我想用RubyonRails进行身份验证,每个用户都有自己的帐户。但是现在我得到了这个错误:undefinedmethoduser_signed_in?for#有人能帮帮我吗?代码如下:完整跟踪:app/controllers/projects_controller.rb:69:in`require_login'activesupport(3.2.3)lib/active_support/callbacks.rb:418:in`_run__2505248868868045404__process_action__114470166732456289__callbacks'actives