# File lib/rabl/builder.rb, line 120
      def merge_engines_into_result
        engines.each do |engine|
          case engine
          when Hash
            # engine was stored in the form { name => #<Engine> }
            engine.each do |key, value|
              engine[key] = value.render if value.is_a?(Engine)
            end
          when Engine
            engine = engine.render
          end

          @_result.merge!(engine) if engine.is_a?(Hash)
        end
      end