Ausgabe
Wie kann ich eine Logik ausführen, bevor ich einen Datensatz in meiner generischen Ansicht speichere? Ich glaube, die eigentliche Sparlogik findet innerhalb statt super().create().
Die Anfrage darin create()sieht so aus
<QueryDict: {'csrfmiddlewaretoken': ['5WvMZnoBMCUjmlMBaacLnx6Pxt3jUDvHWHvo90ORumYrClkebcx7NJZpmWASRIyG'], 'user': ['1'], 'address': ['3E8ociqZa9mZUSwGdSmAEMAoAxBK3FNDcd']}>
Aussicht
class WalletListCreateAPIView(generics.ListCreateAPIView):
queryset = Wallet.objects.all()
serializer_class = WalletSerializer
def create(self, request, *args, **kwargs):
# Some logic here prior to saving
return super().create(request, *args, **kwargs)
Zum Beispiel möchte ich den Wert für erstellen, balanceanstatt mich auf den Wert aus der Anfrage zu verlassen
class Wallet(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
address = models.CharField(max_length=34)
balance = models.DecimalField(default=0, max_digits=16, decimal_places=8)
slug = models.SlugField(max_length=34, blank=True, null=True)
Lösung
Dies ist der Ablauf, wenn Sie Ihre Anforderungsdaten im Modell speichern. Überprüfen Sie auch die Syntax create -> perform_create -> serializer’s create back to perform create dann back to create
class WalletListCreateAPIView(generics.ListCreateAPIView):
queryset = Wallet.objects.all()
serializer_class = WalletSerializer
def create(self, request, *args, **kwargs):
serializer = self.get_serializer(data=request.data)
serializer.is_valid(raise_exception=True)
wallet = self.perform_create(serializer)
headers = self.get_success_headers(serializer.data)
return Response(
self.get_response_data(user),
status=status.HTTP_201_CREATED,
headers=headers,
)
def perform_create(self, serializer):
wallet = serializer.save(user=self.request.user) # if you want to change how you want to save from serializer to your model then you should override create method of serializer as I have shown below
wallet.balance = 30
wallet.save()
return wallet
# serializers.py
class WalletSerializer(serializers.ModelSerializer):
class Meta:
model = Wallet
fields = "__all__"
def create(self, validated_data):
# here in validated data you will receive your request data after validation If you want to discard any request value you can do here
balance = validated_data.pop("balance", None)
wallet = Wallet.objects.create(**validated_data)
return wallet
Beantwortet von – Deepak Tripathi
Antwort geprüft von – Dawn Plyler (FixError Volunteer)
