Ruby-on-rails 使用 active_model_serializers 序列化模型数组

Serialize an array of models using active_model_serializers

提问by vipin8169

I am trying to send the serialized version of a model to a view as a param, using the gem active_model_serializers

我正在尝试使用 gem active_model_serializers将模型的序列化版本作为参数发送到视图

#app/serializers/admin_serializer.rb
class AdminSerializer < ActiveModel::Serializer
  attributes :id, :email, :access_locked?
end


#app/controllers/dashboard/admins_controller.rb
  def index
    @search = Admin.search(params[:q])
    @admins = @search.result(:distinct => true).page(params[:page]).per(10)

    @page_entries_info = view_context.page_entries_info @admins
    # render json: @admins
    respond_to do |format|
      format.html
      format.js
      format.json {render json: @admins}
    end
  end



#app/views/dashboard/admins/index.html.erb
  <%= debug (ActiveModel::Serializer::Adapter.adapter_class(:json_api).new(ActiveModel::Serializer.serializer_for(@admins.first).new(@admins.first),{}).to_json) %>
  <%= debug (@admins.all.map{|admin| AdminSerializer.new(admin).to_json}) %>

Above debugs are yielding the below response:

以上调试产生以下响应：

--- '{"data":{"id":"1","type":"admins","attributes":{"email":"[email protected]","access_locked?":false}}}' //returned by the first debug


---
- '{"object":{"id":36,"email":"[email protected]","created_at":"2016-03-28T05:15:17.546Z","updated_at":"2016-03-28T05:15:17.546Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":20,"email":"[email protected]","created_at":"2016-03-28T05:15:16.304Z","updated_at":"2016-03-28T05:15:16.304Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":22,"email":"[email protected]","created_at":"2016-03-28T05:15:16.459Z","updated_at":"2016-03-28T05:15:16.459Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":37,"email":"[email protected]","created_at":"2016-03-28T05:15:17.624Z","updated_at":"2016-03-28T05:15:17.624Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":5,"email":"[email protected]","created_at":"2016-03-28T05:15:15.139Z","updated_at":"2016-03-28T05:15:15.139Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":14,"email":"[email protected]","created_at":"2016-03-28T05:15:15.838Z","updated_at":"2016-03-28T05:15:15.838Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":27,"email":"[email protected]","created_at":"2016-03-28T05:15:16.848Z","updated_at":"2016-03-28T05:15:16.848Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":2,"email":"[email protected]","created_at":"2016-03-28T05:15:14.873Z","updated_at":"2016-03-28T05:15:14.873Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":10,"email":"[email protected]","created_at":"2016-03-28T05:15:15.527Z","updated_at":"2016-03-28T05:15:15.527Z"},"instance_options":{},"root":null,"scope":null}'
- '{"object":{"id":15,"email":"[email protected]","created_at":"2016-03-28T05:15:15.916Z","updated_at":"2016-03-28T05:15:15.916Z"},"instance_options":{},"root":null,"scope":null}'

In the first debug I am serializing only one object, while in the second one I am trying to do it for an array of objects. The first debug is correctly returning the serialized version of the object(in json_api format) while second debug is not. Tried ArraySerializer as well, with no success: ActiveModel::Serializer::ArraySerializer.new(@admins, each_serializer: AdminSerializer).as_jsonhow do I achieve the desired serialization. Moreover, if achieved, can I used some other simplified version of this? As this debug statement is way too verbose.

在第一个调试中，我只序列化一个对象，而在第二个调试中，我试图对一组对象进行序列化。第一个调试正确返回对象的序列化版本（以 json_api 格式），而第二个调试则没有。也尝试了 ArraySerializer，但没有成功：ActiveModel::Serializer::ArraySerializer.new(@admins, each_serializer: AdminSerializer).as_json我如何实现所需的序列化。此外，如果实现了，我可以使用其他一些简化版本吗？因为这个调试语句太冗长了。

Tried all the solutions mentioned here - How do you initialize an ActiveModel::Serializer class with an ActiveRecord::Relation array?

