NoMethodError пользователей # показать

Я после рельсы учебник @http://railstutorial.org NoMethodError пользователей # показать

В главе 11, У меня возникли проблемы с показом microposts от пользователей.

Основываясь на учебном пособии, тест RSPEC должен пройти. Тем не менее, он не

1) UsersController GET 'show' should show the user's microposts 
Failure/Error: get :show, :id => @user 
undefined method `model_name' for NilClass:Class 
# ./app/views/users/show.html.erb:10:in `_app_views_users_show_html_erb__49 
# ./spec/controllers/users_controller_spec.rb:71

При попытке доступа к странице пользователя, который имеет microposts, связанные с ним, я получаю исключение:

NoMethodError in Users#show 

Showing C:/Documents and Settings/XXXXX/workspace/sample_app/app/views/users/show.html.erb where line #10 raised: 

undefined method `model_name' for NilClass:Class 
Extracted source (around line #10): 

7:  </h1> 
8:  <% unless @user.microposts.empty? %> 
9:   <table class="microposts" summary="User microposts"> 
10:   <%= render @microposts %> 
11:   </table> 
12:   <%= will_paginate @microposts %> 
13:  <% end %> 
Rails.root: C:/Documents and Settings/XXXXX/workspace/sample_app 

Application Trace | Framework Trace | Full Trace 
actionpack (3.0.0) lib/action_view/render/partials.rb:319:in `partial_path' 
actionpack (3.0.0) lib/action_view/render/partials.rb:207:in `setup' 
actionpack (3.0.0) lib/action_view/render/partials.rb:186:in `initialize' 
actionpack (3.0.0) lib/action_view/render/partials.rb:331:in `new' 
actionpack (3.0.0) lib/action_view/render/partials.rb:331:in `_render_partial' 
actionpack (3.0.0) lib/action_view/render/rendering.rb:31:in `render' 
app/views/users/show.html.erb:10:in `_app_views_users_show_html_erb__49899798_36559632_0' 
actionpack (3.0.0) lib/action_view/template.rb:135:in `send' 
actionpack (3.0.0) lib/action_view/template.rb:135:in `render' 
activesupport (3.0.0) lib/active_support/notifications.rb:54:in `instrument' 
actionpack (3.0.0) lib/action_view/template.rb:127:in `render' 
actionpack (3.0.0) lib/action_view/render/rendering.rb:59:in `_render_template' 
activesupport (3.0.0) lib/active_support/notifications.rb:52:in `instrument' 
activesupport (3.0.0) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
activesupport (3.0.0) lib/active_support/notifications.rb:52:in `instrument' 
actionpack (3.0.0) lib/action_view/render/rendering.rb:56:in `_render_template' 
actionpack (3.0.0) lib/action_view/render/rendering.rb:26:in `render' 
actionpack (3.0.0) lib/abstract_controller/rendering.rb:114:in `_render_template' 
actionpack (3.0.0) lib/abstract_controller/rendering.rb:108:in `render_to_body' 
actionpack (3.0.0) lib/action_controller/metal/renderers.rb:47:in `render_to_body' 
actionpack (3.0.0) lib/action_controller/metal/compatibility.rb:55:in `render_to_body' 
actionpack (3.0.0) lib/abstract_controller/rendering.rb:101:in `render_to_string' 
actionpack (3.0.0) lib/abstract_controller/rendering.rb:92:in `render' 
actionpack (3.0.0) lib/action_controller/metal/rendering.rb:17:in `render' 
actionpack (3.0.0) lib/action_controller/metal/instrumentation.rb:40:in `render' 
activesupport (3.0.0) lib/active_support/core_ext/benchmark.rb:5:in `ms' 
c:/Ruby187/lib/ruby/1.8/benchmark.rb:308:in `realtime' 
activesupport (3.0.0) lib/active_support/core_ext/benchmark.rb:5:in `ms' 
actionpack (3.0.0) lib/action_controller/metal/instrumentation.rb:40:in `render' 
actionpack (3.0.0) lib/action_controller/metal/instrumentation.rb:78:in `cleanup_view_runtime' 
activerecord (3.0.0) lib/active_record/railties/controller_runtime.rb:15:in `cleanup_view_runtime' 
actionpack (3.0.0) lib/action_controller/metal/instrumentation.rb:39:in `render' 
actionpack (3.0.0) lib/action_controller/metal/implicit_render.rb:10:in `default_render' 
actionpack (3.0.0) lib/action_controller/metal/implicit_render.rb:5:in `send_action' 
actionpack (3.0.0) lib/abstract_controller/base.rb:150:in `process_action' 
actionpack (3.0.0) lib/action_controller/metal/rendering.rb:11:in `process_action' 
actionpack (3.0.0) lib/abstract_controller/callbacks.rb:18:in `process_action' 
activesupport (3.0.0) lib/active_support/callbacks.rb:435:in `_run__434435962__process_action__453433196__callbacks' 
activesupport (3.0.0) lib/active_support/callbacks.rb:409:in `send' 
activesupport (3.0.0) lib/active_support/callbacks.rb:409:in `_run_process_action_callbacks' 
activesupport (3.0.0) lib/active_support/callbacks.rb:93:in `send' 
activesupport (3.0.0) lib/active_support/callbacks.rb:93:in `run_callbacks' 
