如何在ActionCable rails-5-api应用中获取current_user?

问题描述

为什么我无法在频道内检索current_user或应该如何检索current_user?

Why am I not able to retrieve current_user inside my channel or how should I retrieve current_user?

我用什么?

• Rails 5.0.1 --api (我没有任何意见，也不使用咖啡)
• 我使用react-native应用程序测试此 (无需授权即可正常运行)
• 我不使用devise进行身份验证 (我使用JWT而不是使用Knock ，因此没有cookie)

如 ruby​​doc所述，尝试在ActionCable频道内获取current_user .info

Trying to get current_user inside my ActionCable channel as described in rubydoc.info

代码看起来像

class MessageChannel < ApplicationCable::Channel
  identified_by :current_user

  def subscribed
    stream_from 'message_' + find_current_user_privileges
  end

  def unsubscribed
    # Any cleanup needed when channel is unsubscribed
  end

  protected

  def find_current_user_privileges
    if current_user.has_role? :admin
      'admin'
    else
      'user_' + current_user.id
    end
  end

end

运行它，我得到这个错误:

And running it, I get this error:

[NoMethodError - undefined method `identified_by' for MessageChannel:Class]

如果我删除identified_by :current_user，我会得到

[NameError - undefined local variable or method `current_user' for #<MessageChannel:0x7ace398>]

推荐答案

如果看到提供的文档，您将知道identified_by不是Channel实例的方法.这是Actioncable::Connection的方法.从Rails的《 Actioncable概述》指南中，这是Connection类的样子:

If you see the doc you provided, you will know that identified_by is not a method for a Channel instance. It is a method for Actioncable::Connection.From Rails guide for Actioncable Overview, this is how a Connection class looks like:

#app/channels/application_cable/connection.rb
module ApplicationCable
  class Connection < ActionCable::Connection::Base
    identified_by :current_user

    def connect
      self.current_user = find_verified_user
    end

    private
      def find_verified_user
        if current_user = User.find_by(id: cookies.signed[:user_id])
          current_user
        else
          reject_unauthorized_connection
        end
      end
  end
end

如您所见，current_user在此处不可用.相反，您必须在连接中在此处创建current_user.

As you can see, current_user is not available here. Instead, you have to create a current_user here in connection.

websocket服务器没有会话，但是可以读取与主应用程序相同的cookie.所以我想，您需要在身份验证后保存cookie.

The websocket server doesn't have a session, but it can read the same cookies as the main app. So I guess, you need to save cookie after authentication.

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