def contribute_to_related_class(self, cls, related):
        """
        Override ForeignKey's methods, and replace the descriptor, if set by
        the parent's methods
        """
        # Internal FK's - i.e., those with a related name ending with '+' -
        # and swapped models don't get a related descriptor.
        super(VersionedForeignKey, self).contribute_to_related_class(cls,
                                                                     related)
        accessor_name = related.get_accessor_name()
        if hasattr(cls, accessor_name):
            setattr(cls, accessor_name,
                    VersionedReverseManyToOneDescriptor(related))
Override ForeignKey's methods, and replace the descriptor, if set by
        the parent's methods