Serializer method to set the value of an attribute doesn't work in a post request. I am using Django Rest Framework
I have a model which has an attribute "transaction_id" which is a customized ID field and it's value has to be calculated in order to be saved in the database.
I have a model:
class Transaction(models.Model):
field = models.IntegerField(default=0)
transaction_id = models.UUIDField(unique=True)
This is the seriaizer:
class TransactionSerializer(serializers.ModelSerializer):
class Meta:
model = Transaction
fields = '__all__'
read_only_fields = ['id', 'transaction_id']
def set_tn_number(self):
tn_number = "some_string/"
#I have to perform some calculation in order to get the relevant value
tn_number = tn_number + str(10)
return tn_number
Now in my post method of the view, i am performing the following:
def post(self, request):
serializer = TransactionSerializer(data=request.data)
if serializer.is_valid():
serializer.tn_number = serializer.set_tn_number()
serializer.save()
message = {'message': "Transaction Created Successfully"}
return Response(message, status=status.HTTP_201_CREATED)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
But i am still getting integrity error:
NOT NULL constraint failed: transaction_transaction.transaction_id
Can someone please help me with this?
Thank you for your time
Update validated data or pass the necessary model attributes to save method as kwargs.
def post(self, request):
serializer = TransactionSerializer(data=request.data)
if serializer.is_valid():
tn_number = serializer.set_tn_number()
serializer.save(transaction_id=tn_number)
message = {'message': "Transaction Created Successfully"}
return Response(message, status=status.HTTP_201_CREATED)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)