Rails JSON_API创建带有类型列表的图书

Question

我正在尝试编写我的测试，以确保创建一个新的book，并将genres分配给它。

我使用的是带有JSON_API结构(http://jsonapi.org/)的活动模型序列化程序

图书模型文件

class Book < ApplicationRecord
  belongs_to :author, class_name: "User"
  has_and_belongs_to_many :genres
end

体裁模型文件

class Genre < ApplicationRecord
  has_and_belongs_to_many :books
end

图书串行化文件

class BookSerializer < ActiveModel::Serializer
  attributes :id, :title, :adult_content, :published

  belongs_to :author
  has_many :genres
end

测试样本数据

def setup
    ...
    @fantasy = genres(:fantasy)

    @newbook = {
      title: "Three Little Pigs",
      adult_content: false,
      author_id: @jim.id,
      published: false,
      genres: [{title: 'Fantasy'}]
    }
end

测试方法

test "book create - should create a new book" do
    post books_path, params: @newbook, headers: user_authenticated_header(@jim)
    assert_response :created
    json = JSON.parse(response.body)
    puts "json = #{json}"
    assert_equal "Three Little Pigs", json['data']['attributes']['title']
    genre_data = json['data']['relationships']['genres']['data']

    puts "genre_data = #{genre_data.count}"
    assert_equal "Fantasy", genre_data
end

书中的强平行曲

def book_params
    params.permit(:title, :adult_content, :published, :author_id, :genres)
end

测试结果(控制台响应)

# Running:

......................................................json = {"data"=>{"id"=>"1018350796", "type"=>"books", "attributes"=>{"title"=>"Three Little Pigs", "adult-content"=>false, "published"=>false}, "relationships"=>{"author"=>{"data"=>{"id"=>"1027431151", "type"=>"users"}}, "genres"=>{"data"=>[]}}}}
genre_data = 0
F

Failure:
BooksControllerTest#test_book_create_-_should_create_a_new_book [/Users/warlock/App_Projects/Raven Quill/Source Code/Rails/raven-quill-api/test/controllers/books_controller_test.rb:60]:
Expected: "Fantasy"
  Actual: []


bin/rails test test/controllers/books_controller_test.rb:51



Finished in 1.071044s, 51.3518 runs/s, 65.3568 assertions/s.

55 runs, 70 assertions, 1 failures, 0 errors, 0 skips

从我的JSON控制台日志中可以看到，我的类型似乎没有被设置(需要在上面的测试输出中向右滚动)。

请忽略这一行：

assert_equal "Fantasy", genre_data

我知道这是不对的。目前，json正在显示genre => {data: []} (空数组)，这是我目前正试图解决的问题。

在这种情况下，我如何创建一本有体裁的书，有什么想法吗？

Answer 1

本周正好是sad...third时间，我正在回答我自己的问题。

我终于从这个堆栈溢出问题中找到了答案：

HABTM association with Strong Parameters is not saving user in Rails 4

原来我的强参数应该是：

def book_params
    params.permit(:title, :adult_content, :published, :author_id, {:genre_ids => []})
end

那么我的测试数据可以是：

@fantasy = genres(:fantasy)

@newbook = {
  title: "Three Little Pigs",
  adult_content: false,
  author_id: @jim.id,
  published: false,
  genre_ids: [@fantasy.id]
}

更新我的测试方法以：

test "book create - should create a new book" do
    post books_path, params: @newbook, headers: user_authenticated_header(@jim)
    assert_response :created
    json = JSON.parse(response.body)
    assert_equal "Three Little Pigs", json['data']['attributes']['title']
    genre = json['data']['relationships']['genres']['data'].first['title']
    assert_equal "Fantasy", genre
end

现在我的测试通过了。