ruby-on-rails - Rails Action 电缆特定消费者

Question

我正在努力解决 Action 线 .就我而言，我有几个用户(通过 Devise )可以彼此共享任务。

现在当user#1与 user#2 共享任务(通过表单)所有经过身份验证的用户都会收到通知。

我应该如何以及在哪里识别我的user#2只向他广播？

到目前为止，这是我的代码:

连接.rb

module ApplicationCable
  class Connection < ActionCable::Connection::Base
    identified_by :current_user

    def connect
      self.current_user = find_verified_user
      logger.add_tags 'ActionCable', current_user.id
    end

    protected

    def find_verified_user # this checks whether a user is authenticated with devise
      if verified_user = env['warden'].user
        verified_user
      else
        reject_unauthorized_connection
      end
    end
  end
end

电缆.js

(function() {
  this.App || (this.App = {});

  App.cable = ActionCable.createConsumer();

}).call(this);

todo_channel.rb

class TodoChannel < ApplicationCable::Channel
  def subscribed
    stream_from "todo_channel_#{current_user.id}"
  end

  def unsubscribed
    # Any cleanup needed when channel is unsubscribed
  end


  def notify
    ActionCable.server.broadcast "todo_channel_#{current_user.id}", message: 'some message'(not implemented yet)
  end
end

todo.coffee

App.todo = App.cable.subscriptions.create "TodoChannel",
  connected: ->
    # Called when the subscription is ready for use on the server

  disconnected: ->
    # Called when the subscription has been terminated by the server

  received: (data) ->
    console.log(data['message'])

  notify: ->
    @perform 'notify'

Answer 1

我之前也遇到过类似的情况，直到我意识到您实际上可以调用 stream_from在 channel 中多次，该用户将在同一 channel 连接中订阅多个不同的“房间”。这意味着你基本上可以做到这一点

class TodoChannel < ApplicationCable::Channel
  def subscribed
    stream_from "todo_channel_all"                            
    stream_from "todo_channel_#{current_user.id}"
  end

  def unsubscribed
    # Any cleanup needed when channel is unsubscribed
  end

  def notify(data)
    # depending on data given from the user, send it to only one specific user or everyone listening to the "todo_channel_all"
    if data['message']['other_user_id']
      ActionCable.server.broadcast "todo_channel_#{data['message']['other_user_id']}", message: 'some message'
    else
      ActionCable.server.broadcast "todo_channel_all", message: 'some message'
    end

  end
end

该代码假设用户已经知道其他用户的 id 并将其发送到 channel ，您可能必须用一些安全性或其他东西来包装它，我承认我对 rails 的经验不是很好，因为我还在学习。

将来可能对您有益的另一件事是，您还可以在同一 channel 功能中广播多个消息/时间。这意味着您可以潜在地支持将您的任务发送给单个特定用户、特定用户列表或每个人。只需在列表/数组/任何用户上进行迭代，然后在他们的个人“todo_channel_#{user.id}”上向他们广播任务/消息/通知/任何内容