[英]Override serializer.data in Django REST Framework
I've been trying to alter the value of a form field the Django REST Framework's admin panel and for some reason the change never takes place.我一直在尝试更改 Django REST Framework 管理面板中表单字段的值,但由于某种原因,更改从未发生。 I have the serializer below我有下面的序列化程序
class SomeView(ModelViewSet):
queryset = MyModel.objects.all()
serializer_class = MyModelSerializer
# I Want to override this and change the POST data
def perform_create(self, serializer):
user = self.request.user.id
# this was a form field where I manually entered the user ID
# I now want it to default to the logged in user
serializer.data['user'] = user
# This returns the original user that was entered into the form field
print serializer.data
I checked out serializer.data with dir()
and it's just a python dictionary so I can't figure out why I can't modify the value.我用dir()
检查了 serializer.data ,它只是一个 python 字典,所以我不知道为什么我不能修改这个值。 As a test, I tried to add extra values but that doesn't work either作为测试,我尝试添加额外的值,但这也不起作用
# this doesnt work
serializer.data['some_new_field'] = 'test'
EDIT编辑
On another note, I can copy the data and edit it另一方面,我可以复制数据并进行编辑
fake_data = serializer.data.copy()
fake_data['old_value'] = 'new value'
However, it always fails to validate但是,它总是无法验证
serializer = MyModelSerializer(data=fake_data)
serializer.is_valid() # returns false
EDIT EDIT:编辑 编辑:
Ok, so the validation error was caused by Django returning a SimpleLazyObject.好的,所以验证错误是由 Django 返回 SimpleLazyObject 引起的。 Everything works now when I perform a copy of the data, but I'm really curious as to why I can't edit serializer.data
directly without copying it.当我执行数据副本时,现在一切正常,但我真的很好奇为什么我不能直接编辑serializer.data
而不复制它。 The problem is solved now, but if anyone can provide insight on the issue just for curiosity, that would be awesome.问题现在已经解决了,但如果有人能出于好奇就对这个问题提供见解,那就太棒了。
I checked out serializer.data with dir() and it's just a python dictionary so I can't figure out why I can't modify the value.我用 dir() 检查了 serializer.data ,它只是一个 python 字典,所以我不知道为什么我不能修改这个值。
While the value returned from Serializer.data
is indeed a dictionary, Serializer.data
is not a simple instance variable.虽然从Serializer.data
返回的值确实是一个字典,但Serializer.data
不是一个简单的实例变量。
If you look at rest_framework/serializers.py
:如果您查看rest_framework/serializers.py
:
class Serializer(BaseSerializer, metaclass=SerializerMetaclass):
# [...]
@property
def data(self):
ret = super().data
return ReturnDict(ret, serializer=self)
ReturnDict
inherits from OrderedDict
, but you still get a new dictionary every time you access Serializer.data
. ReturnDict
继承自OrderedDict
,但每次访问Serializer.data
时仍然会得到一个新字典。
The real data is in _data
, however as noted by the underscore you might not want to modify that either as it is not intended to be public.真实数据在_data
,但是正如下划线所指出的,您可能不想修改它,因为它不打算公开。 The values are filled by Serializer.to_representation()
which you could override on the viewset.这些值由Serializer.to_representation()
填充,您可以在视图集上覆盖它。
As for the second part: ModelViewSet
defines get_serializer()
that is called with the request POST data to create the serializer you want to modify.至于第二部分: ModelViewSet
定义get_serializer()
被调用请求POST数据来创建你要修改的串行器。 I'd suggest try to change the input data before the serializer is created, instead.我建议尝试在创建序列化程序之前更改输入数据。
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