sysdate依赖日期验证程序引起的合成/冗余Django迁移

Question

I have a date field like the one below in a Django model, where I want the date to be in the future (or today, but not in the past).

foo = models.DateField('Foo', null=True,
        validators=[MinValueValidator(date.today())])

This works fine, validation happens as expected on forms, however, makemigrations creates a new migration every day it runs with that date, below is an example produced today:

field=models.DateField(null=True,
    validators=[django.core.validators.MinValueValidator(
        datetime.date(2018, 1, 26))]

How can I avoid this? Should I use a custom validator instead of MinValueValidator or add a clean method to the Form subclass instead like this ?

Answer 1

There's no way to avoid this. You've got a couple of options.

• Write a custom validator.
• Write a clean_fieldname method in your forms.
• Write a pre_save signal on the model which makes sure the value is correct.