Python Django rest 框架：覆盖 ModelSerializer 中的 create() 传递额外参数
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Django rest framework: override create() in ModelSerializer passing an extra parameter
提问by floatingpurr
I am looking for a way to properly ovverride the default .create()method of a ModelSerializerserializer in Django Rest Framework for dealing with an extra parameter.
我正在寻找一种方法来正确覆盖Django Rest Framework 中序列化程序的默认.create()方法，ModelSerializer以处理额外的参数。
In my original Django model I have just overridden the default.save()method for managing an extraparam. Now .save()can be called also in this way: .save(extra = 'foo').
在我的原始 Django 模型中，我刚刚覆盖了.save()管理extra参数的默认方法。现在.save()也可以叫做以这样的方式.save(extra = 'foo')。
I have to create a ModelSerializermapping on that original Django model:
我必须ModelSerializer在原始 Django 模型上创建一个映射：
from OriginalModels.models import OriginalModel
from rest_framework import serializers
class OriginalModelSerializer(serializers.ModelSerializer):
# model fields
class Meta:
model = OriginalModel
But in this way I can't pass the extraparam to the model .save()method.
但是这样我无法将extra参数传递给模型.save()方法。
How can I properly override the .create()method of my OriginalModelSerializerclass to take (eventually) this extraparam into account?
如何正确覆盖.create()我的OriginalModelSerializer类的方法以（最终）extra考虑这个参数？
采纳答案by Alex T
Hmm. this might not be the perfect answer given I don't know how you want to pass this "extra" in (ie. is it an extra field in a form normally, etc)
唔。这可能不是完美的答案，因为我不知道您想如何将这个“额外”传入（即它是否通常是表单中的额外字段等）
What you'd probably want to do is just represent foo as a field on the serializer. Then it will be present in validated_datain create, then you can make createdo something like the following
您可能想要做的只是将 foo 表示为序列化程序上的一个字段。然后它将出现在validated_datain 中create，然后您可以create执行以下操作
def create(self, validated_data):
obj = OriginalModel.objects.create(**validated_data)
obj.save(foo=validated_data['foo'])
return obj
You'd probably want to look at the default implementation of create for some of the other things it does though (like remove many-to-many relationships, etc.).
您可能想查看 create 的默认实现，以了解它所做的其他一些事情（例如删除多对多关系等）。
回答by davmor
You can now do this in the view set (threw in user as a bonus ;) ):
您现在可以在视图集中执行此操作（作为奖励扔给用户 ;) ）：
class OriginalModelViewSet(viewsets.ModelViewSet):
"""
API endpoint that allows OriginalModel classes to be viewed or edited.
"""
serializer_class = OriginalModelSerializer
queryset = OriginalModel.objects.all()
def perform_create(self, serializer):
user = None
if self.request and hasattr(self.request, "user"):
user = self.request.user
serializer.save(user=user, foo='foo')
That way the Serializer can stay generic, i.e.:
这样 Serializer 就可以保持通用，即：
class OriginalModelSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = OriginalModel
fields = '__all__'
