boolwan field filter

hello ..
i am having a database of college which have a name city state
branches etc...
so
class College(models.Model):
name = models.CharField(max_length=250)
city = models.ForeignKey(City)
branch1 = models.BooleanField(default=False, blank=True)
branch2 = models.BooleanField(default=False, blank=True)
branch3 = models.BooleanField(default=False, blank=True)
branch4 = models.BooleanField(default=False, blank=True)
now i want to provide user that they can search colleges from
branches..
so i am giving them a select box where they can select the city and
branches
suppose i get two queries c and b
so i will filter all the colleges having city = c and
Branches=b
so please tell me how to filter
i have filtered city but how to add one another filter for branch {as
it is bolleanfield}
college_list = College.objects.filter(city__title__icontains=Qcity)

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