Getting "AttributeError: 'QuerySet' object has no attribute '_meta'" on django rest "PUT" method - django-rest-framework

Question

I am trying to update the record with PUT method, Getting AttributeError: 'QuerySet' object has no attribute '_meta'.
My models.py:
class TableInfo(models.Model):
table_name = models.CharField(max_length=10)
columns = JSONField(null=False)
serializer.py:
class TableInfoSerializer(serializers.ModelSerializer):
class Meta:
model = TableInfo
fields = '__all__'
views.py :
#api_view(['GET','PUT'])
def table_info(request):
try:
queryset = TableInfo.objects.all()
print("1")
except TableInfo.DoesNotExist:
return Response(status=status.HTTP_404_NOT_FOUND)
if request.method == 'GET':
print("2")
serializer_class = TableInfoSerializer(queryset, many=True)
return Response(serializer_class.data)
elif request.method == 'PUT':
print(request.data)
serializer = TableInfoSerializer(queryset, data=request.data)
if serializer.is_valid():
serializer.save()
print("4")
return HttpResponse(serializer.data)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
code is breaking at if serializer.is_valid():
On "GET" I am getting the result. Please help me with "PUT" method.

Answer 1

This error happens with PUT because the serializer tries to access the Meta class on the model instance it is updating, but fails because you are not passing a model instance - you're passing a queryset as indicated in the comments.
So you need to pass an instance, and to specify which instance you would normally pass the instance id via the URL. For that you would be best to separate out your views, and create a table_detail view for retrieving and updating a specific instance.
#api_view(['GET','PUT'])
def table_detail(request, pk):
try:
table_info = TableInfo.objects.get(pk=pk) # Lookup a specific object
except TableInfo.DoesNotExist:
return Response(status=status.HTTP_404_NOT_FOUND)
if request.method == 'GET':
serializer_class = TableInfoSerializer(table_info)
return Response(serializer_class.data)
elif request.method == 'PUT':
serializer = TableInfoSerializer(table_info, data=request.data)
if serializer.is_valid():
serializer.save()
return Response(serializer.data)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
Your table_info view can then just handle the list operation.
#api_view(['GET'])
def table_info(request):
if request.method == 'GET':
queryset = TableInfo.objects.all()
serializer_class = TableInfoSerializer(queryset, many=True)
return Response(serializer_class.data)