jam-cloud/app/responders/api_responder.rb

class ApiResponder < ActionController::Responder
  def to_format
    case
      when has_errors?
        controller.response.status = :unprocessable_entity
      when post?
        controller.response.status = :created
    end

    default_render
  rescue ActionView::MissingTemplate => e
    api_behavior(e)
  end
end