給一個404而不是一個500錯誤的缺失模板

我有一個Rails 3.0應用程序（工作在3.2升級），當有人請求一個不存在的模板時，它會在生產中產生一個500錯誤。例如，mysite.com/blog_posts/532將標識爲532的帖子發回爲HTML，但沒有問題，但如果因爲某種原因請求了mysite.com/blog_posts/532.txt，該應用會引發500個ActionView :: MissingTemplate錯誤。給一個404而不是一個500錯誤的缺失模板

這不應該發生，因爲該模板不應該在那裏擺在首位。它應該更適當地是一個404錯誤，或者可能只是顯示HTML模板。

如何讓應用程序爲所有缺失模板錯誤顯示404錯誤，或顯示默認HTML模板而不是給出500？

登錄：

Started GET "/blog_posts/73.txt" for 127.0.0.1 at 2013-05-20 21:22:51 -0400 
    Processing by BlogPostsController#show as TEXT 
    Parameters: {"id"=>"73"} 
    PK and serial sequence (2.0ms) SELECT attr.attname, seq.relname 
FROM pg_class seq, 
pg_attribute attr, 
pg_depend dep, 
pg_namespace name, 
pg_constraint cons 
WHERE seq.oid = dep.objid 
AND seq.relkind = 'S' 
AND attr.attrelid = dep.refobjid 
AND attr.attnum = dep.refobjsubid 
AND attr.attrelid = cons.conrelid 
AND attr.attnum = cons.conkey[1] 
AND cons.contype = 'p' 
AND dep.refobjid = '"blog_posts_blog_tags"'::regclass 
    PK and custom sequence (1.0ms) SELECT attr.attname, 
CASE 
WHEN split_part(def.adsrc, '''', 2) ~ '.' THEN 
substr(split_part(def.adsrc, '''', 2), 
strpos(split_part(def.adsrc, '''', 2), '.')+1) 
ELSE split_part(def.adsrc, '''', 2) 
END 
FROM pg_class t 
JOIN pg_attribute attr ON (t.oid = attrelid) 
JOIN pg_attrdef def ON (adrelid = attrelid AND adnum = attnum) 
JOIN pg_constraint cons ON (conrelid = adrelid AND adnum = conkey[1]) 
WHERE t.oid = '"blog_posts_blog_tags"'::regclass 
AND cons.contype = 'p' 
AND def.adsrc ~* 'nextval' 
    BlogPost Load (0.0ms) SELECT "blog_posts".* FROM "blog_posts" WHERE "blog_posts"."id" = '73' LIMIT 1 
    SQL (0.0ms) SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull 
FROM pg_attribute a LEFT JOIN pg_attrdef d 
ON a.attrelid = d.adrelid AND a.attnum = d.adnum 
WHERE a.attrelid = '"blog_posts"'::regclass 
AND a.attnum > 0 AND NOT a.attisdropped 
ORDER BY a.attnum 
Completed 500 Internal Server Error in 59ms 
    User Load (1.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1 
    SQL (1.0ms) SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull 
FROM pg_attribute a LEFT JOIN pg_attrdef d 
ON a.attrelid = d.adrelid AND a.attnum = d.adnum 
WHERE a.attrelid = '"users"'::regclass 
AND a.attnum > 0 AND NOT a.attisdropped 
ORDER BY a.attnum 

ActionView::MissingTemplate (Missing template blog_posts/show with {:handlers=>[:erb, :rjs, :builder, :rhtml, :rxml], :formats=>[:text], :lo 
cale=>[:en, :en]} in view paths "C:/Rails/myapp/app/views", "C:/Ruby/lib/ruby/gems/1.9.1/gems/devise-1.5.4/app/views"): 


Rendered C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/templates/rescues/missing_template.erb within res 
cues/layout (1.0ms)

