Returns the last instance matching the criterion and/or
        keyword arguments.

        Examples:

            last_male_user = User.last(gender="male")

def last(cls, *criterion, **kwargs):
        """Returns the last instance matching the criterion and/or
        keyword arguments.

        Examples:

            last_male_user = User.last(gender="male")
        """
        kwargs['reverse'] = True
        return cls.first(*criterion, **kwargs)