django/tests/modeltests/str/models.py

# -*- coding: utf-8 -*-
"""
2. Adding __str__() or __unicode__() to models

Although it's not a strict requirement, each model should have a
``_str__()`` or ``__unicode__()`` method to return a "human-readable"
representation of the object. Do this not only for your own sanity when dealing
with the interactive prompt, but also because objects' representations are used
throughout Django's automatically-generated admin.

Normally,  you should write ``__unicode__``() method, since this will work for
all field types (and Django will automatically provide an appropriate
``__str__()`` method). However, you can write a ``__str__()`` method directly,
if you prefer. You must be careful to encode the results correctly, though.
"""

from django.db import models
from django.utils.encoding import smart_str

class Article(models.Model):
    headline = models.CharField(maxlength=100)
    pub_date = models.DateTimeField()

    def __str__(self):
        # Caution: this is only safe if you are certain that headline will be
        # in ASCII.
        return self.headline

class InternationalArticle(models.Model):
    headline = models.CharField(maxlength=100)
    pub_date = models.DateTimeField()

    def __unicode__(self):
        return self.headline

__test__ = {'API_TESTS':ur"""
# Create an Article.
>>> from datetime import datetime
>>> a = Article(headline='Area man programs in Python', pub_date=datetime(2005, 7, 28))
>>> a.save()

>>> str(a)
'Area man programs in Python'

>>> a
<Article: Area man programs in Python>

>>> a1 = InternationalArticle(headline=u'Girl wins €12.500 in lottery', pub_date=datetime(2005, 7, 28))

# The default str() output will be the UTF-8 encoded output of __unicode__().
>>> str(a1)
'Girl wins \xe2\x82\xac12.500 in lottery'
"""}