RuntimeError (!!! Missing the mysql2 gem. Add it to your Gemfile: gem ‘mysql2′):

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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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