[英]How to add points to an IntegerFiedl with serializer DRF
I've got serializer like this and each time i do Put on that url, i want the number_of_points increase(+=1), but now when i do it, it stays the same and doesnt change.我有这样的序列化程序,每次我穿上那个 url,我希望 number_of_points 增加(+ = 1),但现在当我这样做时,它保持不变并且不会改变。 Do you have any idea how to fix it?你知道如何解决它吗?
class Answer(models.Model):
number_of_points = models.IntegerField(default=0)
class AddPointsSerializer(serializers.ModelSerializer):
class Meta:
model = Answer
fields = ('number_of_points',)
def update(self, instance, validated_data):
instance.number_of_points += 1
return instance
class AddPointsAnswer(generics.UpdateAPIView):
queryset = Answer.objects.all()
serializer_class = AddPointsSerializer
def get_queryset(self):
return super().get_queryset().filter(
id=self.kwargs['pk']
)
path('answers/<int:pk>/addpoints', AddPointsAnswer.as_view()),
def update(self, instance, validated_data):
instance.number_of_points += 1
return instance
Add instance.save()
to this function.将instance.save()
添加到此 function。 You're updating the attribute on the model instance, but never saving it to the database.您正在更新 model 实例上的属性,但从未将其保存到数据库中。
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