更新日誌，以跟蹤：

Started GET "/blog_posts/73.txt" for 127.0.0.1 at 2013-05-20 22:14:28 -0400 
    Processing by BlogPostsController#show as TEXT 
    Parameters: {"id"=>"73"} 
    PK and serial sequence (2.0ms) SELECT attr.attname, seq.relname 
FROM pg_class seq, 
pg_attribute attr, 
pg_depend dep, 
pg_namespace name, 
pg_constraint cons 
WHERE seq.oid = dep.objid 
AND seq.relkind = 'S' 
AND attr.attrelid = dep.refobjid 
AND attr.attnum = dep.refobjsubid 
AND attr.attrelid = cons.conrelid 
AND attr.attnum = cons.conkey[1] 
AND cons.contype = 'p' 
AND dep.refobjid = '"blog_posts_blog_tags"'::regclass 
    PK and custom sequence (1.0ms) SELECT attr.attname, 
CASE 
WHEN split_part(def.adsrc, '''', 2) ~ '.' THEN 
substr(split_part(def.adsrc, '''', 2), 
strpos(split_part(def.adsrc, '''', 2), '.')+1) 
ELSE split_part(def.adsrc, '''', 2) 
END 
FROM pg_class t 
JOIN pg_attribute attr ON (t.oid = attrelid) 
JOIN pg_attrdef def ON (adrelid = attrelid AND adnum = attnum) 
JOIN pg_constraint cons ON (conrelid = adrelid AND adnum = conkey[1]) 
WHERE t.oid = '"blog_posts_blog_tags"'::regclass 
AND cons.contype = 'p' 
AND def.adsrc ~* 'nextval' 
    BlogPost Load (0.0ms) SELECT "blog_posts".* FROM "blog_posts" WHERE "blog_posts"."id" = '73' LIMIT 1 
    SQL (0.0ms) SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull 
FROM pg_attribute a LEFT JOIN pg_attrdef d 
ON a.attrelid = d.adrelid AND a.attnum = d.adnum 
WHERE a.attrelid = '"blog_posts"'::regclass 
AND a.attnum > 0 AND NOT a.attisdropped 
ORDER BY a.attnum 
-------------------------------------------------------------------------------- 
exception: Missing template blog_posts/show with {:handlers=>[:erb, :rjs, :builder, :rhtml, :rxml], :formats=>[:text], :locale=>[:en, :en]} in view paths "C:/Rails/myapp/app/views", "C:/Ruby/lib/ruby/gems/1.9.1/gems/devise-1.5.4/app/views" 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_view/paths.rb:15:in `find' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_view/lookup_context.rb:81:in `find' 
C:in `find_template' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_view/render/rendering.rb:46:in `_determine_template' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_view/render/rendering.rb:24:in `render' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/abstract_controller/rendering.rb:115:in `_render_template' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/abstract_controller/rendering.rb:109:in `render_to_body' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/renderers.rb:47:in `render_to_body' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/compatibility.rb:55:in `render_to_body' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/abstract_controller/rendering.rb:102:in `render_to_string' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/abstract_controller/rendering.rb:93:in `render' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/rendering.rb:17:in `render' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.20/lib/active_support/core_ext/benchmark.rb:5:in `block in ms' 
C:/Ruby/lib/ruby/1.9.1/benchmark.rb:295:in `realtime' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.20/lib/active_support/core_ext/benchmark.rb:5:in `ms' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/instrumentation.rb:40:in `block in render' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/instrumentation.rb:78:in `cleanup_view_runtime' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.20/lib/active_record/railties/controller_runtime.rb:15:in `cleanup_view_runtime' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/instrumentation.rb:39:in `render' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/implicit_render.rb:10:in `default_render' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/implicit_render.rb:5:in `send_action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/abstract_controller/base.rb:150:in `process_action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/rendering.rb:11:in `process_action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.20/lib/active_support/callbacks.rb:436:in `_run__326851374__process_action__856302785__callbacks' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.20/lib/active_support/callbacks.rb:410:in `_run_process_action_callbacks' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.20/lib/active_support/callbacks.rb:94:in `run_callbacks' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/abstract_controller/callbacks.rb:17:in `process_action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/rescue.rb:17:in `process_action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.20/lib/active_support/notifications.rb:52:in `block in instrument' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.20/lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.20/lib/active_support/notifications.rb:52:in `instrument' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/instrumentation/rails3/action_controller.rb:38:in `block in process_action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/instrumentation/controller_instrumentation.rb:318:in `perform_action_with_newrelic_trace' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/agent/instrumentation/rails3/action_controller.rb:37:in `process_action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/abstract_controller/base.rb:119:in `process' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/abstract_controller/rendering.rb:41:in `process' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal.rb:138:in `dispatch' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_controller/metal.rb:178:in `block in action' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/routing/route_set.rb:68:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/routing/route_set.rb:68:in `dispatch' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/routing/route_set.rb:33:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-mount-0.6.14/lib/rack/mount/route_set.rb:148:in `block in call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-mount-0.6.14/lib/rack/mount/code_generation.rb:93:in `block in recognize' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-mount-0.6.14/lib/rack/mount/code_generation.rb:89:in `optimized_each' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-mount-0.6.14/lib/rack/mount/code_generation.rb:92:in `recognize' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-mount-0.6.14/lib/rack/mount/route_set.rb:139:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/routing/route_set.rb:499:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/rack/error_collector.rb:12:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/rack/agent_hooks.rb:18:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/newrelic_rpm-3.6.2.96/lib/new_relic/rack/developer_mode.rb:28:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/warden-1.2.1/lib/warden/manager.rb:35:in `block in call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/warden-1.2.1/lib/warden/manager.rb:34:in `catch' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/warden-1.2.1/lib/warden/manager.rb:34:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/head.rb:14:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-1.2.7/lib/rack/methodoverride.rb:24:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/flash.rb:182:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/session/abstract_store.rb:149:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/cookies.rb:302:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.20/lib/active_record/query_cache.rb:32:in `block in call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.20/lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.20/lib/active_record/query_cache.rb:12:in `cache' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.20/lib/active_record/query_cache.rb:31:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.20/lib/active_record/connection_adapters/abstract/connection_pool.rb:354:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/callbacks.rb:46:in `block in call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.20/lib/active_support/callbacks.rb:416:in `_run_call_callbacks' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/callbacks.rb:44:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-1.2.7/lib/rack/sendfile.rb:106:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/remote_ip.rb:48:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/show_exceptions.rb:47:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.20/lib/rails/rack/logger.rb:13:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-1.2.7/lib/rack/runtime.rb:17:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/activesupport-3.0.20/lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-1.2.7/lib/rack/lock.rb:13:in `block in call' 
<internal:prelude>:10:in `synchronize' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-1.2.7/lib/rack/lock.rb:13:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/actionpack-3.0.20/lib/action_dispatch/middleware/static.rb:30:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/airbrake-3.1.4/lib/airbrake/rack.rb:41:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/airbrake-3.1.4/lib/airbrake/user_informer.rb:12:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.20/lib/rails/application.rb:168:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.20/lib/rails/application.rb:77:in `method_missing' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/railties-3.0.20/lib/rails/rack/log_tailer.rb:14:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-1.2.7/lib/rack/content_length.rb:13:in `call' 
C:/Ruby/lib/ruby/gems/1.9.1/gems/rack-1.2.7/lib/rack/handler/webrick.rb:52:in `service' 
C:/Ruby/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' 
C:/Ruby/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' 
C:/Ruby/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' 
-------------------------------------------------------------------------------- 
Completed 200 OK in 59ms 
[2013-05-20 22:14:28] WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked 
= true

