equal
deleted
inserted
replaced
|
1 """ |
|
2 8. get_latest_by |
|
3 |
|
4 Models can have a ``get_latest_by`` attribute, which should be set to the name |
|
5 of a ``DateField`` or ``DateTimeField``. If ``get_latest_by`` exists, the |
|
6 model's manager will get a ``latest()`` method, which will return the latest |
|
7 object in the database according to that field. "Latest" means "having the date |
|
8 farthest into the future." |
|
9 """ |
|
10 |
|
11 from django.db import models |
|
12 |
|
13 class Article(models.Model): |
|
14 headline = models.CharField(max_length=100) |
|
15 pub_date = models.DateField() |
|
16 expire_date = models.DateField() |
|
17 class Meta: |
|
18 get_latest_by = 'pub_date' |
|
19 |
|
20 def __unicode__(self): |
|
21 return self.headline |
|
22 |
|
23 class Person(models.Model): |
|
24 name = models.CharField(max_length=30) |
|
25 birthday = models.DateField() |
|
26 |
|
27 # Note that this model doesn't have "get_latest_by" set. |
|
28 |
|
29 def __unicode__(self): |
|
30 return self.name |