aq1018/mongoid-history — pull request #35 by dblock (2012-06-12 16:35:49+00:00)
Title: Fix: sweeper references record of change, not the record changed.

The sweeper is referencing the wrong class to figure out whether a modifier has already been assigned. This is easily reproduced by renaming the modifier field - without the change the code examines the tracker which has a modifier field which is always nil.

@aq108, please take a look in case i got something wrong here ;)