def save_transaction(self, serializer):
t = Transaction()
t.origin = serializer.validated_data["origin"]
t.destination = serializer.validated_data["destination"]
t.ammount = serializer.validated_data["ammount"]
t.coin_type = serializer.validated_data["coin_type"]
if t.origin.balance - t.ammount < 0:
raise Exception("El origen no tenia fondos")
t.origin.balance = t.origin.balance - t.ammount
t.destination.balance = t.destination.balance + t.ammount
t.origin.save()
t.destination.save()
serializer.save()
