Question

我在我的应用程序中使用Rails作为后端。使用respond_with为show和Activity模型返回Workout操作。

关系：

Activity has_many Workouts
Workout has_many Exercises
... belongs_to ...

WorkOut控制器：

def show
    respond_with Workout.find(params[:id])
end

活动控制器：

def show
    respond_with Activity.find(params[:id])
end

路线：

               exercises GET    /exercises(.:format)                            exercises#index
                     POST   /exercises(.:format)                            exercises#create
            exercise GET    /exercises/:id(.:format)                        exercises#show
   activity_workouts GET    /activities/:activity_id/workouts(.:format)     workouts#index
                     POST   /activities/:activity_id/workouts(.:format)     workouts#create
    activity_workout GET    /activities/:activity_id/workouts/:id(.:format) workouts#show
          activities GET    /activities(.:format)                           activities#index
                     POST   /activities(.:format)                           activities#create
            activity GET    /activities/:id(.:format)                       activities#show

在浏览器中，我输入以下内容：

http://localhost:3000/activities/1.json

我得到了这个，其中包括此活动1下的所有Workouts：

{"id":1,"title":"Climbing","description":"climbing 1","created_at":"2017-03-13T17:48:30.220Z","updated_at":"2017-03-13T17:48:30.220Z","user_id":1,"workouts":[{"id":1,"name":"workout 1","description":"workout2","activity_id":1,"created_at":"2017-03-13T17:59:45.742Z","updated_at":"2017-03-13T17:59:45.742Z"},{"id":2,"name":"workout 2","description":"description 2","activity_id":1,"created_at":"2017-03-13T19:27:57.601Z","updated_at":"2017-03-13T19:27:57.601Z"},{"id":3,"name":"workout 3","description":"description 3","activity_id":1,"created_at":"2017-03-13T20:53:53.191Z","updated_at":"2017-03-13T20:53:53.191Z"},{"id":4,"name":"workout 4","description":"des 4","activity_id":1,"created_at":"2017-03-13T20:55:15.965Z","updated_at":"2017-03-13T20:55:15.965Z"}]}

但是当我输入时：

http://localhost:3000/activities/1/workouts/1.json

我刚接触中的exercises

{"id":1,"name":"workout 1","description":"workout2","activity_id":1,"created_at":"2017-03-13T17:59:45.742Z","updated_at":"2017-03-13T17:59:45.742Z"}

我不知道这两个动作之间的区别是什么。

解决方案：

在model.rb

下添加

  def as_json(options = {})
    super(options.merge(include: :exercises))
  end

Answer 1

这是我需要获得每个模型下的所有关联。我想没有它，每个模型都会在没有它的情况下出现。谢谢你的帮助！

  def as_json(options = {})
    super(options.merge(include: :exercises))
  end

Answer 2

在第一个中，你只要求一个特定的活动 - Activity，其身份为1（恰好还有一套全套的`锻炼）。

在第二个动作中，您要求通过id进行一项特定的锻炼。 ID为Workout的{{1}} - 这是您在json中收到的内容

这正是你要求的......;）

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2 个答案: