当我将我的应用程序推送到Heroku时，为什么我收到错误500“我们很抱歉，但出了点问题”？
我把我的应用程序推到了Heroku，我得到了“我们很抱歉，但出了点问题（500）”为什么会这样？ 我知道错误消息来自我在/ public目录中的一个标题为500.html的文件，但我不确定为什么会这样。
我的heroku日志和我的mongoid.yml文件一样。 谢谢。
Heroku日志：
2014-02-23T02:12:14.311710+00:00 heroku[router]: at=info method=GET path=/ host=danacamilleapp.herokuapp.com request_id=25556ae0-c4ac-40f7-8008-bd8860b87039 fwd="72.89.235.136" dyno=web.1 connect=27ms service=18ms status=500 bytes=932 2014-02-23T02:12:14.311277+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/mongoid/sessions.rb:171:in `collection' 2014-02-23T02:12:14.311277+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/mongoid/sessions.rb:137:in `with_name' 2014-02-23T02:12:14.311520+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/mongoid/contextual.rb:34:in `context' 2014-02-23T02:12:14.311277+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/mongoid/sessions/factory.rb:28:in `create' 2014-02-23T02:12:14.311277+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/mongoid/sessions/factory.rb:122:in `inject_ports' 2014-02-23T02:12:14.311520+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/mongoid/contextual/mongo.rb:260:in `initialize' 2014-02-23T02:12:14.311520+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/callbacks.rb:405:in `__run_callback' 2014-02-23T02:12:14.311520+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/mongoid/contextual.rb:19:in `first' 2014-02-23T02:12:14.311698+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_controller/metal/rescue.rb:29:in `process_action' 2014-02-23T02:12:14.311520+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/mongoid/finders.rb:117:in `first' 2014-02-23T02:12:14.311520+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/locomotive_cms-2.4.1/lib/locomotive/routing/site_dispatcher.rb:23:in `fetch_site' 2014-02-23T02:12:14.311520+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/callbacks.rb:429:in `_run__204668899024992162__process_action__4317869837325352294__callbacks' 2014-02-23T02:12:14.311698+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/abstract_controller/callbacks.rb:17:in `process_action' 2014-02-23T02:12:14.311520+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/mongoid/contextual.rb:21:in `rescue in first' 2014-02-23T02:12:14.311698+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/notifications.rb:123:in `block in instrument' 2014-02-23T02:12:14.311698+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 2014-02-23T02:12:14.311698+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 2014-02-23T02:12:14.311698+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 2014-02-23T02:12:14.312217+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/abstract_controller/rendering.rb:45:in `process' 2014-02-23T02:12:14.311698+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/callbacks.rb:81:in `run_callbacks' 2014-02-23T02:12:14.311698+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_controller/metal/params_wrapper.rb:207:in `process_action' 2014-02-23T02:12:14.311698+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_controller/metal/instrumentation.rb:29:in `process_action' 2014-02-23T02:12:14.311698+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/notifications.rb:123:in `instrument' 2014-02-23T02:12:14.312217+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 2014-02-23T02:12:14.312217+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:68:in `block in call' 2014-02-23T02:12:14.312217+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:56:in `each' 2014-02-23T02:12:14.312217+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_controller/metal.rb:203:in `dispatch' 2014-02-23T02:12:14.312217+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_controller/metal.rb:246:in `block in action' 2014-02-23T02:12:14.312217+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/abstract_controller/base.rb:121:in `process' 2014-02-23T02:12:14.312217+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 2014-02-23T02:12:14.312217+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/routing/route_set.rb:73:in `call' 2014-02-23T02:12:14.312393+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/routing/route_set.rb:608:in `call' 2014-02-23T02:12:14.312393+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/warden-1.2.3/lib/warden/manager.rb:35:in `block in call' 2014-02-23T02:12:14.312393+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:56:in `call' 