[英]Custom writable field in ModelSerializer
I'd like to add a custom field to a serializer that's used when creating resources.我想在创建资源时使用的序列化程序中添加一个自定义字段。 It's not a model field.这不是一个模型领域。
I tried the following:我尝试了以下方法:
class CampaignSerializer(ModelSerializer):
class Meta:
model = Campaign
fields = ("groups",)
write_only_fields = ("groups",)
groups = ListField(IntegerField(), min_length=1)
def validate(self, data):
# ...
return data
However groups
doesn't exist in data
in the validate()
function.但是validate()
函数中的data
中不存在groups
。 I found out that DRF sets read_only=True
for the field, which is definitely not what I want.我发现 DRF 为该字段设置了read_only=True
,这绝对不是我想要的。
Is there a way to specify a writable field, or do I have to resort to the view set's perform_create()
method?有没有办法指定一个可写字段,还是我必须求助于视图集的perform_create()
方法?
The following will work, but is likely not the intended way of doing it:以下方法可行,但可能不是预期的方式:
from rest_framework import serializers
class MySerializer(serializers.ModelSerializer):
class Meta:
model = MyModel
fields = ('foo', ) # also add your normal model fields
foo = serializers.SerializerMethodField()
def get_foo(self, obj):
return ... # do necessary reading stuff
def create(self, validated_data):
# use self.initial_data to access the raw input data sent in POST request
self.initial_data['foo']
... # do necessary validations of 'foo'
instance = super().create(validated_data)
... # do necessary write stuff
return instance
# Do likewise with .update method
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