ams_without_amserialization.rb

require 'active_model'
require 'active_model_serializers'

class BaseModel
  # provides self.model_name
  include ActiveModel::Model

  attr_accessor :id, :updated_at

  def cache_key
    "#{self.class.name.downcase}/#{self.id}-#{self.updated_at.strftime("%Y%m%d%H%M%S%9N")}"
  end

  def read_attribute_for_serialization(name)
    send(name)
  end
end


class Post < BaseModel
  attr_accessor :name, :author_name
end

class PostSerializer < ActiveModel::Serializer
  attributes :id, :name, :author

  def author
    object.author_name
  end
end

post = Post.new
post.id = 1
post.name = 'PORO AMS'
post.author_name = 'NVP'
resource = ActiveModel::SerializableResource.new(post, adapter: :json)
puts resource.serializable_hash # => {:post=>{:id=>1, :name=>"PORO AMS", :author=>"NVP"}}