Ruby on Rails加入JSON输出模型 [英] Ruby on Rails joins models for json output

问题描述

我正在尝试使用Ruby on Rails构建JSON API端点。

I'm trying to build a JSON API end point with Ruby on Rails.

我按照以下说明进行操作，并能够为我的模型
创建JSON API http://railscasts.com/episodes/350-rest-api-versioning?view=comments/

I followed the instruction in the following and was able to create JSON API for my models http://railscasts.com/episodes/350-rest-api-versioning?view=comments/

我有以下控制器：

/api/v1/movies_controller.rb

/api/v1/movies_controller.rb

class MoviesController < ApplicationController
  def index
    if params[:p].nil?
      p = 1
    else
      p = params[:p].to_i
    end

    @movies = Movie.order("id DESC").page(p)
  end

  def show
    @movie = Movie.find(params[:id])
  end
end

我需要将其与流派对象一起加入，其中Movie has_many：genres和流派属于_movie

I need to join this with the Genre object where Movie has_many :genres, and Genre belongs_to :movie

但是，我无法使用以下内容将流派与电影对象结合在一起以用于JSON输出：

However, I'm not able to use the following to get the genres joined with the movie object for the JSON output:

@movie = Movie.find(params[:id], :joins => :genres)

我确实注意到以下命令能够在ruby控制台中生成合并的输出

I did notice that the following command is able to generate the joined output in ruby console

@movie.to_json(:include=>:genres)

但是在控制器中添加它不会t显示其他类型字段

But then adding this in the controller doesn't show the additional genres fields

有人可以帮我吗？

谢谢！

推荐答案

我的adv ise：使用 active_model_serializers

My advise: Go with active_model_serializers

将以下行添加到您的Gemfile

Add the following line to your Gemfile

gem 'active_model_serializers'

执行捆绑安装。

在那之后执行

rails g serializer movie
rails g serializer genre

比自定义以下代码：

/api/v1/movies_controller.rb

class MoviesController < ApplicationController
  respond_to :json

  def index
    if params[:p].nil?
      p = 1
    else
      p = params[:p].to_i
    end

    @movies = Movie.order("id DESC").page(p)

    respond_with @movies
  end

  def show
    @movie = Movie.find(params[:id])

    respond_with @movie
  end
end

应用/serializers/movie_serializer.rb

class MovieSerializer < ActiveModel::Serializer
  embed :ids, :include => true

  attributes :id, :name
  has_many :genres
end

app / serializers / genre_serializer.rb

class GenreSerializer < ActiveModel::Serializer
  embed :ids, :include => true

  attributes :id, :name
end

有在
中查看 active_model_serializers 的完整文档 https://github.com/rails-api/active_model_serializers

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