來源

2013-05-21 John

嗨，約翰，你可以請你的請求發佈日誌？我剛剛嘗試了一個我的應用程序，我得到一個406不可接受，因爲.txt不是一個可以接受的請求。如果你得到一個500，應該有一個原因。 – Idavod

我剛剛更新了日誌的問題。我想知道我們各自的應用有什麼不同？我喜歡Doon的答案，但我非常有興趣瞭解不同的行爲。 – John

您需要隔離問題。我建議你用'begin/rescue'塊包圍'show'方法。在救援區塊：rescue exception => exc logger.error「exception：＃{exc.message}」 logger.error exc.backtrace.join（「\ n」） end '然後重新發布日誌。發生了一些奇怪的事情：應用程序執行一個'Blog.find'，然後產生一個500錯誤，然後查找用戶，我想你已經有了一個開始/救援/確保塊... – Idavod

在你的ApplicationController可以應該能夠從丟失的模板搶救，然後再提高404。

class ApplicationController > ActionController::Base 
    rescue_from ActionView::MissingTemplate do |exception| 
    raise ActionController::RoutingError.new('Not Found') 
    end 
end

來源

2013-05-21 01:20:03 Doon

不是最好的解決方案。您可能想要在生產環境中獲取/追蹤這些異常情況，以防出現問題。如果我們只發送不想回復的MIME類型的404，那會更好。（根據定義，406更「正確」，但您可能希望隱藏您的實現細節）。不過，您的答案是解決問題的快速解決方案。 – Filippos

從技術上講，您可以在處理程序中添加條件並在此處執行跟蹤。這是OP想要的。（我從來沒有這樣的需求，我不知道我會在這裏的生產應用程序。 – Doon

給一個404而不是一個500錯誤的缺失模板

回答

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