ruby-on-rails - ActionController::RoutingError(nil:NilClass 的未定义方法 ‘sub’)

Question

当我尝试查看 localhost:3000/galleries

时，我在浏览器中收到此错误

---

路由错误

undefined method `sub' for nil:NilClass

---

我的日志文件告诉我

ActionController::RoutingError (undefined method ‘sub’ for nil:NilClass)`
  app/controllers/galleries_controller.rb:1:in `<top (required)>'
  Rendered /Users/mikev/.rvm/gems/ruby-1.9.3-head/gems/actionpack-3.1.3/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (0.8ms)

routes.rb

Gallery::Application.routes.draw do
  match 'galleries' => 'galleries#index'  
end

Controller /galleries_controller.rb:

class GalleriesController < ApplicationController
  def index

  end
end

views/galleries/index.html.erb 为空

知道这意味着什么吗？

Answer 1

此问题通常发生在路由器尝试查找常量名但失败时。

你有 app/helpers/galleries_helper.rb 中的助手吗？如果是，它是否定义了 GalleriesHelper？