如何在django和djangorestframework中提供创建API的自定义验证？

from rest_framework import serializers, validators

class CustomValidator(validators.BaseValidator):
    def __call__(self, value):
        # 在这里编写自定义验证逻辑
        if value != 'example':
            raise serializers.ValidationError('验证失败')

from rest_framework import serializers

class MySerializer(serializers.Serializer):
    my_field = serializers.CharField(validators=[CustomValidator()])

from rest_framework import viewsets

class MyViewSet(viewsets.ModelViewSet):
    serializer_class = MySerializer
    queryset = MyModel.objects.all()