AttributeError: 'Serializer' object has no attribute '_meta' - django

Question

i have created this serializer to validate on the presence of a record with these column combination`
class CampaignServicesValidation(serializers.Serializer):
campaign_id = serializers.IntegerField(required=True)
service_id = serializers.IntegerField(required=True)
def validate(self, data):
try:
campaign_service = CampaignServices.objects.get(campaign_id=data['campaign_id'],
service_id=data['service_id'])
print("found"+str(campaign_service.id))
except Exception:
raise serializers.ValidationError(detail='Campaign Service does not exist')
return campaign_service
and it is called in my viewSet like this:
campaign_service = CampaignServicesValidation(data={'campaign_id': request.data['campaign_id'], 'service_id': pk})
if not campaign_service.is_valid():
return RestResponse(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, serializer_error=campaign_service.errors)
when the combination is not found it raises an exception and works well, but when it passes validation and enters the is_valid() function in the if condition it produces this error
Traceback (most recent call last):
File "D:\RightsHero\collector-management\venv\lib\site-packages\django\core\handlers\exception.py", line 55, in inner
response = get_response(request)
File "D:\RightsHero\collector-management\venv\lib\site-packages\django\core\handlers\base.py", line 197, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "D:\RightsHero\collector-management\venv\lib\site-packages\django\views\decorators\csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "D:\RightsHero\collector-management\venv\lib\site-packages\rest_framework\viewsets.py", line 125, in view
return self.dispatch(request, *args, **kwargs)
File "D:\RightsHero\collector-management\venv\lib\site-packages\rest_framework\views.py", line 509, in dispatch
response = self.handle_exception(exc)
File "D:\RightsHero\collector-management\venv\lib\site-packages\rest_framework\views.py", line 469, in handle_exception
self.raise_uncaught_exception(exc)
File "D:\RightsHero\collector-management\venv\lib\site-packages\rest_framework\views.py", line 480, in raise_uncaught_exception
raise exc
File "D:\RightsHero\collector-management\venv\lib\site-packages\rest_framework\views.py", line 506, in dispatch
response = handler(request, *args, **kwargs)
File "D:\RightsHero\collector-management\collectors_management\views.py", line 157, in update_campaign_service_frequency
serializer.save()
File "D:\RightsHero\collector-management\venv\lib\site-packages\rest_framework\serializers.py", line 207, in save
self.instance = self.update(self.instance, validated_data)
File "D:\RightsHero\collector-management\venv\lib\site-packages\rest_framework\serializers.py", line 993, in update
info = model_meta.get_field_info(instance)
File "D:\RightsHero\collector-management\venv\lib\site-packages\rest_framework\utils\model_meta.py", line 35, in get_field_info
opts = model._meta.concrete_model._meta
AttributeError: 'CampaignServicesValidation' object has no attribute '_meta'
I have tried changing serializer.Serializer to ModelSerialzier but nothing changed

Answer 1

Since Serializer does not have a _meta attribute, it does not have the is_valid() method. Instead, you should check the serializer.errors attribute of the serializer after calling validate().