mysql2导轨上的Gem错误

Question

我想继续对导轨应用程序进行编程，但是当我尝试启动服务器rails s时发生以下错误。

当我有一个全新的目录（它在那里使用sqlite3）时，我的导轨安装似乎工作正常。我也可能已经安装了一切，Xcode的，自制的，RVM ...

操作系统：OS X，1.8.2

任何想法来解决这个问题？

/Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `connect': Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) (Mysql2::Error) 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `initialize' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `new' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `mysql2_connection' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:315:in `new_connection' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:325:in `checkout_new_connection' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:247:in `block (2 levels) in checkout' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `loop' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `block in checkout' 
    from /Users/myself/.rvm/rubies/ruby-1.9.3-p327/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:239:in `checkout' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:102:in `block in connection' 
    from /Users/myself/.rvm/rubies/ruby-1.9.3-p327/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:101:in `connection' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/model_schema.rb:308:in `clear_cache!' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/railtie.rb:97:in `block (2 levels) in <class:Railtie>' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:418:in `_run__4072264347074867870__prepare__1617522906049658136__callbacks' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:405:in `__run_callback' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:385:in `_run_prepare_callbacks' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.9/lib/active_support/callbacks.rb:81:in `run_callbacks' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/actionpack-3.2.9/lib/action_dispatch/middleware/reloader.rb:74:in `prepare!' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/actionpack-3.2.9/lib/action_dispatch/middleware/reloader.rb:48:in `prepare!' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/application/finisher.rb:47:in `block in <module:Finisher>' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/initializable.rb:30:in `instance_exec' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/initializable.rb:30:in `run' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/initializable.rb:55:in `block in run_initializers' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/initializable.rb:54:in `each' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/initializable.rb:54:in `run_initializers' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/application.rb:136:in `initialize!' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/railtie/configurable.rb:30:in `method_missing' 
    from /Users/myself/events/config/environment.rb:5:in `<top (required)>' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:251:in `require' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:251:in `block in require' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:236:in `load_dependency' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:251:in `require' 
    from /Users/myself/events/config.ru:4:in `block in <main>' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/builder.rb:51:in `instance_eval' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize' 
    from /Users/myself/events/config.ru:1:in `new' 
    from /Users/myself/events/config.ru:1:in `<main>' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/builder.rb:40:in `eval' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/builder.rb:40:in `parse_file' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/server.rb:200:in `app' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/commands/server.rb:46:in `app' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/server.rb:252:in `start' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/commands/server.rb:70:in `start' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/commands.rb:55:in `block in <top (required)>' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/commands.rb:50:in `tap' 
    from /Users/myself/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/commands.rb:50:in `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>' 

Answer 1

的位置是在OSX上的不同，寻找/private/var/mysql/mysql.sock

您的选项是改变套接字值在database.yml中或在创建/ tmp目录的符号链接/myslq.sock

我更喜欢后者，因为这是一个常见问题。