Рельсы ERB ошибка

-1

Я делаю приложение блога CRUD, и написал этот код:Рельсы ERB ошибка

<h1>New Article</h1> 
<%= form_for :article , url:articles_path do|f| %> 
    <% if @article.errors.any? %> 
    <div id="error_explanation"> 
     <h2> 
     <%= pluralize%> 
     </h2> 
    </div> 
    <% end %> 
    <p> 
     <%= f.label :title %><br/> 
     <%= f.text_field :title %> 
    </p> 
    <p> 
     <%= f.label :text %><br/> 
     <%= f.text_area :text %> 
    </p> 
    <p> 
     <%= f.submit%> 
    </p> 
<% end %> 
<%= link_to 'Back', articles_path %>

Моя страница показывает undefined method `errors' for nil:NilClass. Что я должен здесь исправить?

Контроллер:

class ArticlesController < ApplicationController 
    # new form method 
    def new 

    end 

    # create method 
    def create 
    @article = Article.new(params.require(:article).permit(:title,:text))  
    if @article.save 
     redirect_to @article 
    else 
     render 'new' 
    end  
    end 

    #Show method 
    def show 
    @article = Article.find(params[:id]) 
    end 

    # New method 
    def new 

    end 

    #index method 
    def index 
    @articles = Article.all 
    end 
end

И полная трассировку здесь:

