如何在Django中过滤并使用类的方法作为条件？

from django.db import models

class MyModel(models.Model):
    name = models.CharField(max_length=100)
    age = models.IntegerField()

    def is_adult(self):
        return self.age >= 18

from django.db.models import F

adults = MyModel.objects.filter(is_adult=True)

from django.db.models import BooleanField, Case, When

adults = MyModel.objects.annotate(
    is_adult=Case(
        When(age__gte=18, then=True),
        default=False,
        output_field=BooleanField()
    )
).filter(is_adult=True)