Django-通过带有外键引用的序列化程序创建实例

我有一个代理和用户。我想创造 User 实例通过 UserSerializer 有一个 agency_id . 但是序列化程序 validated_data 没有 机构id 打电话之后 is_valid() .

class Agency(models.Model):
    name  = models.CharField(max_length=60)

class User(modes.Model):
    username =  models.CharField(max_length=60)
    agency   =  models.ForeignKey(Agency, blank=True, null=True)

class UserSerializer(serializers.ModelSerializer):

    class Meta:
        User = get_user_model()
        model = User

        fields = ( 'id', 'username', 'agency_id' )

        read_only_fields = ['id']

尝试通过属于Acme代理的序列化程序创建用户:

agency = Agency.objects.create(name="Acme Agency")
serializer = UserSerializer(data={ 'username':'wiley', 'agency_id': agency.id} )

serializer.is_valid() # True
serializer.validated_data.get('agency_id') # None

使用代理id通过UserManager创建用户非常好:

user = User.objects.create(username='wiley', agency_id=1)
user.agency.id # 1