using "primary" field in django model - django

Question

i have two models: Address and Phone. Inside each model, rests a "Default" boolean field. What I need it to do, is if I submit a True answer in a form, then all other records must be set to False for that user.
How do I accomplish this?
class Address (models.Model):
User = models.ForeignKey(User)
Primary = models.BooleanField(default=True)
Street = models.CharField(max_length=500)
City = models.CharField(max_length=50)
State = models.CharField(max_length=40)
Zip = models.CharField(max_length=20)
County = models.CharField(max_length=20)
Country = models.CharField(max_length=50, default="United States")
Latitude = models.FloatField(null=True, blank=True)
Longitude = models.FloatField(null=True, blank=True)
class Meta:
verbose_name_plural = "Addresses"
def __str__(self):
primary = 'PRIMARY Address for ' if self.Primary else 'Address for '
return primary + self.User.first_name + ' ' + self.User.last_name
def save(self, *args, **kwargs):
geolocator = Nominatim()
location = geolocator.geocode("{} {}, {}, {}".format(self.Street, self.State, self.Zip, self.Country))
self.Latitude = location.latitude
self.Longitude = location.longitude
super(Address, self).save(args, *kwargs)
class Phone (models.Model):
User = models.ForeignKey(User)
Primary = models.BooleanField(default=True)
Country_Code = models.CharField(max_length=5, default="001")
Area_Code = models.CharField(max_length=5, blank=True, null=True)
Number = models.CharField(max_length=20, blank=True, null=True)
def __str__(self):
return self.Country_Code + "-" + self.Area_Code + "-" + self.Number

Answer 1

You can use post_save signal or override save method. Following is a simple snippet. If you want to keep consistent, put the these queries in a transaction.
def save(self, *args, **kwargs):
geolocator = Nominatim()
location = geolocator.geocode("{} {}, {}, {}".format(self.Street, self.State, self.Zip, self.Country))
self.Latitude = location.latitude
self.Longitude = location.longitude
super(Address, self).save(args, *kwargs)
Address.objects.exclude(id=self.id).update(Primary=False)