Action Cable Rails 出现错误“RuntimeError - 无法找到带有标识符的订阅”答案

【问题标题】：Action Cable Rails got error " RuntimeError - Unable to find subscription with identifier"Action Cable Rails 出现错误“RuntimeError - 无法找到带有标识符的订阅”
【发布时间】：2018-11-03 17:02:16
【问题描述】：

我使用动作电缆在 Rails 中创建了一个套接字 API。然后我使用 chrome 插件发送测试请求。我收到了这个错误：

成功升级到 WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION：升级，HTTP_UPGRADE：websocket）无法执行命令来自 ({"command"=>"message", "data"=>"{}", "标识符"=>"{\"channel\":\"ApiChannel\"}"}) [RuntimeError - 无法查找带有标识符的订阅：{"channel":"ApiChannel"}]： /home/lin/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/actioncable-5.1.5/lib/action_cable/connection/subscriptions.rb:76:in find' | /home/lin/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/actioncable-5.1.5/lib/action_cable/connection/subscriptions.rb:53:inperform_action' | /home/lin/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/actioncable-5.1.5/lib/action_cable/connection/subscriptions.rb:17:in execute_command' | /home/lin/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/actioncable-5.1.5/lib/action_cable/connection/base.rb:85:indispatch_websocket_message' | /home/lin/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/actioncable-5.1.5/lib/action_cable/server/worker.rb:58:in `调用中的阻塞'

这是我的频道：

class MessagesChannel < ApplicationCable::Channel
  def subscribed
     stream_from "messages"
  end

  def unsubscribed
    # Any cleanup needed when channel is unsubscribed
  end

  def chat data
      Message.create! content: data['content']
      ActionCable.server.broadcast 'messages',
        message: message.content
  end
end

如果您对此有任何经验，请帮助我找到解决方案。

【问题讨论】：

标签： ruby-on-rails

【解决方案1】：

你的错误说：

Unable to find subscription with identifier: {"channel":"ApiChannel"}]

从那以后，因为您的代码示例显示它被称为MessagesChannel

您是否尝试过更改您的请求？

【讨论】：