Question

我正在使用Django REST Framework来存储来自扫描程序的数据，扫描程序是在检测到新扫描时向框架发送JSON POST请求的设备。模型如下：

class Location(models.Model):
    address = models.CharField(max_length=300)
    city = models.CharField(max_length=50)
    state = models.CharField(max_length=100)
    zipcode = models.IntegerField(null=True, blank=True)
    latitude = models.FloatField(null=True, blank=True)
    longitude = models.FloatField()
    def __str__(self):
       return self.address

class Scanner(models.Model): 
    location = models.ForeignKey(Location, on_delete=models.CASCADE, null=True, blank=True,related_name='scanner')
    description = models.CharField(max_length=300, null=True, blank=True)
    def __str__(self):
        return self.location.address + ": " + self.description + " (id=" + str(self.pk) + ")"

class Scan(models.Model):
    scanner = models.ForeignKey(Scanner, on_delete=models.CASCADE, null=True, blank=True,related_name='scan')
    datetime = models.DateTimeField(null=True, blank=True, default=timezone.now())
    def __str__(self):
        if self.scanner != None: 
            return self.scanner.description + ": " + str(self.datetime)
        else: 
            return "None: " + str(self.datetime)
    class Meta:
        ordering = ('datetime',)

序列化器就是这些：

class ScanSerializer(serializers.ModelSerializer):
    class Meta:
        model = Scan
        fields = ('id', 'scanner', 'datetime')

class ScannerSerializer(serializers.ModelSerializer):
    class Meta: 
        model = Scanner 
        fields = ('id', 'location', 'description',)

class UserSerializer(serializers.ModelSerializer):
    scans = serializers.PrimaryKeyRelatedField(many=True, queryset=Scan.objects.all())
    class Meta:
        model = User
        fields = ('id', 'username', 'scans')

class LocationSerializer(serializers.ModelSerializer):
    class Meta:
        model = Location 
        fields = ('id', 'address', 'city', 'state','zipcode', 'latitude', 'longitude')

如果我使用DRF URL创建新的Scan和Scanner对象，它可以正常工作。但是，当我发送这样的JSON请求时：

data={"location": "2", "description": "Test scanner"}

无法创建新对象。我认为这个问题只是指他们的ID。但是，当我尝试在框架中创建嵌套对象并发送包含嵌套对象的JSON请求时，它会抛出一个AssertionError，表示我没有正确填充所有字段。如何格式化JSON请求以创建具有与现有对象的外键关系的对象？

Django REST框架：无法使用JSON POST请求更新外键

0 个答案: