Django Rest Framework 外键序列化

Question

我有以下型号:

class Geofence(models.Model):
    id = models.IntegerField(default=0, primary_key=True)
    name = models.CharField(max_length=200, default="Geofence", blank=False)
    lat = models.DecimalField(default=0, decimal_places=6, max_digits=10, blank=False)
    long = models.DecimalField(default=0, decimal_places=6, max_digits=10, blank=False)
    radius = models.IntegerField(default=10, blank=False)

    def __str__(self):
        return "Geofence: " + str(self.name);

class Checkpoint(models.Model):
    id = models.IntegerField(default=0, primary_key=True)
    name = models.CharField(max_length=200, default="Geofence", blank=False)
    geofence = models.ForeignKey(Geofence, related_name='geofence')
    lat = models.DecimalField(default=0, decimal_places=6, max_digits=10, blank=False)
    long = models.DecimalField(default=0, decimal_places=6, max_digits=10, blank=False)
    trip_id = models.IntegerField(default=0, blank=False)
    enter_time = models.DateTimeField("Enter Time", blank=False)
    start_time = models.DateTimeField("Start Time", blank = True, null=True)
    stop_time = models.DateTimeField("Stop Time", blank= True, null = True)

及其各自的序列化程序:

class GeofenceSerializer(serializers.ModelSerializer):
    id = serializers.IntegerField(min_value=0)
    name = serializers.CharField()
    lat = serializers.DecimalField(max_digits=10, decimal_places=6, coerce_to_string=False)
    long = serializers.DecimalField(max_digits=10, decimal_places=6, coerce_to_string=False)
    radius = serializers.IntegerField(min_value=0)
    class Meta:
        model = Geofence
        fields = ('id', 'name','lat', 'long', 'radius')

    def create(self, valid_data):
        return Geofence.objects.create(**valid_data)

    def update(self, instance, valid_data):
        instance.id = valid_data.get('id', instance.id)
        instance.name = valid_data.get('name', instance.name)
        instance.name = valid_data.get('lat', instance.lat)
        instance.long = valid_data.get('long', instance.long)
        instance.radius = valid_data.get('radius', instance.radius)
        instance.save()



class CheckpointSerializer(serializers.ModelSerializer):
    lat = serializers.DecimalField(max_digits=10, decimal_places=6, coerce_to_string=False)
    long = serializers.DecimalField(max_digits=10, decimal_places=6, coerce_to_string=False)
    enter_time = serializers.DateTimeField()
    start_time =serializers.DateTimeField()
    geofence = serializers.SlugRelatedField(many=False, slug_field="id", read_only=True)
    class Meta:
        model = Checkpoint
        fields = ('trip_id', 'geofence', 'start_time', 'stop_time', 'lat', 'long', 'enter_time')

我正在从 slider 中获取日期时间并进行 ajax 调用以获取相关数据。服务器以 500 错误响应。具体来说，错误“KeyError:geofence”

这是被称为的 View :

class ResultsView(APIView):
    model = Checkpoint
    serializer_class = CheckpointSerializer
    def get(self, request, start, end):
        begin_date = parse_datetime(request.GET["start"]) 
        end_date = parse_datetime(request.GET["end"])
        ids = Checkpoint.objects.filter(start_time__range=(begin_date,end_date)).filter(stop_time__range=(begin_date,end_date)).distinct().values('trip_id', 'lat', 'long', 'enter_time')
        serializer = CheckpointSerializer(ids, many=True)
        return Response(serializer.data)

    def post(self, request, format=None):
        request.data["id"] = uuid.uuid4().int & (1<<8)-1
        serializer = CheckpointSerializer(data= request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.error)

和角度调用:

$http.get("http://127.0.0.1:8000/traffic/get/?end=" + $scope.endDateTime + "&format=json&search=Search&start=" + $scope.startDateTime)
  .then(function(response) {
     console.log("Response: " + response.data)
       $scope.data = response.data;
   });

我相信问题是序列化程序中的外键:

geofence = serializers.SlugRelatedField(many=False, slug_field="id", read_only=True)

这是在 django rest 框架中序列化外键的正确方法吗？如果没有，有人会提供一个例子吗？

Answer 1

你是这个意思吗？ Specifying nested serialization

有一个简单的例子:

class AccountSerializer(serializers.ModelSerializer):
    class Meta:
        model = Account
        depth = 1 # You need only add this sentence.

结果是这样的:

[
  {
    "id": 1,
    "priority": 10,
    "role": {
      "id": 1,
      "department": "researcher"
    }
  }
]

但是，您可以获得 ForeignKey 的所有字段。我不知道如何获取 ForeignKey 的某些字段。