thinkwell/mongoid_nested_set — pull request #6 by asavartsov (2012-05-10 20:08:51+00:00)
Title: Order option on association and Mongoid 3

As far as mongoid 3 using Origin DSL, only this sorting options could be used: https://github.com/mongoid/origin/blob/master/lib/origin/optional.rb#L134

So, changed `:order` option for `children`, otherwise `children` will fail on new mongoid.