Mac OS X Snow Leopard 上的 Rails：mysql2.bundle dlsym - 未找到符号（LoadError）

Question

• 平台：Mac OS X (macosx) 10.6.6
• Ruby：1.9.2
• Rails：3.0.3
• 使用 RVM

这是我收到的错误：

$ rails s
/Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.2.7/lib/mysql2/mysql2.bundle: dlsym(0x13782a0, Init_mysql2): symbol not found - /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.2.7/lib/mysql2/mysql2.bundle (LoadError)
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.2.7/lib/mysql2.rb:8
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.13/lib/bundler/runtime.rb:68:in `require'
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.13/lib/bundler/runtime.rb:68:in `require'
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.13/lib/bundler/runtime.rb:66:in `each'
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.13/lib/bundler/runtime.rb:66:in `require'
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.13/lib/bundler/runtime.rb:55:in `each'
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.13/lib/bundler/runtime.rb:55:in `require'
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/bundler-1.0.13/lib/bundler.rb:120:in `require'
from /Users/nicolas/git/hits/config/application.rb:7
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.6/lib/rails/commands.rb:28:in `require'
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.6/lib/rails/commands.rb:28
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.6/lib/rails/commands.rb:27:in `tap'
from /Users/nicolas/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.6/lib/rails/commands.rb:27
from script/rails:6:in `require'
from script/rails:6

这是一个非常持久的错误。以下是一些可能有助于解决此问题的更多信息：

• 我过去曾从 Leopard 升级到 Snow Leopard。
• 我尝试过捆绑安装。
• 我尝试删除 ~/.rvm 并重新安装 RVM
• 我尝试过： env ARCHFLAGS="-arch x86_64" gem install mysql2 -v 0.2.7
• 我尝试安装最新的 mysql (mysql-5.5.12-osx10.6- x86_64.dmg）在任何之上 mysql 之前就存在于我的系统上

以下是有关我的系统的更多信息：

$ echo $DYLD_LIBRARY_PATH
/usr/local/mysql/lib:

$ file ~/.rvm/rubies/default/bin/ruby 
/Users/nicolas/.rvm/rubies/default/bin/ruby: Mach-O 64-bit executable x86_64

$ file /usr/local/mysql/lib/libmysqlclient.18.dylib
/usr/local/mysql/lib/libmysqlclient.18.dylib: Mach-O 64-bit dynamically linked shared library x86_64

$ rvm list
rvm rubies
=> ruby-1.9.2-p180 [ x86_64 ]

$ which ruby
/opt/local/bin/ruby

$ file /opt/local/bin/ruby
/opt/local/bin/ruby: Mach-O executable i386

Answer 1

which ruby​​ 表示您使用的不是 RVM 提供的 ruby​​。安装 RVM 和 ruby​​ 后，你必须告诉 RVM 使用它：

rvm use --default 1.9.2

如果你还没有在 RVM 上安装 ruby​​ 那么你必须在使用之前安装它：

rvm install 1.9.2

之后你可能需要再次安装 Rails，因为你当前的版本可能是随系统 ruby​​ 而不是 RVM 一起安装的。