thinkwell/mongoid_nested_set — pull request #10 by shimotori (2012-06-22 16:06:27+00:00)
Title: Fix "NoMethodError: undefined method `update'" error on move_to_child_of...

This is for [Issue #9: move_to_child_of: NoMethodError: undefined method `update'](https://github.com/thinkwell/mongoid_nested_set/issues/9).

I think this code only works on Mongoid 3 and won't work on Mongoid 2.x.