : instance_variable_get("@#{object}"))) &&
(errors = obj.errors.on(method))
content_tag("div", "#{prepend_text}#{errors.is_a?(Array) ? errors.first : errors}#{append_text}", :class => css_class)
else
''
end
end
# Returns a string with a <tt>DIV</tt> containing all of the error messages for the objects located as instance variables by the names
# given. If more than one object is specified, the errors for the objects are displayed in the order that the object names are
# provided.
#
# This <tt>DIV</tt> can be tailored by the following options:
#
# * <tt>:header_tag</tt> - Used for the header of the error div (default: "h2").
# * <tt>:id</tt> - The id of the error div (default: "errorExplanation").
# * <tt>:class</tt> - The class of the error div (default: "errorExplanation").
# * <tt>:object</tt> - The object (or array of objects) for which to display errors,
# if you need to escape the instance variable convention.
# * <tt>:object_name</tt> - The object name to use in the header, or any text that you prefer.
# If <tt>:object_name</tt> is not set, the name of the first object will be used.
# * <tt>:header_message</tt> - The message in the header of the error div. Pass +nil+
# or an empty string to avoid the header message altogether. (Default: "X errors
# prohibited this object from being saved").
# * <tt>:message</tt> - The explanation message after the header message and before
# the error list. Pass +nil+ or an empty string to avoid the explanation message
# altogether. (Default: "There were problems with the following fields:").
#
# To specify the display for one object, you simply provide its name as a parameter.
# For example, for the <tt>@user</tt> model:
#
# error_messages_for 'user'
#
# To specify more than one object, you simply list them; optionally, you can add an extra <tt>:object_name</tt> parameter, which
# will be the name used in the header message:
#
# error_messages_for 'user_common', 'user', :object_name => 'user'
#
# If the objects cannot be located as instance variables, you can add an extra <tt>:object</tt> parameter which gives the actual
# object (or array of objects to use):
#
# error_messages_for 'user', :object => @question.user
#
# NOTE: This is a pre-packaged presentation of the errors with embedded strings and a certain HTML structure. If what
# you need is significantly different from the default presentation, it makes plenty of sense to access the <tt>object.errors</tt>
# instance yourself and set it up. View the source of this method to see how easy it is.
def error_messages_for(*params)
options = params.extract_options!.symbolize_keys
if object = options.delete(:object)
objects = [object].flatten
else
objects = params.collect {|object_name| instance_variable_get("@#{object_name}") }.compact
end
count = objects.inject(0) {|sum, object| sum + object.errors.count }
unless count.zero?
html = {}
[:id, :class].each do |key|
if options.include?(key)
value = options[key]
html[key] = value unless value.blank?
else
html[key] = 'errorExplanation'
end
end
options[:object_name] ||= params.first
options[:header_message] = "#{pluralize(count, 'error')} prohibited this #{options[:object_name].to_s.gsub('_', ' ')} from being saved" unless options.include?(:header_message)
options[:message] ||= 'There were problems with the following fields:' unless options.include?(:message)
error_messages = objects.sum {|object| object.errors.full_messages.map {|msg| content_tag(:li, msg) } }.join
contents = ''
contents << content_tag(options[:header_tag] || :h2, options[:header_message]) unless options[:header_message].blank?
contents << content_tag(:p, options[:message]) unless options[:message].blank?
contents << content_tag(:ul, error_messages)
content_tag(:div, contents, html)
else
''
end
end
private
def all_input_tags(record, record_name, options)
input_block = options[:input_block] || default_input_block
record.class.content_columns.collect{ |column| input_block.call(record_name, column) }.join("\n")
end
def default_input_block
Proc.new { |record, column| %(<p><label for="#{record}_#{column.name}">#{column.human_name}</label><br />#{input(record, column.name)}</p>) }
end
end
class InstanceTag #:nodoc:
def to_tag(options = {})
case column_type
when :string
field_type = @method_name.include?("password") ? "password" : "text"
to_input_field_tag(field_type, options)
when :text
to_text_area_tag(options)
when :integer, :float, :decimal
to_input_field_tag("text", options)
when :date
to_date_select_tag(options)
when :datetime, :timestamp
to_datetime_select_tag(options)
when :time
to_time_select_tag(options)
when :boolean
to_boolean_select_tag(options)
end
end
alias_method :tag_without_error_wrapping, :tag
def tag(name, options)
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(tag_without_error_wrapping(name, options), object.errors.on(@method_name))
else
tag_without_error_wrapping(name, options)
end
end
alias_method :content_tag_without_error_wrapping, :content_tag
def content_tag(name, value, options)
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(content_tag_without_error_wrapping(name, value, options), object.errors.on(@method_name))
else
content_tag_without_error_wrapping(name, value, options)
end
end
alias_method :to_date_select_tag_without_error_wrapping, :to_date_select_tag
def to_date_select_tag(options = {}, html_options = {})
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(to_date_select_tag_without_error_wrapping(options, html_options), object.errors.on(@method_name))
else
to_date_select_tag_without_error_wrapping(options, html_options)
end
end
alias_method :to_datetime_select_tag_without_error_wrapping, :to_datetime_select_tag
def to_datetime_select_tag(options = {}, html_options = {})
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(to_datetime_select_tag_without_error_wrapping(options, html_options), object.errors.on(@method_name))
else
to_datetime_select_tag_without_error_wrapping(options, html_options)
end
end
alias_method :to_time_select_tag_without_error_wrapping, :to_time_select_tag
def to_time_select_tag(options = {}, html_options = {})
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(to_time_select_tag_without_error_wrapping(options, html_options), object.errors.on(@method_name))
else
to_time_select_tag_without_error_wrapping(options, html_options)
end
end
def error_wrapping(html_tag, has_error)
has_error ? Base.field_error_proc.call(html_tag, self) : html_tag
end
def error_message
object.errors.on(@method_name)
end
def column_type
object.send("column_for_attribute", @method_name).type
end
end
end
end
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