"""

8. get_latest_by

Models can have a ``get_latest_by`` attribute, which should be set to the name

of a ``DateField`` or ``DateTimeField``. If ``get_latest_by`` exists, the

model's manager will get a ``latest()`` method, which will return the latest

object in the database according to that field. "Latest" means "having the date

farthest into the future."

"""

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'

    def __unicode__(self):

        return self.headline

class Person(models.Model):

    name = models.CharField(max_length=30)

    birthday = models.DateField()

    # Note that this model doesn't have "get_latest_by" set.

    def __unicode__(self):

        return self.name