[Rails] tests fail after activerecord rename_column

I've renamed a column in an activerecord table by migrating. I
searched and changed all references from <old column name> to <new
column name> in source / tests.

However, a lot of my tests now fail with errors of the type :
SQLException ... table has no column named <old column name>.

I also did a grep and can't find any references to <old column name>
in the project directory.

Which files could be using the <old column name> ? Are there some
binary files that I need to clear ? I'm using Rails 3.

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