ruby-on-rails - 如何使用 rails 中的序列化程序将深层嵌套的关联渲染到 json？

Question

我只是在做一个简单的 Rails 项目，其中模型之间有很多关系:

1. 一个作者可以有多个帖子
2. 一个帖子可以有很多评论
3. 喜欢和不喜欢属于每个帖子

现在，我已经渲染了作者数据(在 json 中)，我得到的输出是这样的:

我们可以说它只呈现作者和帖子数据(既不评论也不喜欢/不喜欢)。

我是 RubyOnRails 的新手。所以，到目前为止，无论我尝试过什么，都在下面:

Controller :

class AuthorsController < ApplicationController
    def show
        @auth = Author.find_by(id: params[:id])
        render json: @auth
    end
end

模型:

class Author < ApplicationRecord
    has_many :posts
end

class Comment < ApplicationRecord
    belongs_to: post
end

class Dislike < ApplicationRecord
    belongs_to: post
end

class Like < ApplicationRecord
    belongs_to: post
end

class Post < ApplicationRecord
    has_many :comments
end

序列化器:

class AuthorSerializer < ActiveModel::Serializer
  attributes :id, :name, :age
  has_many :posts
end

class CommentSerializer < ActiveModel::Serializer
  attributes :id, :content, :username
end

class DislikeSerializer < ActiveModel::Serializer
  attributes :id, :dislikecount
end

class LikeSerializer < ActiveModel::Serializer
  attributes :id, :likecount
end

class PostSerializer < ActiveModel::Serializer
  attributes :name, :content
  has_many :comments, serializer: CommentSerializer  
end

架构.rb:

ActiveRecord::Schema.define(version: 2020_03_25_091544) do

  # These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"

  create_table "authors", force: :cascade do |t|
    t.string "name"
    t.integer "age"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
  end

  create_table "comments", force: :cascade do |t|
    t.string "content"
    t.string "username"
    t.bigint "post_id"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.index ["post_id"], name: "index_comments_on_post_id"
  end

  create_table "dislikes", force: :cascade do |t|
    t.integer "dislikecount"
    t.bigint "post_id"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.index ["post_id"], name: "index_dislikes_on_post_id"
  end

  create_table "likes", force: :cascade do |t|
    t.integer "likecount"
    t.bigint "post_id"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.index ["post_id"], name: "index_likes_on_post_id"
  end

  create_table "posts", force: :cascade do |t|
    t.string "name"
    t.string "content"
    t.bigint "author_id"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.index ["author_id"], name: "index_posts_on_author_id"
  end

end

现在，我只想以 json 形式呈现作者的完整数据(意味着，预期输出必须包括作者详细信息+帖子详细信息+评论+喜欢+不喜欢)。

我已经进行了很多搜索来解决这个问题，但无法解决这个问题。

Answer 1

您需要对代码进行 2 处更改 -

class Post < ApplicationRecord
  has_many :comments
  has_many :likes
  has_many :dislikes
  belongs_to :author
end

class PostSerializer < ActiveModel::Serializer
  attributes :name, :content
  has_many :comments, serializer: CommentSerializer
  has_many :likes
  has_many :dislikes  
end