Rails/MySQL2:错误 - 未知数据库

Question

我正在关注Linda的基础教程.我现在能够正确安装所有东西,但是当我启动Rails服务器时,我在访问时收到此消息localhost:3000:

Unknown database 'simple_cms_development'

然后

Rendered /Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.0ms)
Rendered /Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (23.5ms)
Rendered /Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (29.8ms)

Answer 1

你在MySQL中创建了数据库吗？您应该能够运行rake db:create并让Rails为您创建它.

Answer 2

我有同样的错误,请在命令提示符上运行以下命令:

rake db:create 

解决问题.

Answer 3

寻找以下问题的答案：

1. 您安装了mysql2 gem吗？
2. 您的Gemfile中有提及吗？
3. 您运行命令了rake db:create吗？