# File lib/data_mapper/constraints/migrations/model.rb, line 11
        def auto_migrate_constraints_up(repository_name = self.repository_name)
          # TODO: this check should not be here
          return if self.respond_to?(:is_remixable?) && self.is_remixable?

          relationships(repository_name).each do |relationship|
            relationship.auto_migrate_constraints_up(repository_name)
          end
        end