Rails Controller / Serializer / Service

some-controller.rb

class Controller
  def create
    outcome = Services::SomeCreation.new(params).call
    return render_json Serializers::SomeSerializer(outcome,  DEFAULT_STATUS_CODE).to_h
  end
end

some-creation.rb

module Services
  class SomeCreation
    def initialize(params)
      @params = params
    end
    
    def call
      # Do fuzzy business logic here.
      instance = SomeModel.new(@params)
      (instance.save) ? instance : false
    end
  end
end

some-serializer.rb

module Serializers
  class SomeSerializer(item)
    @item = item
    @body = Jbuilder.new
    build
  end
  
  def to_h
    return error_hash if item == false
    success_hash
  end
  
  private
  
  def error_hash
    { body: {}, status: ERROR_CODE }
  end
  
  def success_hash
    { body: @body, status: (@item.new_record?) ? 201 : 200 }
  end
  
  def build
    @body.data do |data|
      data.id @item.id
    end
    @body.meta {}
  end
end