actionpack (3.0.0) lib/abstract_controller/callbacks.rb:17:in `process_action' 
actionpack (3.0.0) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
activesupport (3.0.0) lib/active_support/notifications.rb:52:in `instrument' 
activesupport (3.0.0) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
activesupport (3.0.0) lib/active_support/notifications.rb:52:in `instrument' 
actionpack (3.0.0) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
actionpack (3.0.0) lib/action_controller/metal/rescue.rb:17:in `process_action' 
actionpack (3.0.0) lib/abstract_controller/base.rb:119:in `process' 
actionpack (3.0.0) lib/abstract_controller/rendering.rb:40:in `process' 
actionpack (3.0.0) lib/action_controller/metal.rb:133:in `dispatch' 
actionpack (3.0.0) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
actionpack (3.0.0) lib/action_controller/metal.rb:173 
actionpack (3.0.0) lib/action_dispatch/routing/route_set.rb:62:in `call' 
actionpack (3.0.0) lib/action_dispatch/routing/route_set.rb:62:in `dispatch' 
actionpack (3.0.0) lib/action_dispatch/routing/route_set.rb:27:in `call' 
rack-mount (0.6.13) lib/rack/mount/route_set.rb:148:in `call' 
rack-mount (0.6.13) lib/rack/mount/code_generation.rb:93:in `recognize' 
rack-mount (0.6.13) lib/rack/mount/code_generation.rb:82:in `optimized_each' 
rack-mount (0.6.13) lib/rack/mount/code_generation.rb:92:in `recognize' 
rack-mount (0.6.13) lib/rack/mount/route_set.rb:139:in `call' 
actionpack (3.0.0) lib/action_dispatch/routing/route_set.rb:492:in `call' 
actionpack (3.0.0) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
actionpack (3.0.0) lib/action_dispatch/middleware/head.rb:14:in `call' 
rack (1.2.1) lib/rack/methodoverride.rb:24:in `call' 
actionpack (3.0.0) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
actionpack (3.0.0) lib/action_dispatch/middleware/flash.rb:182:in `call' 
actionpack (3.0.0) lib/action_dispatch/middleware/session/abstract_store.rb:149:in `call' 
actionpack (3.0.0) lib/action_dispatch/middleware/cookies.rb:287:in `call' 
activerecord (3.0.0) lib/active_record/query_cache.rb:32:in `call' 
activerecord (3.0.0) lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache' 
activerecord (3.0.0) lib/active_record/query_cache.rb:12:in `cache' 
activerecord (3.0.0) lib/active_record/query_cache.rb:31:in `call' 
activerecord (3.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:355:in `call' 
actionpack (3.0.0) lib/action_dispatch/middleware/callbacks.rb:46:in `call' 
activesupport (3.0.0) lib/active_support/callbacks.rb:415:in `_run_call_callbacks' 
actionpack (3.0.0) lib/action_dispatch/middleware/callbacks.rb:44:in `call' 
rack (1.2.1) lib/rack/sendfile.rb:107:in `call' 
actionpack (3.0.0) lib/action_dispatch/middleware/remote_ip.rb:48:in `call' 
actionpack (3.0.0) lib/action_dispatch/middleware/show_exceptions.rb:46:in `call' 
railties (3.0.0) lib/rails/rack/logger.rb:13:in `call' 
rack (1.2.1) lib/rack/runtime.rb:17:in `call' 
activesupport (3.0.0) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.2.1) lib/rack/lock.rb:11:in `call' 
rack (1.2.1) lib/rack/lock.rb:11:in `synchronize' 
rack (1.2.1) lib/rack/lock.rb:11:in `call' 
actionpack (3.0.0) lib/action_dispatch/middleware/static.rb:30:in `call' 
railties (3.0.0) lib/rails/application.rb:168:in `call' 
railties (3.0.0) lib/rails/application.rb:77:in `send' 
railties (3.0.0) lib/rails/application.rb:77:in `method_missing' 
railties (3.0.0) lib/rails/rack/log_tailer.rb:14:in `call' 
rack (1.2.1) lib/rack/content_length.rb:13:in `call' 
rack (1.2.1) lib/rack/handler/webrick.rb:52:in `service' 
c:/Ruby187/lib/ruby/1.8/webrick/httpserver.rb:104:in `service' 
c:/Ruby187/lib/ruby/1.8/webrick/httpserver.rb:65:in `run' 
c:/Ruby187/lib/ruby/1.8/webrick/server.rb:173:in `start_thread' 
c:/Ruby187/lib/ruby/1.8/webrick/server.rb:162:in `start' 
c:/Ruby187/lib/ruby/1.8/webrick/server.rb:162:in `start_thread' 
c:/Ruby187/lib/ruby/1.8/webrick/server.rb:95:in `start' 
c:/Ruby187/lib/ruby/1.8/webrick/server.rb:92:in `each' 
c:/Ruby187/lib/ruby/1.8/webrick/server.rb:92:in `start' 
c:/Ruby187/lib/ruby/1.8/webrick/server.rb:23:in `start' 
c:/Ruby187/lib/ruby/1.8/webrick/server.rb:82:in `start' 
rack (1.2.1) lib/rack/handler/webrick.rb:13:in `run' 
rack (1.2.1) lib/rack/server.rb:213:in `start' 
railties (3.0.0) lib/rails/commands/server.rb:65:in `start' 
railties (3.0.0) lib/rails/commands.rb:30 
railties (3.0.0) lib/rails/commands.rb:27:in `tap' 
railties (3.0.0) lib/rails/commands.rb:27 
script/rails:6:in `require' 
script/rails:6 
Request 

