如何终止从服务器订阅动作电缆频道？ [英] How to terminate subscription to an actioncable channel from server?

问题描述

是否可以从服务器端（控制器）终止任何特定使用者对特定频道的预订，以便可以调用我的咖啡脚本文件中断开连接的回调？

Is there a way to terminate the subscription to a particular channel for any particular consumer from the server side (controller) so that disconnected callback in my coffee script file can be invoked?

推荐答案

http://api.rubyonrails.org/classes/ActionCable/Channel/Base.html#class-ActionCable::Channel::Base-label-Rejecting+subscription+请求

class ChatChannel < ApplicationCable::Channel
  def subscribed
    @room = Chat::Room[params[:room_number]]
    reject unless current_user.can_access?(@room)
  end
end

在调用拒绝之前，您还可以通知订户拒绝的原因：

Before calling reject you can also inform the subscriber of the reject's reason:

class ChatChannel < ApplicationCable::Channel
  def subscribed

    if params["answerer"]

      answerer = params["answerer"]

      answerer_user = User.find_by email: answerer

      if answerer_user

        stream_from "chat_#{answerer_user}_channel"    

      else

        connection.transmit identifier: params, error: "The user #{answerer} not found."

  # http://api.rubyonrails.org/classes/ActionCable/Channel/Base.html#class-ActionCable::Channel::Base-label-Rejecting+subscription+requests

        reject

      end

    else

        connection.transmit identifier: params, error: "No params specified."

  # http://api.rubyonrails.org/classes/ActionCable/Channel/Base.html#class-ActionCable::Channel::Base-label-Rejecting+subscription+requests

        reject

    end     

  end
end

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