使用Action Cable从模型rails调用类方法获取未定义的局部变量或方法

NameError (undefined local variable or method `connections_info' for MicropostNotificationsChannel:Class):

app/channels/micropost_notifications_channel.rb:12:in `notify'
app/models/notification.rb:8:in `block in <class:Notification>'
app/controllers/likes_controller.rb:11:in `create'
Rendering C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.text.erb
...

据我所知,通过使用控制器和模型,我可以调用class方法 after_commit -> {MicropostNotificationsChannel.notify(self)} self.notifiy(notification) 然后作为 connections_info

class Notification < ApplicationRecord
  ...
  after_commit -> {MicropostNotificationsChannel.notify(self)}
end

最新通知频道

class MicropostNotificationsChannel < ApplicationCable::Channel

  def subscribe
    ...
  end

  def unsubscribe
    ...
  end

  def self.notifiy(notification)
    connection_results = connections_info
    puts connection_results.inspect
  end
end

频道.rb

module ApplicationCable
  class Channel < ActionCable::Channel::Base

    def connections_info
      # do stuff here
    end
  end
end