英文:
How to properly patch with ModelSerializer?
问题
- 如何根据 Hero_id 更新数据库中的特定行？
- 我该如何传递请求数据？我总是收到错误消息 'WSGIRequest' object has no attribute 'data'。
- 在我的情况下，
JSONParser().parse(io.BytesIO(request.body))和request.data之间有什么区别？
以下是你要求的翻译内容：
- 如何根据 Hero_id 更新数据库中的特定行？
- 我该如何传递请求数据？我总是收到错误消息 'WSGIRequest' object has no attribute 'data'。
- 在我的情况下，
JSONParser().parse(io.BytesIO(request.body))和request.data之间有什么区别？
英文:
I'm trying to .save() my data in database. But I get an error {'Hero_id':[ErrorDetail<string='Hero with this Hero_id already exists.',='unique'>]}.
Models.py:
class Hero(models.Model):
Hero_id = models.IntegerField(auto_created=True, primary_key=True, serialize=False, verbose_name='Hero_id')
race = models.CharField(max_length=50, blank=True)
age = models.IntegerField(blank=True)
class_= models.CharField(max_length=50, blank=True)
Views.py:
class HeroSerializer(serializers.ModelSerializer):
class Meta:
model = Hero
fields = ['Hero_id', 'race', 'age', 'class_']
extra_kwargs = {
'race': {
'required': False,
'allow_null':True
},
'age': {
'required': False,
'allow_null':True
},
'class_': {
'required': False,
'allow_null':True
}
}
def PATCH(request):
if request.method == "PATCH":
stream = io.BytesIO(request.body)
data = JSONParser().parse(stream)
serializer = HeroSerializer(data=data["json"],partial=True)
if serializer.is_valid():
serializer.save()
return JsonResponse(data,save=False)
return JsonResponse(serializer.errors)
My incoming data is always containing Hero_id.
Example: {"json":{"Hero_id":"4", "race":"orc"}} or {"json":{"Hero_id":"4", "race":"Human", "age":"34", "class_":"archer"}}
Questions:
1)How to patch specific row in database depending on Hero_id?
2)How can I pass a request.data? I always get an error 'WSGIRequest' object has no attribute 'data'.
3)Is there any difference between JSONParser().parse(io.BytesIO(request.body)) and request.data in my case?
答案1
得分: 2
你需要将更新的实例传递给序列化器。如果没有它，Django 将尝试创建新对象：
@api_view
def PATCH(request):
instance = Hero.objects.get(Hero_id=request.data["json"]["Hero_id"])
serializer = HeroSerializer(instance, data=data["json"], partial=True)
if serializer.is_valid():
serializer.save()
return JsonResponse(data)
return JsonResponse(serializer.errors)
顺便说一下，你可以使用 api_view 装饰器来启用 Django REST 框架的请求处理。在这种情况下，你不需要手动解析请求体。
英文:
You need to pass updating instance to serializer. Without it, djnago will try to create new object:
@api_view
def PATCH(request):
instance = Hero.objects.get(Hero_id=request.data["json"]["Hero_id"])
serializer = HeroSerializer(instance, data=data["json"], partial=True)
if serializer.is_valid():
serializer.save()
return JsonResponse(data)
return JsonResponse(serializer.errors)
BTW you can use api_view decorator to enable Django rest framework request. In this case you don't need to parse request body manually.
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