app/views/articles/new.html.erb:5:in `block in _app_views_articles_new_html_erb___837982527363082027_69849494310700' 
actionview (4.2.0) lib/action_view/helpers/capture_helper.rb:38:in `block in capture' 
actionview (4.2.0) lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer' 
actionview (4.2.0) lib/action_view/helpers/capture_helper.rb:38:in `capture' 
actionview (4.2.0) lib/action_view/helpers/form_helper.rb:444:in `form_for' 
app/views/articles/new.html.erb:3:in `_app_views_articles_new_html_erb___837982527363082027_69849494310700' 
actionview (4.2.0) lib/action_view/template.rb:145:in `block in render' 
activesupport (4.2.0) lib/active_support/notifications.rb:166:in `instrument' 
actionview (4.2.0) lib/action_view/template.rb:333:in `instrument' 
actionview (4.2.0) lib/action_view/template.rb:143:in `render' 
actionview (4.2.0) lib/action_view/renderer/template_renderer.rb:54:in `block (2 levels) in render_template' 
actionview (4.2.0) lib/action_view/renderer/abstract_renderer.rb:39:in `block in instrument' 
activesupport (4.2.0) lib/active_support/notifications.rb:164:in `block in instrument' 
activesupport (4.2.0) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (4.2.0) lib/active_support/notifications.rb:164:in `instrument' 
actionview (4.2.0) lib/action_view/renderer/abstract_renderer.rb:39:in `instrument' 
actionview (4.2.0) lib/action_view/renderer/template_renderer.rb:53:in `block in render_template' 
actionview (4.2.0) lib/action_view/renderer/template_renderer.rb:61:in `render_with_layout' 
actionview (4.2.0) lib/action_view/renderer/template_renderer.rb:52:in `render_template' 
actionview (4.2.0) lib/action_view/renderer/template_renderer.rb:14:in `render' 
actionview (4.2.0) lib/action_view/renderer/renderer.rb:42:in `render_template' 
actionview (4.2.0) lib/action_view/renderer/renderer.rb:23:in `render' 
actionview (4.2.0) lib/action_view/rendering.rb:100:in `_render_template' 
actionpack (4.2.0) lib/action_controller/metal/streaming.rb:217:in `_render_template' 
actionview (4.2.0) lib/action_view/rendering.rb:83:in `render_to_body' 
actionpack (4.2.0) lib/action_controller/metal/rendering.rb:32:in `render_to_body' 
actionpack (4.2.0) lib/action_controller/metal/renderers.rb:37:in `render_to_body' 
actionpack (4.2.0) lib/abstract_controller/rendering.rb:25:in `render' 
actionpack (4.2.0) lib/action_controller/metal/rendering.rb:16:in `render' 
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render' 
activesupport (4.2.0) lib/active_support/core_ext/benchmark.rb:12:in `block in ms' 
/home/prio/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/benchmark.rb:303:in `realtime' 
activesupport (4.2.0) lib/active_support/core_ext/benchmark.rb:12:in `ms' 
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:41:in `block in render' 
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime' 
activerecord (4.2.0) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime' 
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:40:in `render' 
actionpack (4.2.0) lib/action_controller/metal/implicit_render.rb:10:in `default_render' 
actionpack (4.2.0) lib/action_controller/metal/implicit_render.rb:5:in `send_action' 
actionpack (4.2.0) lib/abstract_controller/base.rb:198:in `process_action' 
actionpack (4.2.0) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (4.2.0) lib/abstract_controller/callbacks.rb:20:in `block in process_action' 
activesupport (4.2.0) lib/active_support/callbacks.rb:117:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:117:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:234:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:234:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:234:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:92:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:92:in `_run_callbacks' 
activesupport (4.2.0) lib/active_support/callbacks.rb:734:in `_run_process_action_callbacks' 
activesupport (4.2.0) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (4.2.0) lib/abstract_controller/callbacks.rb:19:in `process_action' 
actionpack (4.2.0) lib/action_controller/metal/rescue.rb:29:in `process_action' 
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action' 
activesupport (4.2.0) lib/active_support/notifications.rb:164:in `block in instrument' 
activesupport (4.2.0) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (4.2.0) lib/active_support/notifications.rb:164:in `instrument' 
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
actionpack (4.2.0) lib/action_controller/metal/params_wrapper.rb:250:in `process_action' 
activerecord (4.2.0) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (4.2.0) lib/abstract_controller/base.rb:137:in `process' 
actionview (4.2.0) lib/action_view/rendering.rb:30:in `process' 
actionpack (4.2.0) lib/action_controller/metal.rb:195:in `dispatch' 
actionpack (4.2.0) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch' 
actionpack (4.2.0) lib/action_controller/metal.rb:236:in `block in action' 
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:73:in `call' 
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:42:in `serve' 
actionpack (4.2.0) lib/action_dispatch/journey/router.rb:43:in `block in serve' 
actionpack (4.2.0) lib/action_dispatch/journey/router.rb:30:in `each' 
actionpack (4.2.0) lib/action_dispatch/journey/router.rb:30:in `serve' 
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:802:in `call' 
rack (1.6.0) lib/rack/etag.rb:24:in `call' 
rack (1.6.0) lib/rack/conditionalget.rb:25:in `call' 
rack (1.6.0) lib/rack/head.rb:13:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/params_parser.rb:27:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/flash.rb:260:in `call' 
rack (1.6.0) lib/rack/session/abstract/id.rb:225:in `context' 
rack (1.6.0) lib/rack/session/abstract/id.rb:220:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/cookies.rb:560:in `call' 
activerecord (4.2.0) lib/active_record/query_cache.rb:36:in `call' 
activerecord (4.2.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:647:in `call' 
activerecord (4.2.0) lib/active_record/migration.rb:378:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:88:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:88:in `_run_callbacks' 
activesupport (4.2.0) lib/active_support/callbacks.rb:734:in `_run_call_callbacks' 
activesupport (4.2.0) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (4.2.0) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/reloader.rb:73:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/remote_ip.rb:78:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' 
web-console (2.1.1) lib/web_console/middleware.rb:37:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' 
railties (4.2.0) lib/rails/rack/logger.rb:38:in `call_app' 
railties (4.2.0) lib/rails/rack/logger.rb:20:in `block in call' 
activesupport (4.2.0) lib/active_support/tagged_logging.rb:68:in `block in tagged' 
activesupport (4.2.0) lib/active_support/tagged_logging.rb:26:in `tagged' 
activesupport (4.2.0) lib/active_support/tagged_logging.rb:68:in `tagged' 
railties (4.2.0) lib/rails/rack/logger.rb:20:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/request_id.rb:21:in `call' 
rack (1.6.0) lib/rack/methodoverride.rb:22:in `call' 
rack (1.6.0) lib/rack/runtime.rb:18:in `call' 
activesupport (4.2.0) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' 
rack (1.6.0) lib/rack/lock.rb:17:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/static.rb:113:in `call' 
rack (1.6.0) lib/rack/sendfile.rb:113:in `call' 
railties (4.2.0) lib/rails/engine.rb:518:in `call' 
railties (4.2.0) lib/rails/application.rb:164:in `call' 
rack (1.6.0) lib/rack/lock.rb:17:in `call' 
rack (1.6.0) lib/rack/content_length.rb:15:in `call' 
rack (1.6.0) lib/rack/handler/webrick.rb:89:in `service' 
/home/prio/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service' 
/home/prio/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run' 
/home/prio/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'

источник

2015-03-12 Mahabub Islam Prio

Требуется полная ошибка. –

Вы должны передать '@ article' из своего метода контроллера, предположим, что это страница' new.html.erb', тогда в контроллере у вас будет 'новый' метод в этом' @article = Article.new'. Отправьте свой код контроллера – Sontya

в 'новый' метод просто добавьте' @article = Article.new' – Sontya

Вам необходимо определить метод «новый». Это может сработать: def new @article = Article.new end И у вас есть два «новых» метода. Удалите его.

источник

2015-03-12 17:02:59

При вызове new переменная @article не определена. Вам не нужен этот код в вашей форме. Вы должны поместить этот код в свое шоу или когда-либо просматривать его после создания новой статьи.

Редактировать: Я вижу, что вы перенаправляете обратно на new, если сбой невозможен. В этот момент это будет определено. Я хотел бы изменить код, чтобы проверить, если @article определяется первым:

<% if @article.errors %>

это будет обрабатывать ситуацию @article быть неопределенным, так как он не был вызван.

источник

2015-03-12 16:59:27 Beartech

Рельсы ERB ошибка

ответ

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