メモ: as_jsonのincludeのまとめ

 trades.as_json(
                :include => [
                                                {:merchandise => { 
                                                                        :include => [
                                                                                            :merchandise_images, 
                                                                                            :user => { 
                                                                                                :include => {
                                                                                                    :school => { :only => 'name' }
                                                                                                }
                                                                                            }
                                                                                          ]
                                                                         } 
                                                },
                                :buyer
                            ]
               )



 merchandises.as_json(
                      :include => [
                                                    {:user => { 
                                                                   :include => { :school => { :only => 'name'} },
                                                 :only => ['id', 'name', 'image'],
                                              }
                                    },
                                    :merchandise_images
                                  ]
                     )

Ruby on Railsで関連テーブルの情報をまとめて読み込む:includeオプションのまとめ
http://www.gesource.jp/weblog/?p=477