无法在 create() 方法中使用 .pop('field') 从序列化程序中删除字段 - DRF

Question

我正在使用Django rest框架。我想创建管理终结点，用户可以在其中添加具有项目权限的成员。以下是来自用户的数据。

{
  "email" : "[e-mail]",
  "first_name" : "asd",
  "last_name" : "asd",
  "projects":[{
     "project_id" : 1,
     "project_role" : 1 },
   { "project_id" : 1,
     "project_role" : 1
  }],
  "position" : "something something"
}

以下是我创建的用于验证和保存数据的序列化程序。

class ProjectPermissionSerializer(serializers.Serializer):
    """
        Serialiser to hold permissions pair of project_id and role
    """
    project_id = serializers.IntegerField(allow_null=False)
    project_role = serializers.ChoiceField(PROJECT_ROLES)
    def create(self, validated_data):
        print(validated_data)
    def update(self, instance, validated_data):
        pass

class ProjectMemberSerializer(serializers.ModelSerializer):
    """
        serializer to add new member with projects
    """
    projects = ProjectPermissionSerializer(many=True)
    email = serializers.EmailField()
    class Meta:
        model = User
        fields = ('first_name',  'last_name', 'email', 'position', 'projects')
    def create(self, validated_data):
        permission_data = validated_data.pop('projects')
        emailstatus = {"email_id": validated_data.pop('email')}
        emailobj, created = EmailStatus.objects.get_or_create(**emailstatus)
        validated_data['email'] = emailobj
        project_member = User.objects.create(**validated_data)
        return project_member

尽管如此，从validated_data弹出项目后，我还是遇到了以下错误。

AttributeError: Got AttributeError when attempting to get a value for field `projects` on serializer `ProjectMemberSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `User` instance.
Original exception text was: 'User' object has no attribute 'projects'.

Answer 1

看起来您的模型没有以字段命名的项目，在这种情况下，您需要指定字段的来源，以将序列化程序的字段与模型的字段链接起来，例如"project_set"：

 projects = ProjectPermissionSerializer(many=True, source='project_set')