How to override model field validation in django rest framework ModelSerializer

remove unique constraint on mobile number of table,so django serializer will validate according to that .

or alternatively,

   serializer=UserProfileSerializer(data=request.DATA,partial=True)

I understand you won't save the serializer data. So, you can set mobileNumber as a read_only field on UserProfileSerializer.

Check serializer fields documentation for more info: http://www.django-rest-framework.org/api-guide/fields/#core-arguments

By overriding the model field within the serializer, and specifying required=False, allow_blank=True, allow_null=True:

class SomeModel(models.Model):   some_model_field_which_is_required = models.ForeignKey(...)   some_other_required_field = models.CharField(...)class SomeModelSerializer(serializers.ModelSerializer):    some_model_field_which_is_required = SomeNestedSerializer(        many=True, required=False, allow_blank=True    )    some_other_required_field = serializers.CharField(required=False, allow_blank=True)   def validate(self, *args, **kwargs):       print('should get here')   def validate_some_other_required_field(self, *args, **kwargs):       print('should also get here')    class Meta:        model = SomeModel