Ruby on rails 未定义的方法'mysql#u connection'；对于ActiveRecord:：Base:Class_Ruby On Rails_Ruby_Ruby On Rails 3_Activerecord_Gem

Ruby on rails 未定义的方法'mysql#u connection'；对于ActiveRecord:：Base:Class

ruby-on-rails ruby ruby-on-rails-3 activerecord

Ruby on rails 未定义的方法'mysql#u connection'；对于ActiveRecord:：Base:Class,ruby-on-rails,ruby,ruby-on-rails-3,activerecord,gem,Ruby On Rails,Ruby,Ruby On Rails 3,Activerecord,Gem,我已经将rails2升级到rails3，当我尝试rake db:migrate时，我发现以下错误 `rake aborted!` undefined method `mysql_connection' for ActiveRecord::Base:Class /home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/dynamic_matchers.rb:55:in `met

我已经将rails2升级到rails3，当我尝试rake db:migrate时，我发现以下错误

`rake aborted!`

undefined method `mysql_connection' for ActiveRecord::Base:Class
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/dynamic_matchers.rb:55:in `method_missing'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:315:in `new_connection'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:325:in `checkout_new_connection'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:247:in `block (2 levels) in checkout'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `loop'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `block in checkout'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:239:in `checkout'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:102:in `block in connection'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_pool.rb:101:in `connection'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:153:in `select_connection'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:215:in `method_missing'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/migration.rb:662:in `initialize'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/migration.rb:570:in `new'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/migration.rb:570:in `up'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/migration.rb:117:in `up_with_octopus'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/migration.rb:551:in `migrate'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/migration.rb:111:in `block in migrate_with_octopus'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:171:in `run_queries_on_shard'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:180:in `block in send_queries_to_multiple_shards'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:179:in `each'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:179:in `send_queries_to_multiple_shards'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/migration.rb:110:in `migrate_with_octopus'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/railties/databases.rake:193:in `block (2 levels) in <top (required)>'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/bin/ruby_executable_hooks:15:in `eval'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/bin/ruby_executable_hooks:15:in `<main>'

Tasks: TOP => db:migrate
(See full trace by running task with --trace)`

`rake中止`
ActiveRecord:：Base:类的未定义方法“mysql\u connection”
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_-record/dynamic_-matchers.rb:55:in'method_-missing'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active\u record/connection\u adapters/abstract/connection\u pool.rb:315:in'new\u connection'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active\u record/connection\u adapters/abstract/connection\u pool.rb:325:在“签出新连接”中
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active\u record/connection\u adapters/abstract/connection\u pool.rb:247:在“签出中的块（2个级别）”中
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active\u record/connection\u adapters/abstract/connection\u pool.rb:242:in'loop'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active\u record/connection\u adapters/abstract/connection\u pool.rb:242:在“签出中的块”中
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active\u record/connection\u adapters/abstract/connection\u pool.rb:239:in'checkout'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active\u record/connection\u adapters/abstract/connection\u pool.rb:102:在“连接中的块”中
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active\u record/connection\u adapters/abstract/connection\u pool.rb:101:in'connection'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:153:在“选择连接”中
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:215:in'method_missing'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/migration.rb:662:in'initialize'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_-record/migration.rb:570:in'new'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/migration.rb:570:in'up'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/migration.rb:117:in'up_with_octopus'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_-record/migration.rb:551:in'migrate'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/migration.rb:111:in'block in migrate_with_octopus'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:171:in'run\u querys\u on\u shard'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:180:in`block in send\u querys\u to\u multiple\u shard'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:179:in'each'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/proxy.rb:179:in'send_querys_to_multiple_shard'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/ar-octopus-0.6.1/lib/octopus/migration.rb:110:in'migrate_with_octopus'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/activerecord-3.2.14/lib/active_record/railties/databases.rake:193:in'block（2层）in'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/bin/ruby可执行文件挂钩：15:in'eval'
/home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/bin/ruby\u可执行文件\u挂钩：15:in`'
任务：TOP=>db:migrate
（通过使用--trace运行任务查看完整跟踪）`

这是我的database.yml文件发展：

适配器：mysql2

数据库：db

用户名：root

密码：

socket:/opt/lampp/var/mysql/mysql.sock

将其包含在具有奇异字符的文件中

#encoding: utf-8

希望这有帮助

谢谢大家错误已解决，因为存在gem依赖项问题

我使用了gem mysql2，activerecord-mysql2-adapter，mysql因此存在冲突错误，我只使用mysql2 gem将适配器mysql更改为mysql2

检查：您是否使用“mysql2”gem？Thanx作为回复，但我已经使用mysql2 gem，并且应用程序运行成功，但在迁移时它给出了上述错误。您可以显示您的数据库吗？yml？我已附加了我的数据库文件