How to update fields of custom user model using Django serializer - django

Question

I am trying to update the various fields of a user model when the user wants to update it which was created earlier. I am having a custom user model and I am using django rest framework for the update api.
views.py
class UserUpdate(generics.UpdateAPIView):
"""
Update user.
"""
parser_class = (FileUploadParser,)
permission_classes = (AllowAny,)
queryset = User.objects.all()
serializer_class = UserUpdateSerializer
def update(self, request, *args, **kwargs):
instance = self.get_object()
instance.user_id = request.data.get("user_id")
instance.save()
serializer = self.get_serializer(instance, data=request.data)
serializer.is_valid(raise_exception=True)
self.perform_update(serializer)
return Response(serializer.data)
models.py
class User(models.Model):
USER_CHOICES = (
(1, u'ADMIN'),
(2, u'SALES'),
(3, u'KITCHEN'),
(4, u'EMPLOYEE'),
)
image = models.ImageField(upload_to='employees/', null = True, blank = True)
name = models.CharField(max_length=50)
user_id = models.CharField(max_length=30, primary_key = True, blank = False)
email = models.CharField(max_length=50)
password = models.CharField(max_length=100)
is_active = models.BooleanField(default=True)
user_group = models.PositiveSmallIntegerField(default=4, choices=USER_CHOICES)
firebase_token = models.CharField(max_length=150, default=None, null = True)
shop = models.ForeignKey(Shop, on_delete=models.SET_DEFAULT, default=None)
phone = PhoneField(blank=False, default=0)
serializers.py
class UserUpdateSerializer(serializers.ModelSerializer):
shop = serializers.CharField()
class Meta:
model = User
fields = ('image', 'url', 'phone', 'name', 'user_id','email', 'password', 'is_active', 'user_group', 'shop')
def update(self, instance, validated_data):
shop = validated_data.pop('shop')
user_id = validated_data.pop("user_id")
print(user_id)
shopId = Shop.objects.filter(name=shop).values('shop_id').first()
if shopId is not None:
shop_id = shopId['shop_id']
try:
if user_id is not None:
instance.name = validated_data.get('name', instance.name)
instance.image = validated_data.get('image', instance.image)
instance.email = validated_data.get('email', instance.email)
instance.phone = validated_data.get('phone', instance.phone)
instance.password = validated_data.get('password', instance.password)
instance.user_group = validated_data.get('user_group', instance.user_group)
instance.shop_id = validated_data.get('shop_id', instance.shop_id)
instance.is_active = True
instance.save()
return instance
else:
print("Test")
except Exception as e:
return e
else:
return None
This is throwing an error saying that the user already exists!
Please assist!

Answer 1

Just Change your serializer like below
class UserUpdateSerializer(serializers.ModelSerializer):
shop = serializers.CharField()
class Meta:
model = User
fields = ('image', 'url', 'phone', 'name', 'user_id','email', 'password', 'is_active', 'user_group', 'shop')
def update(self, instance, validated_data):
shop = validated_data.pop('shop')
shop_obj = Shop.objects.filter(name=shop).first()
if shop_obj:
instance.shop = shop_obj
return super().update(instance, validated_data)

Answer 2

When you are calling UserUpdate API, it will create every new User for every new user_id.
I don't know why you are updating user_id. Any new user_id will create a new User instance.
If you want to update other than user_id, you need to remove the following line.
Remove these lines from UserUpdate API View.
instance.user_id = request.data.get("user_id")
instance.save()
Remove this line from UserUpdateSerializer
instance.user_id = validated_data.get('user_id', instance.user_id)
Add lookup_field = 'user_id' to UserUpdate API view
Add user_id at url, like
path('userupdate/<str:user_id>/', UserUpdate.as_view())