ruby - ActiveModel::Serializer::CollectionSerializer

Question

我正在使用 Active Model Serializers v0.10.0.rc4

我想生成如下所示的 json:

{
  "posts": [
    { "post": {"id": 2, "name": "foo"} },
    { "post": {"id": 3, "name": "bar"} }
  ],
  "next_page": 3
}

我知道基本的:

render json: posts, each_serializer: PostSerializer

将生成这样的 json:

[
  {"id": 2, "name": "foo"}
  {"id": 3, "name": "bar"}
]

我尝试了以下操作:

Controller :

render json: posts, serializer: PostsSerializer

posts_serializer:

class PostsSerializer < ActiveModel::Serializer
  attributes :posts, :next_page

  def posts
    ActiveModel::Serializer::CollectionSerializer.new(object,
      each_serializer: PostSerializer,
      root: "post"
    )
  end

  def next_page
    3 
  end
end

但这会产生这样的 json:

{
  "posts": [
    {
      "object": {"id": 2, "name": "foo"},
      "instance_options": {"each_serializer: {}", "root": "post" }
    },
    {
      "object": {"id": 3, "name": "bar"},
      "instance_options": {"each_serializer: {}", "root": "post" }
    },
  ],
  "next_page": 3
}

有人知道我如何才能实现所需的架构吗？

Answer 1

最后我没有使用CollectionSerializer。这就是我使用的:

Controller :

render json: posts, serializer: PostsSerializer

posts_serializer:

class PostsSerializer < ActiveModel::Serializer
  attributes :posts, :next_page

  def posts
    object.map do |p|
      ActiveModel::SerializableResource.new(p, adapter: :json)
    end
  end

  def next_page
    # todo
  end
end

指定 json 适配器可确保 post 元素具有所需的根节点。

虽然我很欣赏为数组项指定根节点可能不是常规的，但此 api 需要它。