# File lib/rolify/adapters/active_record/resource_adapter.rb, line 28
      def in(relation, user, role_names)
        roles = user.roles.where(:name => role_names).select("#{quote_table(role_class.table_name)}.#{quote_column(role_class.primary_key)}")
        relation.where("#{quote_table(role_class.table_name)}.#{quote_column(role_class.primary_key)} IN (?) AND ((#{quote_table(role_class.table_name)}.resource_id = #{quote_table(relation.table_name)}.#{quote_column(relation.primary_key)}) OR (#{quote_table(role_class.table_name)}.resource_id IS NULL))", roles)
      end