ActionCable:如何使用动态渠道

Question

我与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.

如何使频道订阅和消息广播动态化,以便创建聊天频道并将消息发送到正确的频道？

遗憾的是,我找不到一个代码示例.

更新

以下答案是正确的.我也发现它现在在导轨指南中提到过.在http://edgeguides.rubyonrails.org/action_cable_overview.html#client-server-interactions-subscriptions之前不要认为它在那里

Answer 1

在您的订阅创建中传递roomId 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它中可用作订阅创建的参数,并且只是使用正确的数据调用了发言操作:

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

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

然后,如果你从一份工作广播:

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