I have a problem with mongoid. I have validation on some field, called `flickr_id`. The problem is, that Mongo doesn't support transactions and sometimes, somehow, despite the fact that there is `validates :flickr_id, :uniqueness => true`, there are duplicates in a database. How can I remove them from Rails application? Because anytime I want to do something with these objects which aren't unique, I get an error that it's not valid. How can I ignore validation in such situation?