relationships (DataMapper::Model::Relationship)

    # File lib/dm-core/model/relationship.rb, line 48
          def relationships(repository_name = default_repository_name)
            # TODO: create RelationshipSet#copy that will copy the relationships, but assign the
            # new Relationship objects to a supplied repository and model.  dup does not really
            # do what is needed

            @relationships[repository_name] ||= if repository_name == default_repository_name
              Mash.new
            else
              relationships(default_repository_name).dup
            end
          end