Rails 500服务器错误:"index"的未定义方法'formats':string

我的新rails应用程序中出现500服务器错误.

奇怪的是,如果你重新启动rails服务器(我使用默认的webrick),重新加载后的第一个请求就完全正常了.但是,每个后续请求都会返回此500错误.

当它开始弹出时我没有做任何特别有趣的事情 - 只是在帮助器和模型之间移动一些代码.知道我应该从哪里开始寻求解决这个问题吗？

这是错误的文本:

    Started GET "/" for 127.0.0.1 at 2013-12-27 01:18:24 -0500
Processing by MealsController#index as HTML
Completed 500 Internal Server Error in 1ms

NoMethodError (undefined method `formats' for "index":String):
  actionpack (4.0.2) lib/action_view/renderer/template_renderer.rb:11:in `render'
  actionpack (4.0.2) lib/action_view/renderer/renderer.rb:42:in `render_template'
  actionpack (4.0.2) lib/action_view/renderer/renderer.rb:23:in `render'
  actionpack (4.0.2) lib/abstract_controller/rendering.rb:127:in `_render_template'
  actionpack (4.0.2) lib/action_controller/metal/streaming.rb:219:in `_render_template'
  actionpack (4.0.2) lib/abstract_controller/rendering.rb:120:in `render_to_body'
  actionpack (4.0.2) lib/action_controller/metal/rendering.rb:33:in `render_to_body'
  actionpack (4.0.2) lib/action_controller/metal/renderers.rb:26:in `render_to_body'
  actionpack (4.0.2) lib/abstract_controller/rendering.rb:97:in `render'
  actionpack (4.0.2) lib/action_controller/metal/rendering.rb:16:in `render'
  actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render'
  activesupport (4.0.2) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
  /usr/lib/ruby/1.9.1/benchmark.rb:295:in `realtime'
  activesupport (4.0.2) lib/active_support/core_ext/benchmark.rb:12:in `ms'
  actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:41:in `block in render'
  actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime'
  activerecord (4.0.2) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
  actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:40:in `render'
  actionpack (4.0.2) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
  actionpack (4.0.2) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
  actionpack (4.0.2) lib/abstract_controller/base.rb:189:in `process_action'
  actionpack (4.0.2) lib/action_controller/metal/rendering.rb:10:in `process_action'
  actionpack (4.0.2) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
  activesupport (4.0.2) lib/active_support/callbacks.rb:403:in `_run__958396735213239085__process_action__callbacks'
  activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks'
  actionpack (4.0.2) lib/abstract_controller/callbacks.rb:17:in `process_action'
  actionpack (4.0.2) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
  activesupport (4.0.2) lib/active_support/notifications.rb:159:in `block in instrument'
  activesupport (4.0.2) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.0.2) lib/active_support/notifications.rb:159:in `instrument'
  actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
  actionpack (4.0.2) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
  activerecord (4.0.2) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (4.0.2) lib/abstract_controller/base.rb:136:in `process'
  actionpack (4.0.2) lib/abstract_controller/rendering.rb:44:in `process'
  actionpack (4.0.2) lib/action_controller/metal.rb:195:in `dispatch'
  actionpack (4.0.2) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
  actionpack (4.0.2) lib/action_controller/metal.rb:231:in `block in action'
  actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:80:in `call'
  actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
  actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:48:in `call'
  actionpack (4.0.2) lib/action_dispatch/journey/router.rb:71:in `block in call'
  actionpack (4.0.2) lib/action_dispatch/journey/router.rb:59:in `each'
  actionpack (4.0.2) lib/action_dispatch/journey/router.rb:59:in `call'
  actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:680:in `call'
  rack (1.5.2) lib/rack/etag.rb:23:in `call'
  rack (1.5.2) lib/rack/conditionalget.rb:25:in `call'
  rack (1.5.2) lib/rack/head.rb:11:in `call'
  actionpack (4.0.2) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  actionpack (4.0.2) lib/action_dispatch/middleware/flash.rb:241:in `call'
  rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
  rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
  actionpack (4.0.2) lib/action_dispatch/middleware/cookies.rb:486:in `call'
  activerecord (4.0.2) lib/active_record/query_cache.rb:36:in `call'
  activerecord (4.0.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call'
  activerecord (4.0.2) lib/active_record/migration.rb:369:in `call'
  actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.0.2) lib/active_support/callbacks.rb:373:in `_run__1155797797933786738__call__callbacks'
  activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks'
  actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.0.2) lib/action_dispatch/middleware/reloader.rb:64:in `call'
  actionpack (4.0.2) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
  actionpack (4.0.2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  actionpack (4.0.2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.0.2) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.0.2) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in `block in tagged'
  activesupport (4.0.2) lib/active_support/tagged_logging.rb:25:in `tagged'
  activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in `tagged'
  railties (4.0.2) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.0.2) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
  rack (1.5.2) lib/rack/runtime.rb:17:in `call'
  activesupport (4.0.2) lib/active_support/cache/strategy/local_cache.rb:83:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  actionpack (4.0.2) lib/action_dispatch/middleware/static.rb:64:in `call'
  rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
  railties (4.0.2) lib/rails/engine.rb:511:in `call'
  railties (4.0.2) lib/rails/application.rb:97:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  rack (1.5.2) lib/rack/content_length.rb:14:in `call'
  rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
  /usr/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
  /usr/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
  /usr/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

Ninigi.. 14

好吧,这个帖子有点老了,但我遇到了同样的问题,我能够解决它.这里的关键是:"当它开始弹出时我没有做任何特别有趣的事情 - 只是在帮助器和模型之间移动一些代码."

我打赌你在你的模型中使用了"include something"...确保它看起来像这样:

class ClassName
  include WhatEver::Base

并不是:

include WhatEver::Base
class ClassName

Rails会以某种方式为您加载并需要文件.在dev/test环境中,它将继续重新加载文件,但是在生产中,类可能最终被加载到内存中,而不重新加载文件,因此包含的模块将在首次加载时存在但不在之后.