localhost:3000 500 内部服务器错误

Question

我想我把事情搞砸了。我已经使用这个命令rails new app --database=postgresql 很长时间了，我是一个快乐的男孩。但是今天我忘记生成一个应用程序来使用postgresql。现在每次我运行rails new app --database=postgresql 并转到http://localhost:3000/ 时，我都会受到欢迎

500 Internal Server Error 如果您是此服务器的管理员 网站，然后请阅读此 Web 应用程序的日志文件和/或 Web 服务器的日志文件以找出问题所在。

我检查了日志，我有这样的东西：

Started GET "/" for ::1 at 2015-06-18 23:11:56 +0200

ActiveRecord::NoDatabaseError (FATAL:  database "toy_development" does not exist
):
  activerecord (4.2.1) lib/active_record/connection_adapters/postgresql_adapter.rb:661:in `rescue in connect'
  activerecord (4.2.1) lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `connect'
  activerecord (4.2.1) lib/active_record/connection_adapters/postgresql_adapter.rb:242:in `initialize'
  activerecord (4.2.1) lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `new'
  activerecord (4.2.1) lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `postgresql_connection'
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in `new_connection'
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in `checkout_new_connection'
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:422:in `acquire_connection'
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:349:in `block in checkout'
  /Users/siaw/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in `checkout'
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in `block in connection'
  /Users/siaw/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in `connection'
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:567:in `retrieve_connection'
  activerecord (4.2.1) lib/active_record/connection_handling.rb:113:in `retrieve_connection'
  activerecord (4.2.1) lib/active_record/connection_handling.rb:87:in `connection'
  activerecord (4.2.1) lib/active_record/migration.rb:384:in `connection'
  activerecord (4.2.1) lib/active_record/migration.rb:371:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.2.1) lib/active_support/callbacks.rb:88:in `call'
  activesupport (4.2.1) lib/active_support/callbacks.rb:88:in `_run_callbacks'
  activesupport (4.2.1) lib/active_support/callbacks.rb:776:in `_run_call_callbacks'
  activesupport (4.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (4.2.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/reloader.rb:73:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  web-console (2.1.3) lib/web_console/middleware.rb:37:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.2.1) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.2.1) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.2.1) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.6.3) lib/rack/methodoverride.rb:22:in `call'
  rack (1.6.3) lib/rack/runtime.rb:18:in `call'
  activesupport (4.2.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
  rack (1.6.3) lib/rack/lock.rb:17:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/static.rb:113:in `call'
  rack (1.6.3) lib/rack/sendfile.rb:113:in `call'
  railties (4.2.1) lib/rails/engine.rb:518:in `call'
  railties (4.2.1) lib/rails/application.rb:164:in `call'
  rack (1.6.3) lib/rack/lock.rb:17:in `call'
  rack (1.6.3) lib/rack/content_length.rb:15:in `call'
  rack (1.6.3) lib/rack/handler/webrick.rb:88:in `service'
  /Users/siaw/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'
  /Users/siaw/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'
  /Users/siaw/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'


  Rendered /Users/siaw/.rvm/gems/ruby-2.2.0/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (15.2ms)

然后我启动psql 来创建一个名为toy_development 的数据库。 toy 是我的应用程序的名称。创建该数据库后。我再次尝试在浏览器中加载localhost。然后现在我明白了：

Started GET "/" for ::1 at 2015-06-18 23:18:17 +0200

ArgumentError (wrong number of arguments (2 for 1)):
  actionpack (4.2.1) lib/action_dispatch/http/request.rb:338:in `parse_query'
  rack (1.6.3) lib/rack/request.rb:191:in `GET'
  actionpack (4.2.1) lib/action_dispatch/http/request.rb:300:in `GET'
  actionpack (4.2.1) lib/action_dispatch/http/parameters.rb:14:in `parameters'
  actionpack (4.2.1) lib/action_dispatch/http/filter_parameters.rb:37:in `filtered_parameters'
  actionpack (4.2.1) lib/action_controller/metal/instrumentation.rb:22:in `process_action'
  actionpack (4.2.1) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
  activerecord (4.2.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (4.2.1) lib/abstract_controller/base.rb:137:in `process'
  actionview (4.2.1) lib/action_view/rendering.rb:30:in `process'
  actionpack (4.2.1) lib/action_controller/metal.rb:196:in `dispatch'
  actionpack (4.2.1) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
  actionpack (4.2.1) lib/action_controller/metal.rb:237:in `block in action'
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:74:in `call'
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:74:in `dispatch'
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:43:in `serve'
  actionpack (4.2.1) lib/action_dispatch/journey/router.rb:43:in `block in serve'
  actionpack (4.2.1) lib/action_dispatch/journey/router.rb:30:in `each'
  actionpack (4.2.1) lib/action_dispatch/journey/router.rb:30:in `serve'
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:819:in `call'
  rack (1.6.3) lib/rack/etag.rb:24:in `call'
  rack (1.6.3) lib/rack/conditionalget.rb:25:in `call'
  rack (1.6.3) lib/rack/head.rb:13:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/flash.rb:260:in `call'
  rack (1.6.3) lib/rack/session/abstract/id.rb:225:in `context'
  rack (1.6.3) lib/rack/session/abstract/id.rb:220:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/cookies.rb:560:in `call'
  activerecord (4.2.1) lib/active_record/query_cache.rb:36:in `call'
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:649:in `call'
  activerecord (4.2.1) lib/active_record/migration.rb:378:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.2.1) lib/active_support/callbacks.rb:88:in `call'
  activesupport (4.2.1) lib/active_support/callbacks.rb:88:in `_run_callbacks'
  activesupport (4.2.1) lib/active_support/callbacks.rb:776:in `_run_call_callbacks'
  activesupport (4.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (4.2.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/reloader.rb:73:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  web-console (2.1.3) lib/web_console/middleware.rb:37:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.2.1) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.2.1) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.2.1) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.6.3) lib/rack/methodoverride.rb:22:in `call'
  rack (1.6.3) lib/rack/runtime.rb:18:in `call'
  activesupport (4.2.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
  rack (1.6.3) lib/rack/lock.rb:17:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/static.rb:113:in `call'
  rack (1.6.3) lib/rack/sendfile.rb:113:in `call'
  railties (4.2.1) lib/rails/engine.rb:518:in `call'
  railties (4.2.1) lib/rails/application.rb:164:in `call'
  rack (1.6.3) lib/rack/lock.rb:17:in `call'
  rack (1.6.3) lib/rack/content_length.rb:15:in `call'
  rack (1.6.3) lib/rack/handler/webrick.rb:88:in `service'
  /Users/siaw/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'
  /Users/siaw/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'
  /Users/siaw/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'


  Rendered /Users/siaw/.rvm/gems/ruby-2.2.0/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (13.8ms)

我需要一些帮助。 :)

Answer 1

我发现 Bundler 将我的 rack 版本更新为 rack (1.6.3)，因此我在 Gemfile.lock 中将其手动更改回 rack (1.6.2)。在 Rails 团队修复它之前，这应该可以让一切正常工作。

Answer 2

如前所述，您使用 postgresql 作为数据库默认情况下不会创建它 database 。 如果您使用 sqlite3 作为数据库，情况就不会如此

bundle exec rake db:create

那么，

bundle exec rake db:migrate