Required files
mongoid/persistence/atomic/operation
mongoid/persistence/atomic/add_to_set
mongoid/persistence/atomic/bit
mongoid/persistence/atomic/inc
mongoid/persistence/atomic/pop
mongoid/persistence/atomic/pull
mongoid/persistence/atomic/pull_all
mongoid/persistence/atomic/push
mongoid/persistence/atomic/push_all
mongoid/persistence/atomic/rename
mongoid/persistence/atomic/sets
mongoid/persistence/atomic/unset