在Application Controller中,如果cookies.signed [:user_id],我有一个方法current_user和if语句。该方法一直有效,但今天我创建了新的控制器和路由,它给我一个错误
undefined method `signed' for nil:NilClass
这是应用程序控制器:
class ApplicationController < ActionController::Base
protect_from_forgery with: :null_session
before_action :current_user
protected
def current_user
if cookies.signed[:user_id] && User.find(cookies.signed[:user_id])
@current_user = User.find(cookies.signed[:user_id])
end
end
end
这是服务器日志:
Processing by HomeController#index as HTML
Completed 500 Internal Server Error in 23ms (ActiveRecord: 0.0ms)
NoMethodError (undefined method `signed' for nil:NilClass):
app/controllers/application_controller.rb:18:in `current_user'
Rendering /Users/Dudis/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout
Rendering /Users/Dudis/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_source.html.erb
Rendered /Users/Dudis/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (4.5ms)
Rendering /Users/Dudis/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
Rendered /Users/Dudis/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (2.0ms)
Rendering /Users/Dudis/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
Rendered /Users/Dudis/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.3ms)
Rendered /Users/Dudis/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (187.4ms)
任何建议为什么它不再起作用?我没有在应用程序中进行任何更新。
从错误中可以看出,方法cookies
返回nil。即使你没有任何cookie,AFAIK,rails的实现也不应该这样做。这让我觉得它不是正在运行的rails版本。如果我猜测,你在该控制器中有一个方法cookies
(在评论中确认)。
cookies
是零undefined method signed for nil:NilClass (nil.signed)