include

# File actionpack/lib/action_controller/metal/params_wrapper.rb, line 97
      def include
        return super if @include_set

        m = model
        synchronize do
          return super if @include_set

          @include_set = true

          unless super || exclude
            if m.respond_to?(:attribute_names) && m.attribute_names.any?
              self.include = m.attribute_names
            end
          end
        end
      end