ActiveModel::Serializer not used when rendering JSON - ruby-on-rails

Question

I am having an issue with Serializers in Rails. I'm trying to render custom json for my models. To do so, I added active_model_serializer to my Gemfile and wrote some Serializers. The problem is that when I'm rendering JSON, it is rendering my whole object instead of calling the serializer.
Here is my code
User Serializer
class UserSerializer < ActiveModel::Serializer
attributes :id, :email
end
User Model
# Class model for users
class User < ActiveRecord::Base
...
end
Response Model
class Response
attr_accessor :status, :data
end
Show Method
def send_response(*args)
r = Response.new
r.status = args[0] # This is the HTTP code
r.data = args[1] # This is a user object
render json: r, status: r.status
end
Gemfile
source 'https://rubygems.org'
gem 'rails', '4.2.0'
gem 'pg'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
gem 'devise'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc
gem 'omniauth'
gem 'active_model_serializers'
group :development, :test do
gem 'byebug'
gem 'web-console', '~> 2.0'
gem 'spring'
end

Answer 1

You would have to create a serializer for Response as well. When you pass a plain object to render json: it will just try to call .to_json on the object. It has no idea that serializers even exist for nested objects.
class ResponseSerializer < ActiveModel::Serializer
attributes :title, :body
belongs_to :user
end
--
def send_response(*args)
r = Response.new
r.status = args[0] # This is the HTTP code
r.data = args[1] # This is a user object
render json: r, status: r.status
end