A problem about get_absolute_url()

Hi all,

I have 4 classes and i want to build a get_absolute_url() for a class,
querying other 3 classes. But i get "list index out of range" error
for the FILTER row. Any ideas?

class Aaa( models.Model ):
...
...

class City( models.Model ):
...
...

class Bbb( models.Model ):
aaa = models.ForeignKey( Aaa )
city = models.ForeignKey( City )
...
...

class Ccc( models.Model ):
aaa = models.ForeignKey( Aaa )
...
...

def get_absolute_url(self):

bbbs = Bbb.objects.filter( aaa = self.aaa )

city = City.objects.get( id = bbbs[0].city.id )

return "/" + city.name + "/" + str(self.id)

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