命名空间控制器导致 Rails-3 中出现错误

Question

我正在使用 ActsAsTaggableOn 向我的应用程序添加标记。除了我从这个 gem 获得的功能之外，我还想添加一个 TagsController 并基本上将标签视为我的应用程序中的任何其他资源。

我创建了tags_controller.rb，其中包含

class ActsAsTaggableOn::TagsController < ApplicationController
    # ...
end

并在我的routes.rb中添加了

resources :tags, :module => :acts_as_taggable_on

当我运行rake paths时，我得到

    tags GET    /tags(.:format)             {:action=>"index", :controller=>"acts_as_taggable_on/tags"}
         POST   /tags(.:format)             {:action=>"create", :controller=>"acts_as_taggable_on/tags"}
 new_tag GET    /tags/new(.:format)         {:action=>"new", :controller=>"acts_as_taggable_on/tags"}
edit_tag GET    /tags/:id/edit(.:format)    {:action=>"edit", :controller=>"acts_as_taggable_on/tags"}
     tag GET    /tags/:id(.:format)         {:action=>"show", :controller=>"acts_as_taggable_on/tags"}
         PUT    /tags/:id(.:format)         {:action=>"update", :controller=>"acts_as_taggable_on/tags"}
         DELETE /tags/:id(.:format)         {:action=>"destroy", :controller=>"acts_as_taggable_on/tags"}

......这对我来说都是合理的。

但是，当我点击 localhost:3000/tags 时，我收到此错误：

LoadError (Expected MyApp/tags_controller.rb to define TagsController)

如果我尝试在控制台中评估 ActsAsTaggableOn::TagsController ，我会收到基本相同的错误：

LoadError: Expected MyApp/app/controllers/tags_controller.rb to define TagsController
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.4/lib/active_support/dependencies.rb:492:in `load_missing_constant'
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.4/lib/active_support/dependencies.rb:183:in `block in const_missing'
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.4/lib/active_support/dependencies.rb:181:in `each'
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.4/lib/active_support/dependencies.rb:181:in `const_missing'
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.4/lib/active_support/dependencies.rb:503:in `load_missing_constant'
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.4/lib/active_support/dependencies.rb:183:in `block in const_missing'
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.4/lib/active_support/dependencies.rb:181:in `each'
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.4/lib/active_support/dependencies.rb:181:in `const_missing'
    from (irb):1
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.4/lib/rails/commands/console.rb:44:in `start'
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.4/lib/rails/commands/console.rb:8:in `start'
    from ~/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.4/lib/rails/commands.rb:23:in `'
    from script/rails:6:in `require'
    from script/rails:6:in `'

我做错了什么？

Answer 1

Rails 期望模块和类位于其命名空间的目录中。因此，您应该将控制器、视图和助手移动到 acts_as_taggable_on 目录中：

• app/controllers/acts_as_taggable_on/tags_controller.rb
• app/views/acts_as_taggable_on/tags/index .html.erb
• 等。

我不确定你为什么需要这个命名空间。如果您只想在现有模型上创建 REST 操作，则可以生成 scaffold_controller。例如：

rails generate scaffold_controller Tag name:string

Answer 2

Michael 关于命名空间控制器的目录结构是正确的。

话虽这么说，控制器不必与模型位于同一名称空间中。相反，您可以让名为 SomeController 的控制器与名为 SomeModel 的模型一起使用。您是否已尝试从控制器类中删除名称空间并看看出了什么问题？