Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter`

环境： linux? ruby1.9.2?? rails 3.0.5?? mysql2 0.3.2

遇到问题：Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter`

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解决方法:

gem uninstall mysql2

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gem install mysql2 -v 0.2.7

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参考：http://stackoverflow.com/questions/5840742/version-of-mysql2-0-3-2-doesnt-ship-with-the-activerecord-adapter-bundled-anym

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“The problem is because you are trying to install the lastet version of mysql2 wich is incompatible with rails 3.0.x version ”

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做ROR, 版本的问题 真让人头疼