ActionView::Template::Error: #<Rails::App> 的未定义方法 `config'答案

【问题标题】：ActionView::Template::Error: undefined method `config' for #<Rails::App>ActionView::Template::Error: #<Rails::App> 的未定义方法 `config'
【发布时间】：2013-12-19 08:22:49
【问题描述】：

我编写了一个完整的 Rails 引擎，并尝试（使用 RSpec）测试我的控制器。

仅在调用 render 方法时发生错误。在return 或redirect 方法上一切正常。只有测试有问题。我使用虚拟应用程序。

堆栈：

  # Failure/Error: get(:search, params)
  ActionView::Template::Error:
      undefined method `config' for #<Rails::App:0x000000034d9ee8>
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.15/lib/rails.rb:78:in `root'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/template.rb:175:in `inspect'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/template.rb:334:in `identifier_method_name'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/template.rb:330:in `method_name'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/template.rb:267:in `compile'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/template.rb:244:in `block in compile!'
  # <internal:prelude>:10:in `synchronize'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/template.rb:232:in `compile!'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/template.rb:144:in `block in render'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/notifications.rb:123:in `block in instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/notifications.rb:123:in `instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/template.rb:143:in `render'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/renderer/template_renderer.rb:47:in `block (2 levels) in render_template'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/notifications.rb:123:in `block in instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/notifications.rb:123:in `instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/renderer/template_renderer.rb:46:in `block in render_template'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/renderer/template_renderer.rb:54:in `render_with_layout'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/renderer/template_renderer.rb:45:in `render_template'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/renderer/template_renderer.rb:18:in `render'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/renderer/renderer.rb:36:in `render_template'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_view/renderer/renderer.rb:17:in `render'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/abstract_controller/rendering.rb:110:in `_render_template'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/streaming.rb:225:in `_render_template'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/abstract_controller/rendering.rb:103:in `render_to_body'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/renderers.rb:28:in `render_to_body'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/abstract_controller/rendering.rb:88:in `render'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/rendering.rb:16:in `render'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
  # /home/shooma/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/benchmark.rb:295:in `realtime'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/core_ext/benchmark.rb:5:in `ms'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/instrumentation.rb:40:in `block in render'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.15/lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/instrumentation.rb:39:in `render'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/implicit_render.rb:10:in `default_render'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/implicit_render.rb:5:in `send_action'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/abstract_controller/base.rb:167:in `process_action'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/rendering.rb:10:in `process_action'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/abstract_controller/callbacks.rb:18:in `block in process_action'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/callbacks.rb:403:in `_run__3295526729938120009__process_action__2756155078140629527__callbacks'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/callbacks.rb:405:in `__run_callback'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/callbacks.rb:81:in `run_callbacks'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/abstract_controller/callbacks.rb:17:in `process_action'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/rescue.rb:29:in `process_action'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/notifications.rb:123:in `block in instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.15/lib/active_support/notifications.rb:123:in `instrument'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/instrumentation.rb:29:in `process_action'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.15/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/abstract_controller/base.rb:121:in `process'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/abstract_controller/rendering.rb:45:in `process'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/metal/testing.rb:17:in `process_with_new_base_test'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/test_case.rb:490:in `process'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/test_case.rb:54:in `process'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.15/lib/action_controller/test_case.rb:407:in `get'
  # ./spec/controllers/pretty_search_controller_spec.rb:37:in `block (5 levels) in <top (required)>'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example.rb:114:in `instance_eval'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example.rb:114:in `block in run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/extensions/instance_eval_with_args.rb:16:in `instance_exec'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/extensions/instance_eval_with_args.rb:16:in `instance_eval_with_args'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example.rb:247:in `instance_eval_with_args'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/hooks.rb:106:in `block (2 levels) in run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/hooks.rb:104:in `call'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/hooks.rb:104:in `run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/hooks.rb:446:in `run_hook'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:340:in `run_around_each_hooks'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example.rb:256:in `with_around_each_hooks'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example.rb:111:in `run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:390:in `block in run_examples'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:386:in `map'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:386:in `run_examples'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:371:in `run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:372:in `block in run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:372:in `map'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:372:in `run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:372:in `block in run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:372:in `map'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:372:in `run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:372:in `block in run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:372:in `map'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/example_group.rb:372:in `run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/command_line.rb:28:in `block (2 levels) in run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/command_line.rb:28:in `map'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/command_line.rb:28:in `block in run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/reporter.rb:58:in `report'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/command_line.rb:25:in `run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/runner.rb:80:in `run'
  # /home/shooma/.rvm/gems/ruby-1.9.3-p194/gems/rspec-core-2.14.6/lib/rspec/core/runner.rb:17:in `block in autorun'

我应该往哪个方向挖？

engine on GitHub

更新：在控制器调用 render 时 - 我出错了。

但如果在控制器中调用 render :text => 'foo' - 测试通过。

虚拟应用程序配置中的某个地方出现问题。但我找不到它。

UPD2：

下降规格：

  context 'action should return @options and @results' do
    it '@options should be an instance variable, which eq hash of three keys' do
      get(:search, params)
      # do something
    end
  end

控制器：

def search
  # do something
  render
end

解决方案：

这是我的错。问题是在测试环境中重载了一些内部 Rails 类。很抱歉花了时间，@sameera207，感谢您的参与。

【问题讨论】：

标签： ruby-on-rails ruby rspec rails-engines

【解决方案1】：

render 和 redirect 之间的区别在于，redirect 会加载您的重定向操作，但 render 不会，

例如：

  def new
    @user = User.new 
  end

  def create
    if <some conditions>
       redirect_to 'new' 
    else
       render 'new'
    end
  end

所以当你调用render 时，它不会创建User.new，只会重定向。因此，您可能正在渲染一个从config 加载某些内容的操作。

所以解决方案是

def new
        @user = User.new 
      end

      def create
        if <some conditions>
           redirect_to 'new' 
        else
           @user = User.new
           render 'new'
        end
      end

我希望你明白这一点。如果您可以发布spec，有人可能会更轻松地提供帮助..

【讨论】：

感谢您的回答！但我认为Dummy:App的配置中的问题（问题已更新）。
我编辑问题，如果剪得太短，here 是完整规格，here 是完整原始控制器
对我来说它有效，我有一个 git clone，运行 bundle install 和 from the plugin directory you should run spec（不在虚拟目录内）。以下是结果，gist.github.com/sameera207/8038652