Carrierwave上传文件 - nil的未定义方法`delete'：NilClass

时间：2013-12-09 14:06:11

标签： ruby-on-rails carrierwave

我正在尝试使用carrierwave gem上传表单中的文件，但是我收到以下错误：

DashboardController中的NoMethodError #create：nil的未定义方法`delete'：NilClass

我做错了什么？

请求参数：

{"utf8"=>"✓",
 "authenticity_token"=>"bv+3HGSl2/sDUi/aXqDw+b3XWgBM+cvXUrAQTZxWHeA=",
 "song"=>{"user_id"=>"",
 "title"=>"2",
 "artist"=>"3",
 "album"=>"4",
 "musicfile"=>#<ActionDispatch::Http::UploadedFile:0x00000001bb5bb0 @tempfile=#<Tempfile:/tmp/RackMultipart20131209-11818-jf368b>,
 @original_filename="dg.mp3",
 @content_type="audio/mp3",
 @headers="Content-Disposition: form-data; name=\"song[musicfile]\"; filename=\"dg.mp3\"\r\nContent-Type: audio/mp3\r\n">},
 "commit"=>"Upload"}

控制器方法：

  def new
        @song = Song.new
  end
  def create
        @song=Song.new(params[:song])
        @song.save
        uploader = MusicfileUploader.new
        uploader.store!(params[:song][:musicfile])

        #redirect_to dashboard_index_path
  end

或者如果你需要一切：

https://github.com/cristi92b/GS2

编辑：

终端服务器输出：

Started GET "/dashboard/new" for 127.0.0.1 at 2013-12-09 17:54:15 +0200
Processing by DashboardController#new as HTML
  Rendered dashboard/_form.html.erb (112.5ms)
  Rendered dashboard/new.html.erb within layouts/application (122.0ms)
Completed 200 OK in 131ms (Views: 128.2ms | ActiveRecord: 0.5ms)

Started POST "/dashboard" for 127.0.0.1 at 2013-12-09 17:54:44 +0200
Processing by DashboardController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"IfQNLZ8OuXjkowgj35C4BbC6nbusB+anhvNiL2SlEQY=", "song"=>{"user_id"=>"", "title"=>"1", "artist"=>"2", "album"=>"3", "musicfile"=>#<ActionDispatch::Http::UploadedFile:0x00000003086080 @tempfile=#<Tempfile:/tmp/RackMultipart20131209-2805-1jvt87a>, @original_filename="dg.mp3", @content_type="audio/mp3", @headers="Content-Disposition: form-data; name=\"song[musicfile]\"; filename=\"dg.mp3\"\r\nContent-Type: audio/mp3\r\n">}, "commit"=>"Upload"}
Completed 500 Internal Server Error in 1ms

NoMethodError (undefined method `delete' for nil:NilClass):
  app/controllers/dashboard_controller.rb:12:in `create'


  Rendered /home/cristi/.gem/ruby/2.0.0/gems/actionpack-4.0.2/lib/action_dispatch/middleware/templates/rescues/_source.erb (0.8ms)
  Rendered /home/cristi/.gem/ruby/2.0.0/gems/actionpack-4.0.2/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.4ms)
  Rendered /home/cristi/.gem/ruby/2.0.0/gems/actionpack-4.0.2/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.3ms)
  Rendered /home/cristi/.gem/ruby/2.0.0/gems/actionpack-4.0.2/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (15.2ms)

网页“完整追踪”：

activerecord (4.0.2) lib/active_record/attribute_methods/write.rb:35:in `write_attribute'
activerecord (4.0.2) lib/active_record/attribute_methods/dirty.rb:70:in `write_attribute'
activerecord (4.0.2) lib/active_record/attribute_methods/write.rb:21:in `__temp__57375627f59646='
activemodel (4.0.2) lib/active_model/model.rb:80:in `public_send'
activemodel (4.0.2) lib/active_model/model.rb:80:in `block in initialize'
activemodel (4.0.2) lib/active_model/model.rb:79:in `each'
activemodel (4.0.2) lib/active_model/model.rb:79:in `initialize'
activerecord (4.0.2) lib/active_record/inheritance.rb:27:in `new'
activerecord (4.0.2) lib/active_record/inheritance.rb:27:in `new'
app/controllers/dashboard_controller.rb:12:in `create'
actionpack (4.0.2) lib/action_controller/metal/implicit_render.rb:4: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__1534113615882314291__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'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `catch'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:35: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__992470349095990657__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/lib64/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
/usr/lib64/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
/usr/lib64/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'

1 个答案:

答案 0 :(得分：2)

您获得的错误是由于ActiveRecord中@attributes_cache为nil。如果你谷歌“@attributes_cache nil”你会发现一些关于这个但没有答案的问题。我意识到这不是一个很好的答案，可能不会真正帮助你，但我认为这些信息属于某个地方而不是评论希望有人可以在此基础上继续发展。

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