如何重写Wagtail StructBlock中的验证器

from django.core.exceptions import ValidationError
from wagtail.core.blocks import StructBlock
from wagtail.core.fields import CharBlock

class CustomStructBlock(StructBlock):
    def clean(self, value):
        # 调用父类的clean()方法执行默认的验证逻辑
        value = super().clean(value)

        # 自定义验证逻辑
        name = value.get('name')
        age = value.get('age')

        if not name:
            raise ValidationError('姓名不能为空')
        if not age:
            raise ValidationError('年龄不能为空')
        if age < 18 or age > 100:
            raise ValidationError('年龄必须在18到100之间')

        return value

class MyPage(Page):
    custom_block = CustomStructBlock([
        ('name', CharBlock()),
        ('age', IntegerBlock()),
    ])