code: def doesnt_have(self, relation, boolean='and', extra=None):
          
          return self.has(relation, '<', 1, boolean, extra)
docs: Add a relationship count to the query.
  
          :param relation: The relation to count
          :type relation: str
  
          :param boolean: The boolean value
          :type boolean: str
  
          :param extra: The extra query
          :type extra: Builder or callable
  
          :rtype: Builder