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undefined method visitor
We're using the mysql2 gem and we noticed this error when we arel updated to 2.1.5. We went back to 2.1.4 and everything went back to normal.
undefined method `visitor' for #ActiveRecord::ConnectionAdapters::Mysql2Adapter:0x00000103dea3d8
http://stackoverflow.com/questions/7001479/undefined-method-visitor-for-rails-3-dbmigrate/7010671#7010671