python - django filter queryset based on __str__ of model -

i have following model:

class subspecies(models.model):     species = models.foreignkey(species)     subspecies = models.charfield(max_length=100)      def __str__(self):         return self.species.species_english+" "+self.species.species+" "+self.subspecies      def __unicode__(self):         return self.species.species_english+" "+self.species.species+" "+self.subspecies 

notice foreignkey field, species used in __str__ , __unicode__ methods. had made filter query:

l = list(subspecies.objects.filter(subspecies__contains=request.get.get('term')).order_by('subspecies')[:10]) 

this want, except not quite. want filter checks if __str__ representation of object contains group of characters, instead of checking subspecies field. instead of subspecies__contains=... __str____contains=... of course doesn't work.

is possible? if how make query?

thanks!

filter generates query executed in db.

__str__ run in python interpreter. can't call db. short answer "no, can't". have filter manually, using filter built-in function, example.