Would like to set a CustomUser's username by using the input email, but where to do the custom assigning, in view? At the same time it receiving a file as well.

Models.py

class CustomUser(AbstractUser):avatar = models.ImageField(max_length=None, upload_to='avatar', blank=True)

Serializers.py

class CustomUserSerializer(serializers.ModelSerializer):class Meta:model = CustomUserfields = ('id', 'first_name', 'last_name', 'email', 'password', 'avatar', 'groups')

Views.py

class CustomUserViewSet(viewsets.ModelViewSet):queryset = CustomUser.objects.all()serializer_class = CustomUserSerializer

thank you in advance.

What @Anzel said would work but if you want to do it in django-rest-framework you could override the create method of your CustomUserSerializer. Like:

class CustomUserSerializer(serializers.ModelSerializer):groups = serializers.PrimaryKeyRelatedField(many=True, read_only=True)def create(self, validated_data):user = CustomUser.objects.create_user(username    =validated_data['email'], # HEREemail       =validated_data['email'],password    =validated_data['password'],first_name  =validated_data['first_name'], last_name   =validated_data['last_name'],avatar      =validated_data['avatar'],)user.groups = validated_data['groups']return userclass Meta:model = CustomUserfields = ('id', 'first_name', 'last_name', 'email', 'password', 'avatar', 'groups')