嗨，我有我的模型和它的序列化器，我在测试时发现，无论我在我的选择字段中有什么，序列化器都会被保存，但在Django管理员选择字段中，当数据错误时为空，当数据正确时，我可以看到正确的选项
所以，

-> wrong choice data
-> saved regardless 
-> nothing in django admin

-> correct choice data
-> saved
-> correct value in django admin

如果我检测到用户发布了不正确的数据，我如何返回验证错误？
我尝试的是

topic = serializers.ChoiceField(choices=School.topic)

我不认为遍历每个元组并搜索字符串是正确或有效的
代码

class SchoolViewSet(viewsets.ModelViewSet):

    queryset = School.objects.all()
    serializer_class = SchoolSerializer

    def create(self, request):
        serializer = SchoolSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        else:
            return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

class School(models.Model):

    SUBJECT = (
       ('Math', 'Mathematic'),
       ('Eng', 'English'),
       ('Cesolved', 'Chemistry'),
   )

    name = models.CharField(blank=False, max_length=50)
    subject = models.CharField(choices=SUBJECT, max_length=15, blank=False)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

    def __str__(self):
        return str(f'{self.name} is {self.subject}')

class SchoolSerializer(serializers.ModelSerializer):
    subject = serializers.ChoiceField(choices=School.SUBJECT)

    def validate(self, data):
        name = data["name"]
        if (5 > len(name)):
            raise serializers.ValidationError({"IError": "Invalid name"})
 
        return data

    class Meta:
        model = School
        fields = "__all__"