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Frnds 我已经为我的 postgresql db 编辑了 database.yml，如下所示，并下载了 pg gem 和相关库。我在谷歌中搜索并以这种方式进行了编辑。但在运行服务器后，它在终端窗口中显示以下错误。 ......请帮助我......

development:
  adapter: postgresql
  encoding: unicode
  database: my db name
  username:  user name
  password: password
  host: host name

test:
  adapter: postgresql
  database: db_pchamara
  database: my db name
  username:  user name
  password: password
  host: host name
  pool: 5


production:
  adapter: postgresql
  database: my db name
  username:  user name
  password: password
  host: host name
  pool: 5

但是如果我在终端中运行命令'rails server'，它会显示以下错误。

Started GET "/assets/rails.png" for 127.0.0.1 at 2012-12-05 18:10:51 +0530

ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished):
  activerecord (3.2.9) lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection'
  activerecord (3.2.9) lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection'
  activerecord (3.2.9) lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection'
  activerecord (3.2.9) lib/active_record/query_cache.rb:67:in `rescue in call'
  activerecord (3.2.9) lib/active_record/query_cache.rb:61:in `call'
  activerecord (3.2.9) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
  actionpack (3.2.9) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
  activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `_run__189673354__call__558944823__callbacks'
  activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.9) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
  activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.9) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (3.2.9) lib/action_dispatch/middleware/reloader.rb:65:in `call'
  actionpack (3.2.9) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
  actionpack (3.2.9) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
  actionpack (3.2.9) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  railties (3.2.9) lib/rails/rack/logger.rb:32:in `call_app'
  railties (3.2.9) lib/rails/rack/logger.rb:16:in `block in call'
  activesupport (3.2.9) lib/active_support/tagged_logging.rb:22:in `tagged'
  railties (3.2.9) lib/rails/rack/logger.rb:16:in `call'
  actionpack (3.2.9) lib/action_dispatch/middleware/request_id.rb:22:in `call'
  rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
  rack (1.4.1) lib/rack/runtime.rb:17:in `call'
  activesupport (3.2.9) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  rack (1.4.1) lib/rack/lock.rb:15:in `call'
  actionpack (3.2.9) lib/action_dispatch/middleware/static.rb:62:in `call'
  railties (3.2.9) lib/rails/engine.rb:479:in `call'
  railties (3.2.9) lib/rails/application.rb:223:in `call'
  rack (1.4.1) lib/rack/content_length.rb:14:in `call'
  railties (3.2.9) lib/rails/rack/log_tailer.rb:17:in `call'
  rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service'
  /usr/local/rvm/rubies/ruby-1.9.3-p327/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
  /usr/local/rvm/rubies/ruby-1.9.3-p327/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
  /usr/local/rvm/rubies/ruby-1.9.3-p327/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'


  Rendered /usr/local/rvm/gems/ruby-1.9.3-p327/gems/actionpack-3.2.9/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.2ms)
  Rendered /usr/local/rvm/gems/ruby-1.9.3-p327/gems/actionpack-3.2.9/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (2.6ms)
  Rendered /usr/local/rvm/gems/ruby-1.9.3-p327/gems/actionpack-3.2.9/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (13.3ms)
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2 回答 2

1

您是否在 Gemfile 中设置了 gem 'pg'？

检查您的 Gemfile，确保您已评论（或删除）gem sqlite，并确保您列出了 gem pg

gem 'pg'

之后，运行 bundle 命令（这将设置您的应用程序在启动之前将加载的库）：

bundle

检查文件 Gemfile.lock，确保 gem pg 在那里列出。

完成所有这些后，请确保您在 postgresql 服务器中实际创建了数据库：

bundle exec rake db:create

以防万一，运行任何挂起的迁移

bundle exec rake db:migrate
于 2012-12-05T13:05:13.507 回答
0

If this helps, my database.yml is as follows:

development:
  adapter: postgresql
  encoding: utf8
  reconnect: false
  database: kenyu_dev
  pool: 5
  username: kenyu
  password: super_secret_pass
  host: localhost

Also, did you create the user and gave him the right privileges? Try logging in as the user with psql

于 2012-12-05T13:10:13.783 回答