Custom User Model with multiple Unique id - Django RestFramework - python-3.x

Question

Hi StackOverFlow buddies,
I have created a custom User model for my project and would like to register the Users with Restframework.
I want Custom User model to have 2 unique fields together, for which I followed "Official doc" for unique_together property. It seems to be only taking only 1 field (ie email for my case), as a unique one.
Relevant piece my code until this point looks like this:
PS: Let me know if more info is required.
models.py
class MasterUser(AbstractBaseUser):
email = models.EmailField(verbose_name='email address',max_length=255,unique=True,)
firstname = models.CharField(max_length=100,blank=True)
contact = models.CharField(max_length=100, blank=True)
objects = MyUserManager()
USERNAME_FIELD = 'email'
REQUIRED_FIELDS = ['firstname']
class Meta:
unique_together = (('email', 'contact'),)
serializer.py
class RegisterUserSerializer(serializers.ModelSerializer):
password2 = serializers.CharField(style={'input_type': 'password'}, write_only= True)
class Meta:
model = MasterUser
fields = ('firstname', 'password', 'password2', 'email','contact')
extra_kwargs = {
'password': {'write_only': True},
}
def save(self):
account = MasterUser(
email = self.validated_data['email'],
firstname = self.validated_data['firstname'],
contact = self.validated_data['contact'],
)
password = self.validated_data['password']
password2 = self.validated_data['password2']
if password != password2:
raise serializers.ValidationError({'password': 'Password doesnt matches'})
account.set_password(password)
account.save()
return account
views.py
#api_view(['POST'])
def registration_view(request):
if request.method == "POST":
serializer = RegisterUserSerializer(data= request.data)
data = {}
if serializer.is_valid():
account = serializer.save()
data['response'] = "Successfully registered new user!"
else:
data = serializer.errors
return Response(data)
Where am I missing to implement thing?

Answer 1

unique_together means the set of fields you defined should be unique for all Users. If you also want contact to be a unique field when stored in db, you should pass the unique parameter like so:
class MasterUser(AbstractBaseUser):
...
contact = models.CharField(max_length=100, blank=True, unique=True)
...