Django:不能更新模型中的外键值

Question

当我创建这个模型

class TestRequest(models.Model):
class Meta:
verbose_name_plural = "TestRequest"
title = models.CharField(max_length=256, null=True, blank=True)
testConfiguration = models.ForeignKey(
TestConfiguration, on_delete=models.PROTECT, null=True, blank=True)
testDescription = models.ForeignKey(
TestDescription, on_delete=models.PROTECT, null=True, blank=True)

序列化器:

class TestRequestSerializer(serializers.ModelSerializer):
class Meta:
model = TestRequest
fields = [
'id',
'title',
'testConfiguration',
'testDescription',
]
depth = 2

视图:

@api_view(['PUT'])
def TestRequestUpdate(request, pk):
testRequest = TestRequest.objects.get(id=pk)
serializer = TestRequestSerializer(instance=testRequest, data=request.data)
if serializer.is_valid():
serializer.save()
return Response(serializer.data, status=status.HTTP_201_CREATED)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

当我想稍后从前端用更新它们时，这个状态:

id: 98
title: "title"
testConfiguration: 31
testDescription: 32

我得到这个响应:

{
"id": 98,
"title": "title",
"testConfiguration": null,
"testDescription": null
}

为什么我不能更新它?

编辑:我把我的解决方案作为答案。

Answer 1

你可以用下面的代码修改你的视图:

testRequest = TestRequest.objects.get(id=pk)
import json
data = json.loads(json.dumps(request.data))
if data.get('testConfiguration', None) is None and testRequest.testConfiguration:
data.update({'testConfiguration': testRequest.testConfiguration.id})
if data.get('testDescription', None) is None and testRequest.testDescription:
data.update({'testDescription': testRequest.testDescription.id})
serializer = TestRequestSerializer(instance=testRequest, data=data)

Answer 2

我的解决方案是从POST请求的序列化器中删除深度值，并为GET请求添加一个单独的序列化器。