gistfile1.rb

  def render_error(options={})
    errors = options[:error] || ''
    message = options[:message] || ''
    action = options[:action] || ''
    render json: {errors:{ errors: errors, message: message, action: action}}, status: 422
  end

  def render_success(options={})
    action = options[:action] || ''
    render json: {action: action}
  end

  def require_login
    unless signed_in?
      render_error(message: 'not logged in')
    end
  end

#error response: {"errors":{"errors":"","message":"not logged in","action":""}}
#success response: {"action":"created"}

looks good