Rails noob遇到了WEBrick和MySQL的麻煩

Question

我是Rails的新手，並正在通過Lynda.com上的Rails基本培訓來熟悉該框架。 盡管我以為我已正確安裝了所有程序，但是在嘗試啟動WEBrick服務器時遇到了一些麻煩。 問題似乎出在mySQL上，因為它退出后立即出現錯誤，我也不知道它要告訴我什么。 如果有人可以看一下錯誤並推薦任何可能的解決方案，將不勝感激！

我在跑步：
OSX山獅
Ruby 2.0
導軌3.2.13
適用於osx10.8的mysql Ver 14.14 Distrib 5.6.10

    adamcord$ rails s
=> Booting WEBrick
=> Rails 3.2.13 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/Library/Ruby/Gems/1.8/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `connect': Unknown database 'simple_cms_development' (Mysql2::Error)
    from /Library/Ruby/Gems/1.8/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `initialize'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `new'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `mysql2_connection'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:315:in `send'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:315:in `new_connection'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:325:in `checkout_new_connection'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:247:in `checkout'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `loop'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `checkout'
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:239:in `checkout'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:102:in `connection'
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:101:in `connection'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection'
    from /Library/Ruby/Gems/1.8/gems/activerecord-3.2.13/lib/active_record/railtie.rb:88
    from /Library/Ruby/Gems/1.8/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `instance_exec'
    from /Library/Ruby/Gems/1.8/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `run'
    from /Library/Ruby/Gems/1.8/gems/railties-3.2.13/lib/rails/initializable.rb:55:in `run_initializers'
    from /Library/Ruby/Gems/1.8/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `each'
    from /Library/Ruby/Gems/1.8/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `run_initializers'
    from /Library/Ruby/Gems/1.8/gems/railties-3.2.13/lib/rails/application.rb:136:in `initialize!'
    from /Library/Ruby/Gems/1.8/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `send'
    from /Library/Ruby/Gems/1.8/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `method_missing'
    from /Users/adamcord/Desktop/Course Work/Lynda.com Exercises/Sites/simple_cms/config/environment.rb:5
    from /Users/adamcord/Desktop/Course Work/Lynda.com Exercises/Sites/simple_cms/config.ru:3:in `require'
    from /Users/adamcord/Desktop/Course Work/Lynda.com Exercises/Sites/simple_cms/config.ru:3
    from /Library/Ruby/Gems/1.8/gems/rack-1.4.5/lib/rack/builder.rb:51:in `instance_eval'
    from /Library/Ruby/Gems/1.8/gems/rack-1.4.5/lib/rack/builder.rb:51:in `initialize'
    from /Users/adamcord/Desktop/Course Work/Lynda.com Exercises/Sites/simple_cms/config.ru:0:in `new'
    from /Users/adamcord/Desktop/Course Work/Lynda.com Exercises/Sites/simple_cms/config.ru:0

我嘗試使用rake db:create命令，但這似乎帶來了一個全新的問題。

Answer 1

您嘗試連接的數據庫不存在：

未知的數據庫'simple_cms_development'

您可以檢查它是否確實存在，以及您在config / database.yml中的設置是否正確嗎？ 這也可能是rake db：create也失敗的原因（粘貼從中獲取的錯誤很有用）。