Parameters: 

{"id"=>"1"} 
Show session dump 

Show env dump 

Response 

Headers: 

None

Я пытался найти кого-то с подобными проблемами, но безрезультатно.

Я переписал весь код этой главы из учебника, чтобы убедиться, что это не опечатка, до сих пор не помогло.

Спасибо за предоставленную помощь.

источник

2010-10-14 Dave

У меня была такая же проблема ... потребовалось время, чтобы разобраться. У меня было два экземпляра метода show, определенного в UserController. Как только я удалил тот, который не содержал объявление @microposts (у 2-го не было @microposts), тесты выполнялись так, как ожидалось, и страница отображала микросообщения правильно.

Cheers! a

источник

2010-10-15 02:56:27 alphanumericone

Это была именно эта проблема. Теперь я вижу, откуда он. В предыдущих главах, когда я определил метод show, пример учебника поместил метод в конец кода, тогда как в главе 11 он помещает его в начало. Так что, несмотря на мою многочисленную вырезку/пасту, я просто заменил метод дублирования, а не оригинал. Большое спасибо! – Dave

Спасибо за ваш ответ alphanumericone. У меня была такая же проблема. Это абсолютно сводило меня с ума. Такая небольшая ошибка может означать такой dras – icantbecool

Это была моя проблема! Большое спасибо! – JeffH

NoMethodError пользователей # показать

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