在 ActionCable 中找不到订阅类“MyChannel”

Posted 2023-02-15

【中文标题】在 ActionCable 中找不到订阅类“MyChannel”

【英文标题】：Subscription class not found 'MyChannel' in ActionCable

【发布时间】：2017-11-13 04:26:45

【问题描述】：

我在使用 Action Cable 时遇到了一个问题，每当我运行我的程序时，我都会收到一条错误消息：Subscription Class not found ConversationChannel

当我尝试发送消息时，我会收到此日志

成功升级到 WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: 升级, HTTP_UPGRADE: websocket) 订阅类 未找到：“ConversationChannel”无法执行来自的命令 “命令”=>“消息”， "标识符"=>"\"频道\":\"ConversationChannel\"", "data"=>"\"message\":[\"name\":\"conversation_id\",\"value\":\"2\",\"name\":\"amitian_id \",\"value\":\"1\",\"name\":\"body\",\"value\":\"nmm\"],\"action\":\ “说话\””） [RuntimeError - 无法找到带有标识符的订阅： “频道”：“对话频道”]： C:/RailsInstaller/Ruby2.3.​​0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.1/lib/action_cable/connection/subscriptions.rb:74:in find' | C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.1/lib/action_cable/connection/subscriptions.rb:53:in perform_action' | C:/RailsInstaller/Ruby2.3.​​0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.1/lib/action_cable/connection/subscriptions.rb:17:in execute_command' | C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.1/lib/action_cable/connection/base.rb:88:indispatch_websocket_message' | C:/RailsInstaller/Ruby2.3.​​0/lib/ruby/gems/2.3.0/gems/actioncable-5.0.1/lib/action_cable/server/worker.rb:58:in `调用中的阻塞'

ConversationChannel.rb

class ConversationChannel < ApplicationCable::Channel
  def subscribed
    # stream_from "some_channel"
    stream_from "conversations-#current_amitian.id"
  end

  def unsubscribed
    # Any cleanup needed when channel is unsubscribed
    stop_all_streams
  end

  def speak(data)

    message_params = data['message'].each_with_object() do |el, hash|
      hash[el.values.first] = el.values.last
    end

    ActionCable.server.broadcast(
      "conversations-#current_amitian.id",
      message: message_params
    )
  end 
 end

conversation.js

App.conversation = App.cable.subscriptions.create("ConversationChannel", 
  connected: function() 

  ,
  disconnected: function() 

  ,
  received: function(data) 
  console.log(data['message']);
  ,
  speak: function(message) 
    return this.perform('speak' , 
    message: message
    );
  
);

$(document).on('submit', '.new_message', function(e) 
  e.preventDefault();
  var values = $(this).serializeArray();
  App.conversation.speak(values);
  $(this).trigger('reset');
);

连接.rb

module ApplicationCable
  class Connection < ActionCable::Connection::Base
    identified_by :current_amitian

    def connect
        self.current_amitian = find_verified_amitian
    end

    protected

    def find_verified_amitian
        if(current_amitian = env['warden'].amitian)
            current_amitian
        else
            reject_unauthorized_connection
        end
    end
  end
end

使用上面给出的日志文件谁能告诉我为什么找不到我的conversation_channel.rb 文件？

【参考方案1】：

我已经通过将频道文件上移一个目录解决了这个问题。

来自app/channels/application_cable/conversation_channel.rb 给app/channels/conversation_channel.rb

【参考方案2】：

您必须在客户端 (JS) 代码中提供完整的 Module::Class 名称。例如如果您的 ConversationChannel 类在 ApplicationCable 模块中，那么在您的客户端中，而不仅仅是 ConversationChannel 您需要执行 ApplicationCable::ConversationChannel

【讨论】：

我发现我还需要包含 Channel 类：ApplicationCable::Channel::CountsChannel

【参考方案3】：

您的文件需要命名为conversation_channel.rb，因为snake_case 是通道文件名的rails 约定。

【讨论】：

在您的帖子中您提到您的文件名为ConversationChannel.rb。不是这样吗？检查文件名中是否有任何拼写错误？