mirror of https://github.com/django/django.git
60 lines
1.4 KiB
Python
60 lines
1.4 KiB
Python
|
"""
|
||
|
|
20. Object Pagination
|
||
|
|
|
||
|
|
Django provides a framework for paginating a list of objects in a few.
|
||
|
|
This is often useful for dividing search results or long lists of objects
|
||
|
|
in to easily readable pages.
|
||
|
|
|
||
|
|
|
||
|
|
"""
|
||
|
|
from django.db import models
|
||
|
|
|
||
|
|
class Article(models.Model):
|
||
|
|
headline = models.CharField(maxlength=100, default='Default headline')
|
||
|
|
pub_date = models.DateTimeField()
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return self.headline
|
||
|
|
|
||
|
|
API_TESTS = """
|
||
|
|
# prepare a list of objects for pagination
|
||
|
|
>>> from datetime import datetime
|
||
|
|
>>> for x in range(1, 10):
|
||
|
|
... a = Article(headline='Article %s' % x, pub_date=datetime(2005, 7, 29))
|
||
|
|
... a.save()
|
||
|
|
|
||
|
|
# create a basic paginator, 5 articles per page
|
||
|
|
>>> from django.core.paginator import ObjectPaginator, InvalidPage
|
||
|
|
>>> paginator = ObjectPaginator(Article.objects.all(), 5)
|
||
|
|
|
||
|
|
# the paginator knows how many hits and pages it contains
|
||
|
|
>>> paginator.hits
|
||
|
|
9
|
||
|
|
|
||
|
|
>>> paginator.pages
|
||
|
|
2
|
||
|
|
|
||
|
|
# get the first page (zero-based)
|
||
|
|
>>> paginator.get_page(0)
|
||
|
|
[Article 1, Article 2, Article 3, Article 4, Article 5]
|
||
|
|
|
||
|
|
# get the second page
|
||
|
|
>>> paginator.get_page(1)
|
||
|
|
[Article 6, Article 7, Article 8, Article 9]
|
||
|
|
|
||
|
|
# does the first page have a next or previous page?
|
||
|
|
>>> paginator.has_next_page(0)
|
||
|
|
True
|
||
|
|
|
||
|
|
>>> paginator.has_previous_page(0)
|
||
|
|
False
|
||
|
|
|
||
|
|
# check the second page
|
||
|
|
>>> paginator.has_next_page(1)
|
||
|
|
False
|
||
|
|
|
||
|
|
>>> paginator.has_previous_page(1)
|
||
|
|
True
|
||
|
|
|
||
|
|
"""
|