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Question

我试着在这里学习ruby on rails，并按照视频教程学习，但似乎无法让环境运行。我已经使用rails新的project_name创建了一个项目，但是当我运行rails服务器时，我实际上不能让它工作。

我得到的信息如下：

drew$  rails server
/usr/local/lib/ruby/gems/1.9.1/gems/mysql2-0.3.7/lib/mysql2.rb:9:in `require': dlopen(/usr/local/lib/ruby/gems/1.9.1/gems/mysql2-0.3.7/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib (LoadError)
  Referenced from: /usr/local/lib/ruby/gems/1.9.1/gems/mysql2-0.3.7/lib/mysql2/mysql2.bundle
  Reason: image not found - /usr/local/lib/ruby/gems/1.9.1/gems/mysql2-0.3.7/lib/mysql2/mysql2.bundle
    from /usr/local/lib/ruby/gems/1.9.1/gems/mysql2-0.3.7/lib/mysql2.rb:9:in `<top (required)>'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.18/lib/bundler/runtime.rb:68:in `require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.18/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.18/lib/bundler/runtime.rb:66:in `each'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.18/lib/bundler/runtime.rb:66:in `block in require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.18/lib/bundler/runtime.rb:55:in `each'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.18/lib/bundler/runtime.rb:55:in `require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.18/lib/bundler.rb:120:in `require'
    from /Users/andrewdellostritto/Sites/simple_cms/config/application.rb:7:in `<top (required)>'
    from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.1.0/lib/rails/commands.rb:52:in `require'
    from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.1.0/lib/rails/commands.rb:52:in `block in <top (required)>'
    from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.1.0/lib/rails/commands.rb:49:in `tap'
    from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.1.0/lib/rails/commands.rb:49:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

有人能帮上忙吗？提前感谢！

Answer 1

看起来您的mysql2 gem没有正确安装。Take a look at this question。我不确定你的环境是什么样的，但是如果你用的是windows，看看第二个答案。我认为这将适用于您。

Answer 2

libmysqlclient.18.dylib不在您的路径中。您需要将mysql lib目录添加到环境变量：DYLD_LIBRARY_PATH (Mac )或LD_LIBRARY_PATH (Linux)。

假设您的mysql安装在/usr/local/mysql/中，请执行以下操作：

# Linux
export LD_LIBRARY_PATH="/usr/local/mysql/lib/:$LD_LIBRARY_PATH"
# Mac OS X
export DYLD_LIBRARY_PATH="/usr/local/mysql/lib/:$DYLD_LIBRARY_PATH"

Answer 3

可能是您没有正确安装mysql或检查您的ruby版本是否支持rails版本.....