如何终止从服务器订购actioncable频道？

Question

有没有办法从服务器端(控制器)终止对任何特定使用者的特定通道的订阅,以便可以调用我的咖啡脚本文件中的断开连接回调？

Answer 1

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

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

在致电之前，reject您还可以将拒绝的原因告知订阅者：

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

Answer 2

你可以做这样的事情。

class YourChannel < ApplicationCable::Channel

  #your code

  def your_custom_action
    if something
      reject_subscription
    end
  end
end