ActionCable:如何使用动态频道 [英] ActionCable: How to use dynamic channels

问题描述

我用 Rails 5 和 ActionCable 建立了一个简单的聊天，我有一个简单的聊天"频道.

I have built a simple chat with Rails 5 and ActionCable where i have one simple "chat" channel.

如何使频道订阅和消息广播动态化，以便我可以创建聊天频道并将消息发送到正确的频道?

How can i make the channel subscription and message broadcasting dynamic, so i can create chat channels and have the messages go to the right channels?

不幸的是，我找不到这样的单个代码示例.

I cannot find a single code example of this unfortunately.

更新

下面的答案是正确的.我还发现它现在在 Rails 指南中提到了.不要认为它在 http://edgeguides.rubyonrails.org 之前就在那里/action_cable_overview.html#client-server-interactions-subscriptions

The answer below is correct. I also found it now mentioned in the rails guide. Don't think it was there before http://edgeguides.rubyonrails.org/action_cable_overview.html#client-server-interactions-subscriptions

推荐答案

在 javascripts/channels/room.js 中为您的订阅创建传递一个 roomId:

Pass a roomId on your subscription creation in javascripts/channels/room.js:

MakeMessageChannel = function(roomId) {
  // Create the new room channel subscription
  App.room = App.cable.subscriptions.create({
    channel: "RoomChannel",
    roomId: roomId
  }, {
    connected: function() {},
    disconnected: function() {},
    received: function(data) {
      return $('#messages').append(data['message']);
    },
    speak: function(message, roomId) {
      return this.perform('speak', {
        message: message,
        roomId: roomId
      });
    }
  });

  $(document).on('keypress', '[data-behavior~=room_speaker]', function(event) {
    if (event.keyCode === 13) {
      App.room.speak(event.target.value, roomId);
      event.target.value = "";
      event.preventDefault();
    }
    return $('#messages').animate({
      scrollTop: $('#messages')[0].scrollHeight
    }, 100);
  });
};

在 channels/room_channel.rb 中，它可以作为订阅创建的参数使用，并且也刚刚使用正确的数据调用了说话动作:

In channels/room_channel.rb it becomes available as a parameter for the subscription creation, and the speak action was also just called with the correct data:

  def subscribed
    stream_from "room_channel_#{params[:roomId]}"
  end

  def speak(data)
     Message.create! text: data['message'], room_id: data['roomId']
  end

然后，如果您从工作中广播:

And then if you're broadcasting from a job:

  def perform(message)
    ActionCable.server.broadcast "room_channel_#{message.room_id}", message: render_message(message)
  end

这篇关于ActionCable:如何使用动态频道的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！