"""

19. OR lookups

To perform an OR lookup, or a lookup that combines ANDs and ORs, combine

``QuerySet`` objects using ``&`` and ``|`` operators.

Alternatively, use positional arguments, and pass one or more expressions of

clauses using the variable ``django.db.models.Q`` (or any object with an

``add_to_query`` method).

"""

from django.db import models

class Article(models.Model):

    headline = models.CharField(max_length=50)

    pub_date = models.DateTimeField()

    class Meta:

       ordering = ('pub_date',)

    def __unicode__(self):

        return self.headline