Check to see that the value of ``qfield`` is one of ``values``

            :param qfield: Instances of :class:`ommongo.query_expression.QueryExpression`
            :param values: Values should be python values which ``qfield`` \
                understands

def in_(self, qfield, *values):
        ''' Check to see that the value of ``qfield`` is one of ``values``

            :param qfield: Instances of :class:`ommongo.query_expression.QueryExpression`
            :param values: Values should be python values which ``qfield`` \
                understands
        '''
        # TODO: make sure that this field represents a list
        qfield = resolve_name(self.type, qfield)
        self.filter(QueryExpression({ qfield : { '$in' : [qfield.wrap_value(value) for value in values]}}))
        return self