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我试图通过在类的扩展中使用 ModelSerializer 的 create 方法来节省一些工作，然后在扩展中添加我需要的额外字段。但是，当我这样做时，我从 DRF 收到关于不支持嵌套序列化程序中的可写字段的错误。有什么方法可以实现这一点，这样我就不必在 create 方法中显式定义每个字段，而是将该工作推送到超级构造函数中？包括我的代码：

class CreateUserSerializer(ModelSerializer):
    school = SchoolSerializer(required=False) 

    class Meta:
        model = User
        fields = ('id', 'username', 'password', 'first_name', 'last_name',
              'user_type', 'school', 'email')
        extra_kwargs = {
            'password': {'write_only': True},
            'user_type': {'read_only': True}
        }

    def create(self, validated_data):
        original_validated_data = validated_data.copy()
        if 'password' in validated_data:
            password = validated_data.pop('password')

        user = super(CreateUserSerializer, self).create(validated_data)
        if 'password' in original_validated_data:
            user.set_password(original_validated_data['password'])
        if 'school' in original_validated_data:
            user.user_type = User.TYPE_ADVISOR

        return user

这是我得到的错误：

File "/serializers/user.py", line 41, in create
  user = super(CreateUserSerializer, self).create(validated_data)
File "/lib/python2.7/site-packages/rest_framework/serializers.py", line 832, in create
  raise_errors_on_nested_writes('create', self, validated_data)
File "/lib/python2.7/site-packages/rest_framework/serializers.py", line 724, in raise_errors_on_nested_writes
  class_name=serializer.__class__.__name__
AssertionError: The `.create()` method does not support writable nestedfields by default.
Write an explicit `.create()` method for serializer `api.serializers.user.CreateUserSerializer`, or set `read_only=True` on nested serializer fields.

我正在使用 Rest Framework V3.3.1

4

2 回答 2

6

我认为这不会起作用，因为调用 super 有效意味着您正在调用根据文档不支持编写嵌套模型的基本方法。

要解决此问题，请查看：

http://www.django-rest-framework.org/api-guide/relations/#writable-nested-serializers

于 2015-11-11T20:31:25.673 回答
4

create()方法默认不支持可写嵌套字段。您正试图通过调用来保存school对象。create()super

相反，您可以尝试：

def create(self, validated_data):
    original_validated_data = validated_data.copy()
    if 'school' in validated_data:
        school = validated_data.pop('school')
        schoolObj = School.objects.create(**school) #Assuming your 'school' model name is School

    if 'password' in validated_data:
        password = validated_data.pop('password')

    user = User.objects.create(school=schoolObj,**validated_data)
    if 'password' in original_validated_data:
        user.set_password(original_validated_data['password'])
    if 'school' in original_validated_data:
        user.user_type = User.TYPE_ADVISOR

    user.save() 
    return user
于 2015-11-13T08:59:00.523 回答