当我尝试运行rake db:migrate RAILS_ENV=production时，我得到以下错误:
root@:~/public_html/ticket# rake db:migrate RAILS_ENV='production' --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:migrate
rake aborted!
!!! Missing the mysql2 gem. Add it to your Gemfile: gem 'mysql2'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/mysql_adapter.rb:22:in `mysql_connection'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:229:in `send'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:229:in `new_connection'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:237:in `checkout_new_connection'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:191:in `checkout'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:187:in `loop'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:187:in `checkout'
/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:186:in `checkout'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:94:in `connection'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:317:in `retrieve_connection'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_specification.rb:97:in `retrieve_connection'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in `connection'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/migration.rb:488:in `initialize'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/migration.rb:435:in `new'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/migration.rb:435:in `up'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/migration.rb:417:in `migrate'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/railties/databases.rake:151
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:205:in `execute'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:158:in `invoke_with_call_chain'
/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:112:in `invoke_task'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:90:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:90:in `each'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:90:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:84:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:62:in `run'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
/usr/lib/ruby/gems/1.8/gems/rake-0.9.2/bin/rake:32
/usr/bin/rake:19:in `load'
/usr/bin/rake:19
Tasks: TOP => db:migrate
但是，在我的gem文件中我有以下内容:
gem 'mysql2', '< 0.3'
我添加了'<0.3'，因为我得到了以下错误:
Documentation: https://help.ubuntu.com/ You have mail. Last login: Tue Aug 23 14:15:09 2011 from adsl-99-142-52-152.dsl.emhril.sbcglobal.net root@:~# dir public_html rvm-installer sources root@:~# cd public_html root@:~/public_html# cd ticket root@:~/public_html/ticket# rake db:migrate RAILS_ENV=production WARNING: This version of mysql2 (0.3.7) doesn't ship with the ActiveRecord adapter bundled anymore as it's now part of Rails 3.1 WARNING: Please use the 0.2.x releases if you plan on using it in Rails <= 3.0.x rake aborted! !!! Missing the mysql2 gem. Add it to your Gemfile: gem 'mysql2
我已经尝试了捆绑安装:
gem 'mysql2', '< 0.3'
gem 'mysql2'
我真的不知道还能试什么
您是否可以尝试将现有的mysql2 gem包含替换为这一行到您的Gemfile:
gem "mysql2", "~> 0.2.7"
into app execute
install bundle
哇!找到问题所在了。http://dalibornasevic.com/posts/19-runtimeerror-missing-the-mysql2-gem我的适配器应该在yml文件中设置为mysql2