2014-02-23T02:12:14.312217+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/routing/route_set.rb:36:in `call' 2014-02-23T02:12:14.312393+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/warden-1.2.3/lib/warden/manager.rb:34:in `call' 2014-02-23T02:12:14.312393+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/rack/mongoid/middleware/identity_map.rb:34:in `block in call' 2014-02-23T02:12:14.312393+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/locomotive_cms-2.4.1/lib/locomotive/middlewares/seo_trailing_slash.rb:16:in `call' 2014-02-23T02:12:14.312393+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/mongoid/unit_of_work.rb:39:in `unit_of_work' 2014-02-23T02:12:14.312393+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/warden-1.2.3/lib/warden/manager.rb:34:in `catch' 2014-02-23T02:12:14.312746+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/cookies.rb:341:in `call' 2014-02-23T02:12:14.312746+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 2014-02-23T02:12:14.312393+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/mongoid-3.1.6/lib/rack/mongoid/middleware/identity_map.rb:34:in `call' 2014-02-23T02:12:14.312393+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/locomotive_cms-2.4.1/lib/locomotive/middlewares/inline_editor.rb:10:in `call' 2014-02-23T02:12:14.312746+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/flash.rb:242:in `call' 2014-02-23T02:12:14.312746+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/session/abstract/id.rb:210:in `context' 2014-02-23T02:12:14.312746+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/dragonfly-0.9.15/lib/dragonfly/cookie_monster.rb:9:in `call' 2014-02-23T02:12:14.312746+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/conditionalget.rb:25:in `call' 2014-02-23T02:12:14.312746+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/params_parser.rb:21:in `call' 2014-02-23T02:12:14.312746+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/etag.rb:23:in `call' 2014-02-23T02:12:14.312746+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/head.rb:14:in `call' 2014-02-23T02:12:14.313298+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.16/lib/rails/rack/logger.rb:16:in `block in call' 2014-02-23T02:12:14.312923+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 2014-02-23T02:12:14.312923+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 2014-02-23T02:12:14.312746+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/session/abstract/id.rb:205:in `call' 2014-02-23T02:12:14.312923+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/callbacks.rb:81:in `run_callbacks' 2014-02-23T02:12:14.313298+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/tagged_logging.rb:22:in `tagged' 2014-02-23T02:12:14.312923+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/callbacks.rb:405:in `__run_callback' 2014-02-23T02:12:14.312923+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 2014-02-23T02:12:14.312923+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/callbacks.rb:405:in `_run__3023919651669179927__call__2916391713023742690__callbacks' 2014-02-23T02:12:14.312923+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 2014-02-23T02:12:14.312923+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/callbacks.rb:27:in `call' 2014-02-23T02:12:14.313298+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/methodoverride.rb:21:in `call' 2014-02-23T02:12:14.313298+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.16/lib/rails/rack/logger.rb:16:in `call' 2014-02-23T02:12:14.313298+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/request_id.rb:22:in `call' 2014-02-23T02:12:14.313298+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.16/lib/active_support/cache/strategy/local_cache.rb:72:in `call' 2014-02-23T02:12:14.312923+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.16/lib/rails/rack/logger.rb:32:in `call_app' 2014-02-23T02:12:14.312923+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 2014-02-23T02:12:14.313480+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/dragonfly-0.9.15/lib/dragonfly/middleware.rb:13:in `call' 2014-02-23T02:12:14.313480+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.16/lib/rails/engine.rb:484:in `call' 2014-02-23T02:12:14.313860+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/lib/thin/connection.rb:55:in `process' 2014-02-23T02:12:14.314052+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/lib/thin/runner.rb:200:in `run_command' 2014-02-23T02:12:14.314052+00:00 app[web.1]: 