ruby-on-rails - PG::Error 服务器意外关闭了连接

Question

我是 Ruby on Rails 的新手。我通过教程 通过示例学习

创建了两个基本的演示应用程序

然后它突然停止为我的新示例应用程序工作。

我已经生成了一个 Controller Pages 和两个操作 home 和 contact 并没有什么特别的。

现在，除了位于 localhost:3000 的默认 index.html rails 页面外，我无法打开任何页面。 localhost:3000/pages/home 和 localhost:3000/pages/contact 的页面返回此错误。

PG::Error

server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request.

有时(通常是在我重新启动 postgresql 时)，

PG::Error

server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request. could not send startup packet: Broken pipe

这是我的堆栈跟踪

activerecord (3.2.8) lib/active_record/connection_adapters/postgresql_adapter.rb:1213:in initialize' activerecord (3.2.8)
lib/active_record/connection_adapters/postgresql_adapter.rb:1213:in
new' activerecord (3.2.8) lib/active_record/connection_adapters/postgresql_adapter.rb:1213:in connect' activerecord (3.2.8)
lib/active_record/connection_adapters/postgresql_adapter.rb:329:in
initialize' activerecord (3.2.8) lib/active_record/connection_adapters/postgresql_adapter.rb:28:in new' activerecord (3.2.8)
lib/active_record/connection_adapters/postgresql_adapter.rb:28:in
postgresql_connection' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:309:in new_connection' activerecord (3.2.8)
lib/active_record/connection_adapters/abstract/connection_pool.rb:319:in
checkout_new_connection' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:241:in block (2 levels) in checkout' activerecord (3.2.8)
lib/active_record/connection_adapters/abstract/connection_pool.rb:236:in
loop' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:236:in block in checkout'
/home/jashwant/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:in
mon_synchronize' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:233:in checkout' activerecord (3.2.8)
lib/active_record/connection_adapters/abstract/connection_pool.rb:96:in
block in connection' /home/jashwant/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:in mon_synchronize' activerecord (3.2.8)
lib/active_record/connection_adapters/abstract/connection_pool.rb:95:in
connection' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:404:in retrieve_connection' activerecord (3.2.8)
lib/active_record/connection_adapters/abstract/connection_specification.rb:170:in
retrieve_connection' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_specification.rb:144:in connection' activerecord (3.2.8)
lib/active_record/query_cache.rb:67:inrescue in call' activerecord (3.2.8) lib/active_record/query_cache.rb:61:in call' activerecord
(3.2.8)
lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in
call' actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:28:in block in call'
activesupport (3.2.8) lib/active_support/callbacks.rb:405:in
run_3261957284442330683_call_599627944998934036__callbacks' activesupport (3.2.8) lib/active_support/callbacks.rb:405:in __run_callback' activesupport (3.2.8)
lib/active_support/callbacks.rb:385:in_run_call_callbacks' activesupport (3.2.8) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack (3.2.8)
lib/action_dispatch/middleware/callbacks.rb:27:incall' actionpack (3.2.8) lib/action_dispatch/middleware/reloader.rb:65:in call'
actionpack (3.2.8) lib/action_dispatch/middleware/remote_ip.rb:31:in
call' actionpack (3.2.8) lib/action_dispatch/middleware/debug_exceptions.rb:16:in call'
actionpack (3.2.8)
lib/action_dispatch/middleware/show_exceptions.rb:56:incall' railties (3.2.8) lib/rails/rack/logger.rb:26:in call_app' railties
(3.2.8) lib/rails/rack/logger.rb:16:incall' actionpack (3.2.8) lib/action_dispatch/middleware/request_id.rb:22:in call' rack (1.4.1)
lib/rack/methodoverride.rb:21:incall' rack (1.4.1) lib/rack/runtime.rb:17:in call' activesupport (3.2.8)
lib/active_support/cache/strategy/local_cache.rb:72:incall' rack (1.4.1) lib/rack/lock.rb:15:in call' actionpack (3.2.8)
lib/action_dispatch/middleware/static.rb:62:incall' railties (3.2.8) lib/rails/engine.rb:479:in call' railties (3.2.8)
lib/rails/application.rb:223:incall' rack (1.4.1) lib/rack/content_length.rb:14:in call' railties (3.2.8)
lib/rails/rack/log_tailer.rb:17:incall' rack (1.4.1) lib/rack/handler/webrick.rb:59:in service'
/home/jashwant/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:138:in
service' /home/jashwant/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:94:in run'
/home/jashwant/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/server.rb:191:in
block in start_thread'

我暂时不使用数据库。我尝试执行 rake db:migrate 但它返回相同的错误。

我在 Ubuntu 12.04 上(因为谷歌上的一些错误与 ubuntu 相关)

我在 SO 上发现了类似的问题，但它们处于某个高级阶段，因此涉及一些高级解决方案。

Answer 1

不过，我没有使用数据库，而是在database.yml 中的配置中指定端口解决问题。默认情况下，rails new <app_name> --database=postgresql命令不放 port那里。

这是我的配置。

development:
  adapter: postgresql
  encoding: unicode
  database: sample_app_development
  pool: 5  
  port: 5433
  username: myusername
  password: mypassword
  reconnect: true