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# encoding: utf-8
module Mongoid # :nodoc:
module Relations #:nodoc:
# This module contains the behaviour for handling polymorphic relational
# associations.
module Polymorphic
extend ActiveSupport::Concern
included do
class_attribute :polymorphic
end
# Is the document in a polymorphic relation?
#
# @note Refactored from using delegate for class load performance.
#
# @example Is the document polymorphic?
# model.polymorphic?
#
# @return [ true, false ] If the document is in a polymorphic relation.
def polymorphic?
self.class.polymorphic?
end
module ClassMethods #:nodoc:
# Attempts to set up the information needed to handle a polymorphic
# relation, if the metadata checks out.
#
# @example Set up the polymorphic information.
# Movie.polymorph(metadata)
#
# @param [ Metadata ] metadata The relation metadata.
#
# @return [ Class ] The class being set up.
#
# @since 2.0.0.rc.1
def polymorph(metadata)
tap do |klass|
if metadata.polymorphic?
klass.polymorphic = true
if metadata.relation.stores_foreign_key?
field(metadata.inverse_type, :type => String)
end
end
end
end
# Determines if the class is in a polymorphic relations, and thus must
# store the _type field in the database.
#
# @example Check if the class is polymorphic.
# Movie.polymorphic?
#
# @return [ true, false ] True if polymorphic, false if not.
#
# @since 2.0.0.rc.1
def polymorphic?
!!polymorphic
end
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems