<commit_before>module DataMapper
  module Associations
    include Extlib::Assertions
    extend Chainable

    # Raised on attempt to operate on collection of child objects
    # when parent object is not yet saved.
    # For instance, if your article object is not saved,
    # but you try to fetch or scope down comments (1:n case), or
    # publications (n:m case), operation cannot be completed
    # because parent object's keys are not yet persisted,
    # and thus there is no FK value to use in the query.
    class UnsavedParentError < RuntimeError; end

    # Initializes relationships hash for extended model
    # class.
    #
    # When model calls has n, has 1 or belongs_to, relationships
    # are stored in that hash: keys are repository names and
    # values are relationship sets.
    #
    # @api private
    def self.extended(model)
      model.instance_variable_set(:@relationships, {})
    end

    chainable do
      # When DataMapper model is inherited, relationships
      # of parent are duplicated and copied to subclass model
      #
      # @api private
      def inherited(target)
        # TODO: Create a RelationshipSet class, and then add a method that allows copying the relationships to the supplied repository and model
        duped_relationships = {}
        @relationships.each do |repository_name, relationships|
          duped_relationship = duped_relationships[repository_name] ||= Mash.new

          relationships.each do |name, relationship|
            dup = relationship.dup

            [ :@child_model, :@parent_mode ].each do |ivar|
              if dup.instance_variable_defined?(ivar) && dup.instance_variable_get(ivar) == self
                dup.instance_variable_set(ivar, target)
              end
            end

            duped_relationship[name] = dup
          end
        end

        target.instance_variable_set(:@relationships, duped_relationships)

        super
      end
    end

    ##
    # Returns all relationships that are many-to-one for this model.
    #
    # Used to find the relationships that require properties in any Repository.
    #
    #  class Plur
    #    include DataMapper::Resource
    #
    #    def self.default_repository_name
    #      :plur_db
    #    end
    #
    #    repository(:plupp_db) do
    #      has 1, :plupp
    #    end<commit_msg>Properly copy @parent_model to subclass relationships<commit_after>module DataMapper
  module Associations
    include Extlib::Assertions
    extend Chainable

    # Raised on attempt to operate on collection of child objects
    # when parent object is not yet saved.
    # For instance, if your article object is not saved,
    # but you try to fetch or scope down comments (1:n case), or
    # publications (n:m case), operation cannot be completed
    # because parent object's keys are not yet persisted,
    # and thus there is no FK value to use in the query.
    class UnsavedParentError < RuntimeError; end

    # Initializes relationships hash for extended model
    # class.
    #
    # When model calls has n, has 1 or belongs_to, relationships
    # are stored in that hash: keys are repository names and
    # values are relationship sets.
    #
    # @api private
    def self.extended(model)
      model.instance_variable_set(:@relationships, {})
    end

    chainable do
      # When DataMapper model is inherited, relationships
      # of parent are duplicated and copied to subclass model
      #
      # @api private
      def inherited(target)
        # TODO: Create a RelationshipSet class, and then add a method that allows copying the relationships to the supplied repository and model
        duped_relationships = {}
        @relationships.each do |repository_name, relationships|
          duped_relationship = duped_relationships[repository_name] ||= Mash.new

          relationships.each do |name, relationship|
            dup = relationship.dup

            [ :@child_model, :@parent_model ].each do |ivar|
              if dup.instance_variable_defined?(ivar) && dup.instance_variable_get(ivar) == self
                dup.instance_variable_set(ivar, target)
              end
            end

            duped_relationship[name] = dup
          end
        end

        target.instance_variable_set(:@relationships, duped_relationships)

        super
      end
    end

    ##
    # Returns all relationships that are many-to-one for this model.
    #
    # Used to find the relationships that require properties in any Repository.
    #
    #  class Plur
    #    include DataMapper::Resource
    #
    #    def self.default_repository_name
    #      :plur_db
    #    end
    #
    #    repository(:plupp_db) do
    #      has 1, :plupp
    #    end
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