def atomic_unsets
      unsets = []
      delayed_atomic_unsets.each_pair do |name, docs|
        path = nil
        docs.each do |doc|
          path ||= doc.flag_as_destroyed
        end
        unsets.push(path || name)
      end
      unsets
    end
def atomic_unsets
      unsets = []
      delayed_atomic_unsets.each_pair do |name, docs|
        path = nil
        docs.each do |doc|
          path ||= doc.flag_as_destroyed
        end
        unsets.push(path || name)
      end
      unsets
    end
Get all the attributes that need to be unset.

 @example Get the unsets.
   person.atomic_unsets

 @return [ Array<Hash> ] The $unset operations.

 @since 2.2.0