module Mongoid::Attributes::Nested::ClassMethods

Constants

REJECT_ALL_BLANK_PROC

Public Instance Methods

accepts_nested_attributes_for(*args) click to toggle source

Used when needing to update related models from a parent association. Can be used on embedded or referenced associations.

@example Defining nested attributes.

class Person
  include Mongoid::Document

  embeds_many :addresses
  embeds_one :game
  references_many :posts

  accepts_nested_attributes_for :addresses, :game, :posts
end

@param [ Array<Symbol>, Hash ] args A list of association names, followed

by a hash of options.

@option *args [ true, false ] :allow_destroy Can deletion occur? @option *args [ Proc, Symbol ] :reject_if Block or symbol pointing

to a class method to reject documents with.

@option *args [ Integer ] :limit The max number to create. @option *args [ true, false ] :update_only Only update existing docs. @options *args [ true, false ] :autosave Whether autosave should be enabled on the

association. Note that since the default is true, setting autosave to nil will still
enable it.
# File lib/mongoid/attributes/nested.rb, line 50
def accepts_nested_attributes_for(*args)
  options = args.extract_options!.dup
  options[:autosave] = true if options[:autosave].nil?

  options[:reject_if] = REJECT_ALL_BLANK_PROC if options[:reject_if] == :all_blank
  args.each do |name|
    meth = "#{name}_attributes="
    self.nested_attributes["#{name}_attributes"] = meth
    association = relations[name.to_s]
    raise Errors::NestedAttributesMetadataNotFound.new(self, name) unless association
    autosave_nested_attributes(association) if options[:autosave]

    re_define_method(meth) do |attrs|
      _assigning do
        if association.polymorphic? and association.inverse_type
          options = options.merge!(:class_name => self.send(association.inverse_type))
        end
        association.nested_builder(attrs, options).build(self)
      end
    end
  end
end

Private Instance Methods

autosave_nested_attributes(association) click to toggle source

Add the autosave information for the nested association.

@api private

@example Add the autosave if appropriate.

Person.autosave_nested_attributes(metadata)

@param [ Association ] association The existing association metadata.

@since 3.1.4

# File lib/mongoid/attributes/nested.rb, line 85
def autosave_nested_attributes(association)
  # In order for the autosave functionality to work properly, the association needs to be
  # marked as autosave despite the fact that the option isn't present. Because the method
  # Association#autosave? is implemented by checking the autosave option, this is the most
  # straightforward way to mark it.
  if association.autosave? || (association.options[:autosave].nil? && !association.embedded?)
    association.options[:autosave] = true
    Association::Referenced::AutoSave.define_autosave!(association)
  end
end