每個字段可以添加validators。比如官方的例子：

fromdjango.core.exceptionsimportValidationError

fromdjango.utils.translationimportugettext_lazyas_

defvalidate_even(value):

ifvalue%2!=0:

raiseValidationError(

_('%(value)sisnotanevennumber'),

params={'value':value},

)

fromdjango.dbimportmodels

classMyModel(models.Model):

even_field=models.IntegerField(validators=[validate_even])