Sidekiq不显示其他类的日志

Question

为什么来自User类的日志消息没有显示在Sidekiq日志窗口中？

expenses_worker.rb

class ExpensesWorker
    include Sidekiq::Worker

    def perform
      logger.info "I am called from worker" #<-- it is visible in Sidekiq!
      User.do_stuff
    end
end

user.rb

class User < ActiveRecord::Base
  self.do_stuff
    logger.info "I am doing stuff"  #<-- it is NOT visible in Sidekiq...
  end
end