我一直关注视频教程并创建了数据库，但在尝试按照步骤转到目录并输入rake: dbmigrate时
我收到一个错误。
Ians-MacBook-Pro:music_library iansherwood$ rake db migrate
rake aborted!
dlopen(/Users/iansherwood/Sites/music_library/vendor/bundle/ruby/1.9.1/gems/mysql2-0.3.13/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib
Referenced from: /Users/iansherwood/Sites/music_library/vendor/bundle/ruby/1.9.1/gems/mysql2-0.3.13/lib/mysql2/mysql2.bundle
Reason: image not found - /Users/iansherwood/Sites/music_library/vendor/bundle/ruby/1.9.1/gems/mysql2-0.3.13/lib/mysql2/mysql2.bundle
/Users/iansherwood/Sites/music_library/vendor/bundle/ruby/1.9.1/gems/mysql2-0.3.13/lib/mysql2.rb:8:in `require'
/Users/iansherwood/Sites/music_library/vendor/bundle/ruby/1.9.1/gems/mysql2-0.3.13/lib/mysql2.rb:8:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p392@global/gems/bundler-1.2.4/lib/bundler/runtime.rb:68:in `require'
/usr/local/rvm/gems/ruby-1.9.3-p392@global/gems/bundler-1.2.4/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
/usr/local/rvm/gems/ruby-1.9.3-p392@global/gems/bundler-1.2.4/lib/bundler/runtime.rb:66:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p392@global/gems/bundler-1.2.4/lib/bundler/runtime.rb:66:in `block in require'
/usr/local/rvm/gems/ruby-1.9.3-p392@global/gems/bundler-1.2.4/lib/bundler/runtime.rb:55:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p392@global/gems/bundler-1.2.4/lib/bundler/runtime.rb:55:in `require'
/usr/local/rvm/gems/ruby-1.9.3-p392@global/gems/bundler-1.2.4/lib/bundler.rb:128:in `require'
/Users/iansherwood/Sites/music_library/config/application.rb:7:in `<top (required)>'
/Users/iansherwood/Sites/music_library/Rakefile:5:in `<top (required)>'
(See full trace by running task with --trace)
答案 0 :(得分：2)
您是否尝试过bundle exec rake db:migrate？
另一种可能性是你没有运行我的MySQL。 检查的最简单方法是：
ps aux | grep mysql
如果它没有运行，你通过MySQL安装
homebrew（安装它的常用视频指南方式）然后你可以运行mysql.server start。
答案 1 :(得分：1)
语法应为：rake db:migrate，而不是rake: dbmigrate或rake db migrate。
答案 2 :(得分：1)
答案 3 :(得分：0)
你在Gemfile中包含“gem'mysql2'”吗？