在本地主機上運行rails應用程序

Question

嘿傢伙noob問題在這裏。 我遇到問題啓動rails s。我認爲它是一個MySQL問題，但是當我檢查它的那個時候的gem 'mysql'的gemfile文件。

我粘貼控制檯日誌如下：

$ rails s 
=> Booting WEBrick 
=> Rails 3.2.2 application starting in development on http://0.0.0.0:3000 
=> Call with -d to detach 
=> Ctrl-C to shutdown server 
/Users/username/Sites/projectname/config/initializers/omniauth.rb:2: warning: already initialized constant VERIFY_PEER 
[2012-05-19 18:33:15] INFO WEBrick 1.3.1 
[2012-05-19 18:33:15] INFO ruby 1.9.3 (2012-04-20) [x86_64-darwin11.3.0] 
[2012-05-19 18:33:15] INFO WEBrick::HTTPServer#start: pid=74815 port=3000 


Started GET "/" for 127.0.0.1 at 2012-05-19 18:33:30 -0400 

NoMethodError (undefined method `init' for Mysql:Class): 
activerecord (3.2.2) lib/active_record/connection_adapters/mysql_adapter.rb:32:in `mysql_connection' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:277:in `new_connection' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:287:in `checkout_new_connection' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:235:in `block (2 levels) in checkout' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:230:in `loop' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:230:in `block in checkout' 
/Users/gorteks/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:229:in `checkout' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:95:in `connection' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:374:in `retrieve_connection' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_specification.rb:168:in `retrieve_connection' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_specification.rb:142:in `connection' 
activerecord (3.2.2) lib/active_record/query_cache.rb:67:in `rescue in call' 
activerecord (3.2.2) lib/active_record/query_cache.rb:61:in `call' 
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in `call' 
actionpack (3.2.2) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
activesupport (3.2.2) lib/active_support/callbacks.rb:405:in `_run__2560155742155290980__call__1944809023615832682__callbacks' 
activesupport (3.2.2) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.2) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
activesupport (3.2.2) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.2) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (3.2.2) lib/action_dispatch/middleware/reloader.rb:65:in `call' 
actionpack (3.2.2) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
actionpack (3.2.2) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
actionpack (3.2.2) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
railties (3.2.2) lib/rails/rack/logger.rb:26:in `call_app' 
railties (3.2.2) lib/rails/rack/logger.rb:16:in `call' 
actionpack (3.2.2) 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 (3.2.2) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.4.1) lib/rack/lock.rb:15:in `call' 
actionpack (3.2.2) lib/action_dispatch/middleware/static.rb:61:in `call' 
railties (3.2.2) lib/rails/engine.rb:479:in `call' 
railties (3.2.2) lib/rails/application.rb:220:in `call' 
rack (1.4.1) lib/rack/content_length.rb:14:in `call' 
railties (3.2.2) lib/rails/rack/log_tailer.rb:14:in `call' 
rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service' 
/Users/gorteks/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' 
/Users/gorteks/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' 
/Users/gorteks/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' 


Rendered /Users/gorteks/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.2/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.6ms) 
Rendered /Users/gorteks/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.2/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.7ms) 
Rendered /Users/gorteks/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.2/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (8.7ms) 

當訪問本地主機我看到這一點：

NoMethodError 

undefined method `init' for Mysql:Class 

Rails.root: /Users/username/Sites/projectname 
Application Trace | Framework Trace | Full Trace 

Request 

Parameters: 

None 

Show session dump 

Show env dump 
Response 

Headers: 

None 

感謝您的幫助！我卡住了！

Answer 1

您應該使用mysql2寶石作爲您正在使用的Rails版本，而不是使用mysql寶石。只需進行切換即可解決您的問題。