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我已经安装了 ruby​​ 和 rails，当我尝试运行时，我的应用程序给了我一个错误

耙分贝：迁移

这是命令 rake db:migrate --trace 的结果

** Execute db:migrate
rake aborted!
!!! Missing the mysql2 gem. Add it to your Gemfile: gem 'mysql2'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/connection_adapters/mysql_adapter.rb:22:in `rescue in mysql_connection'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/connection_adapters/mysql_adapter.rb:19:in `mysql_connection'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:229:in `new_connection'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:237:in `checkout_new_connection'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:191:in `block (2 levels) in checkout'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:187:in `loop'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:187:in `block in checkout'
/usr/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:186:in `checkout'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:94:in `connection'
/usr/lib/ruby/gems/1.9.1/gems/ar-octopus-0.3.4/lib/octopus/proxy.rb:83:in `select_connection'
/usr/lib/ruby/gems/1.9.1/gems/ar-octopus-0.3.4/lib/octopus/proxy.rb:177:in `send_queries_to_selected_slave'
/usr/lib/ruby/gems/1.9.1/gems/ar-octopus-0.3.4/lib/octopus/proxy.rb:140:in `method_missing'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/migration.rb:454:in `get_all_versions'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/migration.rb:583:in `migrated'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/migration.rb:492:in `current_version'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/migration.rb:509:in `block in migrate'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/migration.rb:509:in `each'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/migration.rb:509:in `detect'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/migration.rb:509:in `migrate'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/migration.rb:433:in `up'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/migration.rb:415:in `migrate'
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.0.6/lib/active_record/railties/databases.rake:142:in `block (2 levels) in <top (required)>'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:636:in `block in execute'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:597:in `block in invoke_with_call_chain'
/usr/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2029:in `block (2 levels) in top_level'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2029:in `block in top_level'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2001:in `block in run'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.8.7/bin/rake:31:in `<top (required)>'
/usr/bin/rake:19:in `load'
/usr/bin/rake:19:in `<main>'
confiz@confiz-desktop:~/mango_apps/rails_app_sms$ .
bash: .: filename argument required
.: usage: . filename [arguments]

我已经在我的 gemfile 中提到了 gem，并且已经执行了 bundle install。

我的 database.yml 文件已经有正确的适配器，即适配器：mysql2

请帮我解决这个问题。

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1 回答 1

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如果我在 Gemfile 中使用 mysql2 v 0.2.19b4，我会发现同样的问题。如果我使用最新的 mysql2，这与由 Hobo（生成我的 Gemfile）规定的 rails 3.0.17 冲突。我从中得到的警告是：

This version of mysql2 (0.3.11) doesn't ship with the ActiveRecord adapter bundled anymore as it's now part of Rails 3.1. Please use the 0.2.x releases if you plan on using it in Rails <= 3.0.x

回到 mysql2 v 0.2.x 最初的加载错误是因为 rails mysql_adapter 调用require 'mysql'not require 'mysql2'。

解决方法是 gem 'mysql'不在gem 'mysql2'Gemfile中使用

在我的情况下，捆绑器用户 gem mysql v 2.8.1 一切正常。

于 2012-11-02T14:45:07.430 回答