Django Rest Framework如何根据ID保存带有相关字段的模型

Question

我对 DRF 有点陌生。我有看起来像这样的记录模型:

class Records(models.Model):
    owner = models.ForeignKey(User, null=True)
    activity = models.ForeignKey(Activity, null=True)
    time_start = models.DateTimeField(null=True)
    time_end = models.DateTimeField(null=True)

  ...

RecordSerializer 是这样的:

class RecordSerializer(serializers.ModelSerializer):

    now = datetime.today()
    owner = serializers.Field(source='owner.username')
    time_start = serializers.DateTimeField(source='now')

    class Meta:
        model = Records
        fields = ("owner", "activity", "time_start")

这是观点:

class StartApiView(generics.CreateAPIView):
    model = Records
    serializer_class = RecordSerializer

    def pre_save(self, obj):
        obj.owner = self.request.user

POST 请求是从 Backbone 发送的，它包含一个带有事件 ID 的字段，例如“{activity:12}”。如果想让view保存Record，将activity设置为id为12的Activity怎么办？

Answer 1

Django REST 框架 provides a PrimaryKeyRelatedField 对于这个用例。

class RecordSerializer(serializers.ModelSerializer):
    activity = serializers.PrimaryKeyRelatedField()
    owner = serializers.CharField(read_only=True, source='owner.username')
    time_start = serializers.DateTimeField(source='now')

    class Meta:
        model = Records
        fields = ("owner", "activity", "time_start")

这将产生与您正在寻找的类似的输出，并且它将接受 id想要更新它时的事件。