2014-02-23T02:12:14.313298+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.16/lib/action_dispatch/middleware/static.rb:63:in `call' 2014-02-23T02:12:14.313298+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward' 2014-02-23T02:12:14.313480+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/locomotive_cms-2.4.1/lib/locomotive/middlewares/permalink.rb:17:in `call' 2014-02-23T02:12:14.313860+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/lib/thin/connection.rb:80:in `pre_process' 2014-02-23T02:12:14.313860+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/eventmachine-1.0.3/lib/eventmachine.rb:187:in `run_machine' 2014-02-23T02:12:14.313480+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!' 2014-02-23T02:12:14.313860+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/lib/thin/connection.rb:82:in `block in pre_process' 2014-02-23T02:12:14.313480+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call' 2014-02-23T02:12:14.313298+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/lock.rb:15:in `call' 2014-02-23T02:12:14.313480+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/locomotive_cms-2.4.1/lib/locomotive/middlewares/cache.rb:20:in `call' 2014-02-23T02:12:14.313860+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/lib/thin/server.rb:162:in `start' 2014-02-23T02:12:14.313480+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch' 2014-02-23T02:12:14.313480+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:185:in `lookup' 2014-02-23T02:12:14.313860+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/lib/thin/connection.rb:41:in `receive_data' 2014-02-23T02:12:14.313860+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/eventmachine-1.0.3/lib/eventmachine.rb:187:in `run' 2014-02-23T02:12:14.313298+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/runtime.rb:17:in `call' 2014-02-23T02:12:14.313480+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.16/lib/rails/application.rb:231:in `call' 2014-02-23T02:12:14.313480+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.16/lib/rails/railtie/configurable.rb:30:in `method_missing' 2014-02-23T02:12:14.313860+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/lib/thin/backends/base.rb:73:in `start' 2014-02-23T02:12:14.314052+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/lib/thin/runner.rb:156:in `run!' 2014-02-23T02:12:14.314052+00:00 app[web.1]: 2014-02-23T02:12:14.313860+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/lib/thin/controllers/controller.rb:87:in `start' 2014-02-23T02:12:14.313860+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/lib/thin/connection.rb:80:in `catch' 2014-02-23T02:12:14.314052+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/bin/thin:23:in `' 2014-02-23T02:12:14.314052+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/bin/thin:23:in `load' 2014-02-23T02:12:14.314052+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/thin-1.6.1/bin/thin:6:in `' 2014-02-23T02:12:13.056223+00:00 heroku[router]: at=info method=GET path=/ host=danacamilleapp.herokuapp.com request_id=2d206784-0fff-4f81-b58c-96e73fd13722 fwd="72.89.235.136" dyno=web.1 connect=10ms service=15ms status=500 bytes=932 mongoid.yml
development: sessions: default: database: locomotive_dev hosts: - localhost:27017 options: identity_map_enabled: true test: sessions: default: database: locomotive_test hosts: - localhost:27017 options: identity_map_enabled: true production: uri: sessions: default: database: locomotive_production hosts:
错误
500 server error基本上是服务器内部问题的所有时间（并且无法呈现您的请求）
Rails的error handling将您的所有错误路由到/public目录中名为422.html ， 404.html和500.html的一系列文件 – 代表最常见的错误
您看到500错误的原因可能是您的应用内部的任何内容。 这是我要做的修复它：
环境
您在生产中遇到错误，这意味着与环境的差异将导致问题
我首先要看看有什么变化。 通常，它是导致问题的数据库或某些环境设置（不同的数据库提供程序等）
D B
最常见的500错误是由开发和生产环境之间的DB不一致引起的。 我不知道mongoid，但是对于MYSQL / PGSQL这个问题，问题将与不在生产中迁移有关：
heroku run rake db:migrate通常可以修复生产中的大多数db问题
例外通知
有一个非常好的gem称为exception通知 （从Rails核心中提取），一块通过电子邮件发送错误通知的middlware：
#config/environments/production.rb config.middleware.use ExceptionNotification::Rack, :email => { :email_prefix => "Subject", :sender_address => %{"notifier" }, :exception_recipients => %w{your_email@email.com} }
您需要在Heroku中获取SendGrid插件并将其添加到您的production.rb ：
#config/environments/production.rb config.action_mailer.smtp_settings = { :address => 'smtp.sendgrid.net', :port => '587', :authentication => :plain, :user_name => ENV['SENDGRID_USERNAME'], :password => ENV['SENDGRID_PASSWORD'], :domain => 'heroku.com', :enable_starttls_auto => true }