RuntimeError (!!! Missing the mysql2 gem. Add it to your Gemfile: gem ‘mysql2′):
在Rails3 出现这个错误，做以下工作:
1. 在Gemfile
gem 'mysql2', '~> 0.2.6'
2.
bundle update
3. 在datababse.yml
development: adapter: mysql2 encoding: utf8 database: devise # pool: 5 username: root password: reconnect: true socket: /tmp/mysql.sock
参考: http://stackoverflow.com/questions/4297253/install-mysql2-gem-on-snow-leopard-for-rails-3-with-rvm
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