ActionCable -响应错误

Question

使用ActionCable，如何在从客户端接收数据后响应错误？

例如，当客户端身份验证失败时，ActionCable抛出UnauthorizedError，后者以404作为响应。例如，当客户端发送的数据无效时，我希望使用422进行响应。

Answer 1

ActionCable.server.broadcast "your_channel", message: {data: data, code: 422}

然后在your.coffee文件中：

received: (res) ->
  switch res.code
    when 200
      # your success code
      # use res.data to access your data message
    when 422
      # your error handler

Answer 2

据我所知，没有"Rails方法“可以做到这一点，@Viktor给出的答案似乎是正确的。总结:确保所有消息都是带数据和带代码的广播，然后在客户端按代码切换。

有关更现代的ES6示例，请参见以下内容：

在rails中：

require 'json/add/exception'

def do_work
  // Do work or raise
  CampaignChannel.broadcast_to(@campaign, data: @campaign.as_json, code: 200)
rescue StandardError => e
  CampaignChannel.broadcast_to(@campaign, data: e.to_json, code: 422) # Actually transmitting the entire stacktrace is a bad idea!
end

在ES6中：

campaignChannel = this.cable.subscriptions.create({ channel: "CampaignChannel", id: campaignId }, {
  received: (response) => {
    const { code, data } = response

    switch (code) {
      case 200:
        console.log(data)
        break
      default:
        console.error(data)
    }
  }
})