dazuma/activerecord-mysql2spatial-adapter — pull request #4 by janv (2012-05-08 11:29:42+00:00)
Title: Fix for ActiveRecord >= 3.2.2

In https://github.com/rails/rails/commit/83e42d52e37a33682fcac856330fd5d06e5a529c the interface to vistor.accept has changed. ActiveRecord-Mysql2Spatial-Adapter breaks this. Here's a fix