Aktive Modell Serilazer gibt Standard-JSON-Objekt

Question

Ich habe eine aktives Modell Serializer Klassen wie diese

class PostSerializer < ActiveModel::Serializer 
attributes :activities 
def activities 
    object.activities.each do |activity| 
     post_json(activity) if activity.class.name == 'Post' 
     like_json(activity) if activity.class.name == 'PostLike' 
     comments_json(activity) if activity.class.name == 'PostComment' 
    end 
    end 

    def post_json(post) 
    { 
     type: 'share', 
     user: post.user_id, 
     user_name: post.user.display_name, 
     user_image_thumb: post.user.profile.image.thumb.url, 
     id: post.id, 
     created_at: post.created_at 
    } if post 
    end 

    def like_json(like) 
    { 
     type: 'like', 
     user: like.user_id, 
     user_name: like.user.display_name, 
     user_image_thumb: like.user.profile.image.thumb.url, 
     id: like.id, 
     created_at: like.created_at 
    } if like 
    end 

    def comments_json(comment) 
    { 
     type: 'comment', 
     user: comment.user_id, 
     user_name: comment.user.display_name, 
     user_image_thumb: comment.user.profile.image.thumb.url, 
     id: comment.id, 
     created_at: comment.created_at, 
     content: comment.content 
    } if comment 
    end 
end 

Aber die Antwort liefert immer das Standardantwortobjekt und enthält doesnot die Felder aus den json-Generator-Methoden.

"activities": [ 
     { 
     "id": 40, 
     "user_id": 22, 
     "post_id": 8, 
     "created_at": "2016-04-22T07:29:26.210Z", 
     "updated_at": "2016-04-22T07:29:26.210Z" 
     } 
] 

Wie kann ich das beheben?

Answer 1

ändern each zu map:

def activities 
    object.activities.map do |activity| 
     post_json(activity) if activity.class.name == 'Post' 
     like_json(activity) if activity.class.name == 'PostLike' 
     comments_json(activity) if activity.class.name == 'PostComment' 
    end 
    end 

Array#each vs. Array#map