ruby-on-rails - 如何在 Rails 中使用 API 返回嵌套注释

Question

每辆车都有关联_has_many :comments

我有以下方法来还车：

 class Api::V1::CarsController < Api::V1::BaseController
  def recent
      recent = Car.most_recent(params[:how_recent])
      comments = recent.each{|r| r.comments} ## ??
      respond_with(:recent => recent)
    end
  end

我通过以下方式获得最近的汽车：

curl -X GET http://cars.dev/api/v1/cars/recent -d "token=zzxWkB3SzDP3U1wDsJbY" -d "how_recent=20"  

我想得到这样的回应：

"recent_with_comments":{"recent":[{"type":"ferrari","price":null,"user_id":78,"username":null,"comments":[{"id":1, "comment": "some text"},{"id":2, "comment": "some text 2"}]}]

Answer 1

当呈现为 json 时，您可以传递一些额外的参数，如http://jonathanjulian.com/2010/04/rails-to_json-or-as_json/

基本示例：

class Api::V1::CarsController < Api::V1::BaseController
  def recent
    recent = Car.most_recent(params[:how_recent])
    comments = recent.each{|r| r.comments} ## ??
    respond_to do |format|
      format.html
      format.json { render recent.as_json(:include => :comments) }
    end
  end
end

Answer 2

comments = Comment.join(:car).merge(Car.most_recent(params[:how_recent]))

如果你想要自定义 json 输出使用rabl gem