0

我创建了这段代码来向用户显示特定的错误消息：

application_controller.rb

class ApplicationController < ActionController::Base
  rescue_from Exception do |exception|
    message = exception.message
    message = "default error message" if exception.message.nil?

    render :text => message
  end
end

room_controller.rb

class RoomController < ApplicationController
  def show
    @room = Room.find(params[:room_id]) # Can throw 'ActiveRecord::RecordNotFound'
  end

  def business_method
    # something
    raise ValidationErros::BusinessException("You cant do this") if something #message "You cant do this" should be shown for user
    #...
  end

  def business_method_2
    Room.find(params[:room_id]).do_something
  end
end

房间.rb

class Room < ActiveRecord::Base
  def do_something
    #...
    raise ValidationErrors::BusinessException("Invalid state for room") if something #message "Invalid state for room" should be shown for user
    #...
  end
end

应用程序/模型/错误/validation_errors.rb

module ValidationErrors
  class BusinessException < RuntimeError
    attr :message
    def initialize(message = nil)
      @message = message
    end
  end
end

例子.js

$.ajax({
        url: '/room/show/' + roomId,
        success: function(data){
            //... do something with data
        },
        error: function(data){
            App.notifyError(data) //show dialog with message
        }
    });

但我不能使用 BusinessException 类。当应引发 BusinessException 时，消息

未初始化的常量 Room::ValidationErrors

显示给用户。

如果我更改此代码：

raise ValidationErrors::BusinessException("Invalid state for room") if something

这样：

raise "Invalid state for room" if something

有用。

此代码的哪些更改适用于带有消息的 BusinessException。我需要这个来rescue_from在 ApplicationController 中创建具体的方法。

编辑：

感谢您的评论！我的错误是它不知道 ValidationErrors 模块。如何将此模块导入我的班级？

我已经测试将这些行添加到行中：

require 'app/models/errors/validation_errors.rb'

require 'app/models/errors/validation_errors'

但随后引发错误：

cannot load such file -- app/models/errors/validation_errors

解决方案：

https://stackoverflow.com/a/3356843/740394

config.autoload_paths += %W(#{config.root}/app/models/errors)
4

1 回答 1

0 
raise ::ValidationErrors::BusinessException("Invalid state for room")
于 2012-07-05T04:23:09.757 回答