gistfile1.rb

  self.include_root_in_json = false

  def export
    json = to_json(:include => [:door_profile, :door_lift, :door_hinge, :door_handle, :door_glass], :except => [:created_at, :updated_at, :door_id, :id, :order_id, :user_id])
    attributes = ActiveSupport::JSON.decode(json)
    %w[door_profile door_lift door_hinge door_handle door_glass].each do |v|
      if attributes[v]
        attributes["#{v.to_s}_attributes"] = attributes[v]
        attributes.delete(v)
      end
    end
    ActiveSupport::JSON.encode(attributes)
  end