How to render deeply nested associations to json using serializer in rails? - ruby-on-rails

Question

I am just working on a simple rails project in which the models have these many relationships between them :
A author can have many posts
A post can have many comments
likes and dislikes belongs to each post
Now, I have rendered the authors data ( in json ) and the output which I am getting is this :
As we can say that it is rendering only author and post data ( neither comments nor likes/dislikes ).
I am very new to RubyOnRails. So, Whatever I have tried so far is this below :
Controller :
class AuthorsController < ApplicationController
def show
#auth = Author.find_by(id: params[:id])
render json: #auth
end
end
Models :
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
Serializers :
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
schema.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
Now, I just want to render complete data of a author ( Means, The expected output must include author detail + post details + comments + likes + dislikes ) in json form.
I have searched a lot to overcome this issue, but could not resolve this issue.

Answer 1

You need to make 2 changes in your code -
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