紅寶石無法連接到Postgresql

Frnds我已編輯database.yml如下我的postgresql數據庫和下載PG寶石和相關libraries.I serached它在谷歌和編輯的方式..但後運行服務器它顯示在終端窗口下面的錯誤.......請幫我在這...紅寶石無法連接到Postgresql

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

，但如果我運行命令「軌服務器」在終端它顯示了以下錯誤。

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)

來源

2012-12-05 Pavan Kumar

嘗試使用psql連接到數據庫：'psql -h'localhost'--username'user_name''database_name''。如果它的工作原理，問題是在RoR上，而不是在PostgreSQL – macool

是啊..該命令工作正常亞.. ..它在終端控制檯上運行 –

您是否在您的Gemfile中設置了gem'pg'？

檢查你的Gemfile，請確保您的評論（或刪除）寶石sqlite的，並確保您列出了

gem 'pg'

後

寶石PG，運行bundle命令（將設置的庫，它開始之前，你的應用程序將加載）：

bundle

檢查文件Gemfile.lock的，確保創業板PG被列出。

一旦你完成了所有這一切，要確保你實際上是在你的PostgreSQL服務器創建一個數據庫：

bundle exec rake db:create

和公正的情況下，運行任何掛起的遷移

bundle exec rake db:migrate

來源

2012-12-05 13:05:13 rorra

先生如果我運行命令束它不列出postgres寶石..我試圖' bundle show postgres'..但沒有用 –

你不需要「postgres」寶石，你需要「pg」寶石。你是否在我的答案中寫過Gemfile上的寶石「pg」？如果你這樣做，當你運行命令「bundle」時，你應該看到類似「Using pg（0.14.1）」的東西，並且爲了確保你有gem，由bundle生成的文件被稱爲「Gemfile.lock 「你可以看到你的應用程序依賴的所有寶石。所以你可以運行「grep pg Gemfile.lock」，你應該看到pg gem，如果它不在那裏，那麼你的Gemfile出現了問題，請按照我的說明再試一次。 Thx – rorra

先生，我試圖通過使用'gem install pg'來安裝pg gem。它運行，它顯示寶石已成功安裝和ri文件也創建..但是當我運行捆綁它沒有顯示那裏和一件事最初我卸載sqlite3寶石，但是當我運行該包時，sqlite3寶石會自動獲取安裝..如何與這位先生一起來？ –

如果這可以幫助，我database.yml如下：

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

而且，做了喲你創建用戶並給他正確的權限？嘗試以用戶身份登錄psql

來源

2012-12-05 13:10:13 macool

是否有必要在測試和生產中給予編碼？ –

我是數據庫的超級用戶..我可以通過psql命令登錄到postgres ... butis顯示相同的錯誤 –

紅寶石無法連接到Postgresql

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