如何在使用序列化和 modelViewSet 创建另一个模型的对象后创建一个模型的对象

Question

这些是模型：

class Event (models.Model):
    status = models.CharField(max_length = 30, blank = True)
    time = models.DateTimeField()
    point = models.ForeignKey(Point)
    person = models.ForeignKey(Person)
    device = models.ForeignKey(Device)
    organization = models.ForeignKey(Organization)

class Presence(models.Model):
    point = models.ForeignKey(Point)
    person = models.ForeignKey(Person)
    date_from = models.DateTimeField()
    date_to = models.DateTimeField()

这是序列化器：

class EventSerializer(serializers.ModelSerializer):
    person = serializers.SlugRelatedField(queryset=Person.objects.all(), slug_field='card_tag')
class Meta:
    model = Event
    fields = ['id','time','point','person','device','organization']

这是API:

class EventAPI(viewsets.ModelViewSet):
     serializer_class = cs.EventSerializer

这是URL:

url(r'^event/', api.EventAPI.as_view({'post':'create'}), name='event_create'),

所以我想要这些：

after every creation of Event object, check it by %2 (getting number of objects by card_tag, which is in body of request), if it's number of events %2 == 0 => create object of Presence, how can I do it ?

谢谢和抱歉

Answer 1

您应该可以使用 perform_create 方法，默认情况下类似于：

def perform_create(self, serializer):
    serializer.save()

现在您可以覆盖它并执行几乎任何您想做的事情。

def perform_create(self, serializer):
    serializer.save()
    if ..something.. % 2:
        Presence.objects.create(...)

如何在使用序列化和 modelViewSet 创建另一个模型的对象后创建一个模型的对象

How to create object of one Model after creating another Model's object using serialization and modelViewSet

serialization

model

model-view

django-rest-framework