Django管理GUI可以过滤文本字段是否为空白？

from django.core.exceptions import ValidationError
from django.db import models

class MyModel(models.Model):
    my_field = models.CharField(max_length=100)

    def clean(self):
        if not self.my_field.strip():
            raise ValidationError({'my_field': 'This field cannot be empty.'})

    def save(self, *args, **kwargs):
        self.full_clean()
        super().save(*args, **kwargs)