Rails noob having trouble with WEBrick and mySQL

StackOverflow https://stackoverflow.com/questions/16312704

  •  13-04-2022
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Question

I'm very new to rails and am trying to familiarize myself with the framework by following the Rails Essential Training on Lynda.com. Although I thought that I got everything installed properly, I am running into some trouble when trying to launch a WEBrick server. The problem seems to be with mySQL, because I get an error right after it exits on me and I have no idea what it's trying to tell me. If someone could have a look at the error and recommend any possible solutions it would be very much appreciated!!

I am running:
OSX Mountain Lion
Ruby 2.0
Rails 3.2.13
mysql Ver 14.14 Distrib 5.6.10, for osx10.8 

    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

I have tried using the rake db:create command but that seems to open up a whole new bag of issues.

Was it helpful?

Solution

The database you are trying to connect to doesn't exist:

Unknown database 'simple_cms_development'

Can you check if it in fact exists and if your settings in config/database.yml are correct ? That may be also the reason why rake db:create also fails (would be useful to paste the errors that you get from it).

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