How to stop subscribing to the action channel from the server?

Question

Is there a way to stop subscribing to a specific channel for any specific consumer from the server (controller) side so that I can disable the callback in my coffee script?

Answer 1

You can do something like this.

class YourChannel < ApplicationCable::Channel

  #your code

  def your_custom_action
    if something
      reject_subscription
    end
  end
end

Answer 2

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

Before calling rejectyou can also inform the subscriber about the reason for rejection:

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 3

. , . , , . Rails, .

, remote_connections :

subscription_identifier = "{\"channel\":\"ChatChannel\", \"chat_id\":1}"
remote_connection = ActionCable.server.remote_connections.where(current_user: User.find(1))
remote_connection.unsubscribe(subscription_identifier)

internal_channel ( ), , .