如何在使用ActiveModel :: Serializer時隱藏created_at和updated_at

Question

我在rails應用程序中使用active_model_serializers它工作得很好，但是在處理關聯時，它將返回關聯模型的所有屬性（包括created_at和updated_at）我不想被退回。

class ReservationSerializer < ActiveModel::Serializer 
attributes :id, :pnr_no, :train_no, :passenger_name, :from_to, 
:travel_class, :cancelled, :travel_time 
has_many :reservation_seats 
end 

... 
attributes of reservation are returned, which are fine therefore only 
including the relationship attributes i.e for reservation_seats 
... 

"relationships": { 
    "reservation-seats": { 
     "data": [ 
     { 
      "id": 4, 
      "reservation-id": 5, 
      "seat-no": "26", 
      "position" : "2", 
      "created-at": "2017-05-27T23:59:56.000+05:30", 
      "updated-at": "2017-05-27T23:59:56.000+05:30" 
     } 
     ] 
    } 

我試着創建一個新文件，以及我已經定義了需要返回的屬性，但在這種情況下，它只是返回類型而已。

class ReservationSeatSerializer < ActiveModel::Serializer 
    attributes :id, :seat_no, :position 
    belongs_to :reservation 
end 

這導致：

"relationships": { 
    "reservation-seats": { 
     "data": [ 
     { 
      "id": "4", 
      "type": "reservation-seats" 
     } 
     ] 
    } 
    } 

基本上爲聯想，我只想要返回幾個屬性。

感謝

Answer 1

的JSON API SPEC希望您只包括關係的類型和標識，以減少響應數據和數據庫的請求。如果您想要包括相關的對象，你必須包括它：

ActiveModelSerializer例子：

render json: @reservation, include: '*' 

這包括所有的關係遞歸。這些相關對象將以included陣列結尾。請看JSON API spec和active_model_serializer docs。

Answer 2

你可以試着將你的協會的串行它裏面：

class ReservationSerializer < ActiveModel::Serializer 
    attributes :id, :pnr_no, :train_no, :passenger_name, :from_to, 
    :travel_class, :cancelled, :travel_time 
    has_many :reservation_seats 

    class ReservationSeatSerializer < ActiveModel::Serializer 
    attributes :id, :seat_no, :position 
    end 
end