Rails Ember 强参数说明

Question

如果我有一个 Book 实体和一个 Chapter 实体，我的 chapters_controller 的强参数应该是什么？

注：我用的是JSONAPI.

在我的chapters_controller中，我的强参数应该是：

:title, :order, :content, :published, :book, :picture

或者应该是：

:title, :order, :content, :published, :book_id, :picture

如果我使用:book而不是:book_id，那么在我的Ember应用程序中，当我去创建一个新章节时，我能够创建它并关联这个章节到父书，但是，我的测试失败了：

def setup
  @book = books(:one)

  @new_chapter = {
    title: "Cooked Wolf Dinner",
    order: 4,
    published: false,
    content: "The bad wolf was very mad. He was determined to eat the little pig so he climbed down the chimney.",
    book: @book
  }
end

def format_jsonapi(params)
  params = {
    data: {
      type: "books",
      attributes: params
    }
  }
  return params
end

...

test "chapter create - should create new chapter assigned to an existing book" do
  assert_difference "Chapter.count", +1 do
    post chapters_path, params: format_jsonapi(@new_chapter), headers: user_authenticated_header(@jim)
    assert_response :created

    json = JSON.parse(response.body)

    attributes = json['data']['attributes']

    assert_equal "Cooked Wolf Dinner", attributes['title']
    assert_equal 4, attributes['order']
    assert_equal false, attributes['published']
    assert_equal @book.title, attributes['book']['title']
  end
end

我的控制台出现错误，提示关联类型不匹配。

也许我的台词是：

book: @book

是它的原因吗？

不管怎样，直觉告诉我应该在 chapters_controller 强参数中使用 :book。

只是我的测试没有通过，我不确定如何编写参数散列以使我的测试通过。

Answer 1

经过几个小时的努力并查看 JSON API 文档：

http://jsonapi.org/format/#crud-creating

我注意到了，为了使用 JSON API 设置与实体的 belongsTo 关系，我们需要这样做：

POST /photos HTTP/1.1
Content-Type: application/vnd.api+json
Accept: application/vnd.api+json

{
  "data": {
    "type": "photos",
    "attributes": {
      "title": "Ember Hamster",
      "src": "http://example.com/images/productivity.png"
    },
    "relationships": {
      "photographer": {
        "data": { "type": "people", "id": "9" }
      }
    }
  }
}

这也让我解决了另一个我过去无法解决的问题。可以创建多种类型的书籍。

JSON API 结构，用于将 Genre 的数组分配给 Book 实体，我们在关系部分用数据数组替换数据哈希，如这个：

"data": [
    { "type": "comments", "id": "5" },
    { "type": "comments", "id": "12" }
]

另外，在我的控制器中，任何像这样的强参数：

:title, :content, genre_ids: []

变成

:title, :content, :genres

遵守JSONAPI.

所以对于我的新测试样本数据，我现在有：

def setup
  ...
  @new_chapter = {
    title: "Cooked Wolf Dinner",
    order: 4,
    published: false,
    content: "The bad wolf was very mad. He was determined to eat the little pig so he climbed down the chimney.",
  }
  ...
end

def format_jsonapi(params, book_id = nil)
  params = {
    data: {
      type: "chapters",
      attributes: params
    }
  }

  if book_id != nil
    params[:data][:relationships] = {
      book: {
        data: {
          type: "books",
          id: book_id
        }
      }
    }
  end

  return params
end

关于关系设置的特别说明-只有在有关系的情况下才将relationships添加到params，否则，将其设置为nil就是告诉JSON API到删除该关系，而不是忽略它。

然后我可以像这样调用我的测试：

test "chapter create - should create new chapter assigned to an existing book" do
  assert_difference "Chapter.count", +1 do
  post chapters_path, params: format_jsonapi(@new_chapter, @book.id), headers: user_authenticated_header(@jim)
  assert_response :created

  json = JSON.parse(response.body)

  attributes = json['data']['attributes']

  assert_equal "Cooked Wolf Dinner", attributes['title']
  assert_equal 4, attributes['order']
  assert_equal false, attributes['published']
  assert_equal @book.id, json['data']['relationships']['book']['data']['id'].to_i
end

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