[Python] Update datetime field in bulk save json object Python Django

i am very bad in django fw. I make simple django resp api. I want to save multiple json object to db. If one of objects is already exist in db(has the same uniq fields) i need just to update filed with datetime.

My Model Like:

class CheckPort(models.Model):
created = models.DateTimeField(auto_now_add=True)
ip = models.CharField(max_length=15, blank= False)
port = models.PositiveIntegerField(default=0)
type = models.CharField(max_length=5 ,default='tcp')

class Meta:
ordering = ['created']
unique_together = ('ip', 'port','type')


My view:

@api_view(['GET', 'POST'])
def port_list(request):
if request.method == 'GET':
offers = CheckPort.objects.all()
serializer = OfferSerializer(offers, many=True)
return Response(serializer.data)

elif request.method == 'POST':
serializer = OfferSerializer(data=request.data,many=isinstance(request.data, list))
if serializer.is_valid():
serializer.save()
return Response(serializer.data, status=status.HTTP_201_CREATED)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


So how to validate this?

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