Django

Question

我正在尝试对 mysql 强制执行约束，禁止用户插入两次相同的 name 和 model。例如，不允许插入两次：name:Name1 model:Model1

#Model
class Car(models.Model):
    name = models.CharField(max_length=100)
    model = models.CharField(max_length=100)

#View
class CarListCreateAPIView(generics.ListCreateAPIView):

    serializer_class = CarSerializer
    def get_queryset(self):
        trip_code = self.kwargs.get("pk")
        return Car.objects.filter(trip = trip_code) #Return cars for given trip

#Seializer
class CarSerializer(serializers.ModelSerializer):
    class Meta:
        model = Car
        fields = ('__all__')
        constraints = [
            models.UniqueConstraint(fields=['name', 'model'], name='car_name_model_constraint')
        ]

问题是从未创建约束，因此不会强制执行。代码可能有什么问题？

Answer 1

在 class 元模型中使用 unique_together 像这样：

class Car(models.Model):
    name = models.CharField(max_length=100)
    model = models.CharField(max_length=100)
   
    class Meta:
        unique_together = ['name','model']

更多相关信息：https://docs.djangoproject.com/en/4.0/ref/models/options/#unique-together

Django - 未创建 UniqueConstraint

Django - UniqueConstraint not created

python

django-rest-framework