位于 HomeController 中的 index 的视图中，有一段代码：

= form_for resource, controller => "devise", :as => resource_name, :url => session_path(resource_name), :class => "login ui fluid form" do |f|
              .ui.inverted.dimmer
                .ui.small.loader
              .field
                label for="email" E-mail
                = f.email_field :email, :required => false, :autofocus => true, :tabindex => "1"
              .field
                a href="/forgot_password" class="forgot" target="_blank"
                  = t('user.forgot_password')
                label for="password"
                  = t('user.password')
                = f.password_field :password, :required => false, :tabindex => "2"

              = f.submit t('user.login'), :class =>"fluid ui small submit button", :tabindex => "3"

运行提示找不到 resource 这的 method……但赶脚已经指定了 controller 了啊……为何还是不行……这段代码在 DeviseController 中可以正常使用