django/tests/modeltests/get_earliest_or_latest/models.py

from django.db import models


class Article(models.Model):
    headline = models.CharField(max_length=100)
    pub_date = models.DateField()
    expire_date = models.DateField()

    class Meta:
        get_latest_by = 'pub_date'


class Person(models.Model):
    name = models.CharField(max_length=30)
    birthday = models.DateField()
    # Note that this model doesn't have "get_latest_by" set.