尝试了这里提到的所有解决方案 -如何使用 ActiveRecord::Relation 数组初始化 ActiveModel::Serializer 类？

The basic problem which I am trying to solve is, in the index method of the Admin controller, the Admin object is passed as a PORO to the index.html file. But I want the serialized json version of this object so that I can pass it to my react components as a prop

我试图解决的基本问题是，在 Admin 控制器的 index 方法中，Admin 对象作为 PORO 传递给 index.html 文件。但我想要这个对象的序列化 json 版本，以便我可以将它作为道具传递给我的反应组件

index method is rendering proper json on firing http://dashboard.localhost.com:3000/admins.json

index 方法在触发http://dashboard.localhost.com:3000/admins.json 时呈现正确的 json

UPDATE#1for the index method

索引方法的更新#1

def index
    @search = Admin.search(params[:q])
    @admins_array = @search.result(:distinct => true).to_a
    if params[:page]
      @admins = @search.result(:distinct => true).page(params[:page][:number]).per(10)
      @admins_json_array = Kaminari.paginate_array(@admins_array).page(params[:page][:number]).per(10)
    else
      @admins = @search.result(:distinct => true).page(1).per(10)
      @admins_json_array = Kaminari.paginate_array(@admins_array).page(1).per(10)
    end
    @admins_json = ActiveModel::SerializableResource.new(@admins_json_array.to_a)
    ...
    ...
    ...
end

回答by NullVoxPopuli

I have a controller that I need to specify the serializer in, due to wanting different attributes from the default serializer.

我有一个控制器，我需要在其中指定序列化程序，因为需要与默认序列化程序不同的属性。

In Controller:

在控制器中：

  def index
    search = User.ransack(search_params)
    render json: search.result, each_serializer: MembershipRenewalSerializer::MemberSerializer
  end

So, just to get things working, what happens if you specify the each_serializeroption?

所以，只是为了让事情工作，如果你指定each_serializer选项会发生什么？

Edits:

编辑：

Outside Controller:

外部控制器：

ActiveModel::SerializableResource.new(
  User.first(2), 
  each_serializer: MembershipRenewalSerializer::MemberSerializer
).to_json

Note, that without specifying each_serializer, SerializableResourcewould use the UserSerializer.

请注意，如果不指定each_serializer，SerializableResource将使用UserSerializer.

Edit #2,

编辑#2，

It looks like there is something weird happening with the @admins data.

@admins 数据似乎发生了一些奇怪的事情。

Try converting to an array:

尝试转换为数组：

ActiveModel::SerializableResource.new(@admins.to_a).to_json 

Edit #3

编辑 #3

To paginate your array, try the following:

要对数组进行分页，请尝试以下操作：

@search = Admin.search(params[:q])
@results = @search.result(:distinct => true).to_a
@admins = Kaminari.paginate_array(@results).page(params[:page]).per(10)

回答by abookyun

Follow the guide: Serializing before controller render

遵循指南：在控制器渲染之前序列化

You could use ActiveModel::SerializableResource.new(@admins, adapter: :json_api).to_json

你可以用 ActiveModel::SerializableResource.new(@admins, adapter: :json_api).to_json

in index.html.erb

在 index.html.erb

<%= debug (ActiveModel::SerializableResource.new(@posts, adapter: :json_api).to_json) %>

below is the output(using posts)

下面是输出（使用帖子）

'{"data":[{"id":"1","type":"posts","attributes":{"title":"first post","body":null}},{"id":"2","type":"posts","attributes":{"title":"second post","body":null}}],"links":{}}

回答by ZZ4

I create a concern with some API helper methods and there you can check if its a collection pass find the appropiate serializer and pass it to the collection serializer.

我对一些 API 帮助程序方法产生了关注，您可以在那里检查它的集合传递是否找到了合适的序列化程序并将其传递给集合序列化程序。

def api_response(data)
  render json: wrap_answer(data)
end

def wrap_answer(data)
  if data.respond_to?(:each)
    ActiveModel::Serializer::CollectionSerializer.new(data, each_serializer: ActiveModel::Serializer.serializer_for(data.first))
  else
    data
  end
end