Rails mysql适配器错误

分类：编程问答

如何解决Rails mysql适配器错误

| 我在寻找解决此问题的方法时遇到了麻烦。我遇到了错误   请安装mysql适配器：\'gem install activerecord-mysql-adapter \' 当我在
Gemfile
中指定
ruby-mysql
或
mysql2
时。自从我升级到Rails 3.1.0-rc1以来，这种情况才发生。我正在运行OSX 10.6，Ruby 1.9.2。 
cody$ rails c
/Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/connection_specification.rb:71:in `rescue in establish_connection\': Please install the mysql adapter: `gem install activerecord-mysql-adapter` (mysql is not part of the bundle. Add it to Gemfile.) (RuntimeError)
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/connection_specification.rb:68:in `establish_connection\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/connection_specification.rb:60:in `establish_connection\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/connection_specification.rb:55:in `establish_connection\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/railtie.rb:69:in `block (2 levels) in <class:Railtie>\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc1/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc1/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc1/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc1/lib/active_support/lazy_load_hooks.rb:42:in `each\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc1/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/base.rb:2135:in `<top (required)>\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/railtie.rb:34:in `block in <class:Railtie>\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/railtie.rb:177:in `call\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/railtie.rb:177:in `block in load_console\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/railtie.rb:177:in `each\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/railtie.rb:177:in `load_console\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/application.rb:115:in `block in load_console\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/application/railties.rb:8:in `each\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/application/railties.rb:8:in `all\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/application.rb:115:in `load_console\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/commands/console.rb:26:in `start\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/commands/console.rb:8:in `start\'
from /Users/cody/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/commands.rb:40:in `<top (required)>\'
from script/rails:6:in `require\'
from script/rails:6:in `<main>\'
这是
gem env
输出 
cody$ gem env
RubyGems Environment:
- RUBYGEMS VERSION: 1.6.2
- RUBY VERSION: 1.9.2 (2011-02-18 patchlevel 180) [x86_64-darwin10.7.3]
- INSTALLATION DIRECTORY: /Users/cody/.rvm/gems/ruby-1.9.2-p180
- RUBY EXECUTABLE: /Users/cody/.rvm/rubies/ruby-1.9.2-p180/bin/ruby
- EXECUTABLE DIRECTORY: /Users/cody/.rvm/gems/ruby-1.9.2-p180/bin
- RUBYGEMS PLATFORMS:
  - ruby
  - x86_64-darwin-10
- GEM PATHS:
   - /Users/cody/.rvm/gems/ruby-1.9.2-p180
   - /Users/cody/.rvm/gems/ruby-1.9.2-p180@global
- GEM CONFIGURATION:
   - :update_sources => true
   - :verbose => true
   - :benchmark => false
   - :backtrace => false
   - :bulk_threshold => 1000
   - :sources => [\"http://gems.rubyforge.org/\",\"http://gems.github.com\"]
- REMOTE SOURCES:
   - http://gems.rubyforge.org/
   - http://gems.github.com
    

解决方法

我不得不强制使用mysql2 gem版本0.2.7，并尝试将rails 3.0.7应用程序升级到3.1.0.rc1时，我还注意到，您在Gemfile中也需要以下新gems ： 
gem \'mysql2\',\'< 0.3\' # as stated above

# Asset template engines
gem \'json\'
gem \'sass\'
gem \'coffee-script\'
gem \'uglifier\'
# other required things for rails 3.1
gem \'jquery-rails\'
gem \'mustang\' # this is ONE execjs backend of many,and the only one that worked for me.
告诉我那是否对您有用。     ,您必须更改ѭ7才能使用
mysql2
适配器而不是
mysql
。 因此，请替换： 
adapter: mysql
带有： 
adapter: mysql2
    ,通过更新我的应用程序的gemfile以将mysql2标识为捆绑包的一部分来解决该问题。 为此，请导航至应用程序的根目录，然后运行
open gemfile
 在宝石线的正下方添加the13 gem线。 在应用程序根目录的终端中，运行
bundle install
 运行ѭ15来验证捆绑包是否有效。您现在可以使用适配器了。 我的环境是Rails 3.1，MySql 5.5，Ruby 1.9.2。     ,我在Windows上创建了一个Rails项目，并将其移至运行Fedora的计算机上。我通过将\“ Gemfile.lock \”重命名为\“ old_Gemfile.lock \”解决了这个问题。当然，您仍然必须将适配器指定为\'mysql2 \'，并将适当的gem包含在gemfile中。     

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