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Django provides a framework for paginating a list of objects in a few lines
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of code. This is often useful for dividing search results or long lists of
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objects into easily readable pages.
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from django.db import models
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class Article(models.Model):
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headline = models.CharField(max_length=100, default='Default headline')
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pub_date = models.DateTimeField()
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def __unicode__(self):
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__test__ = {'API_TESTS':"""
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# Prepare a list of objects for pagination.
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>>> from datetime import datetime
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>>> for x in range(1, 10):
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... a = Article(headline='Article %s' % x, pub_date=datetime(2005, 7, 29))
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>>> from django.core.paginator import Paginator
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>>> paginator = Paginator(Article.objects.all(), 5)
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>>> paginator.num_pages
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>>> paginator.page_range
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>>> p = paginator.page(1)
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[<Article: Article 1>, <Article: Article 2>, <Article: Article 3>, <Article: Article 4>, <Article: Article 5>]
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>>> p.has_other_pages()
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>>> p.next_page_number()
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>>> p.previous_page_number()
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# Get the second page.
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>>> p = paginator.page(2)
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[<Article: Article 6>, <Article: Article 7>, <Article: Article 8>, <Article: Article 9>]
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>>> p.has_other_pages()
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>>> p.next_page_number()
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>>> p.previous_page_number()
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# Empty pages raise EmptyPage.
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Traceback (most recent call last):
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Traceback (most recent call last):
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# Empty paginators with allow_empty_first_page=True.
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>>> paginator = Paginator(Article.objects.filter(id=0), 5, allow_empty_first_page=True)
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>>> paginator.num_pages
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>>> paginator.page_range
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# Empty paginators with allow_empty_first_page=False.
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>>> paginator = Paginator(Article.objects.filter(id=0), 5, allow_empty_first_page=False)
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>>> paginator.num_pages
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>>> paginator.page_range
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# Paginators work with regular lists/tuples, too -- not just with QuerySets.
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>>> paginator = Paginator([1, 2, 3, 4, 5, 6, 7, 8, 9], 5)
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>>> paginator.num_pages
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>>> paginator.page_range
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# Get the first page.
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>>> p = paginator.page(1)
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>>> p.has_other_pages()
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>>> p.next_page_number()
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>>> p.previous_page_number()
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# Paginator can be passed other objects with a count() method.
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>>> class CountContainer:
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>>> paginator = Paginator(CountContainer(), 10)
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>>> paginator.num_pages
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>>> paginator.page_range
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# Paginator can be passed other objects that implement __len__.
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>>> class LenContainer:
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... def __len__(self):
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>>> paginator = Paginator(LenContainer(), 10)
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>>> paginator.num_pages
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>>> paginator.page_range
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# Add a few more records to test out the orphans feature.
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>>> for x in range(10, 13):
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... Article(headline="Article %s" % x, pub_date=datetime(2006, 10, 6)).save()
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# With orphans set to 3 and 10 items per page, we should get all 12 items on a single page.
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>>> paginator = Paginator(Article.objects.all(), 10, orphans=3)
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>>> paginator.num_pages
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# With orphans only set to 1, we should get two pages.
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>>> paginator = Paginator(Article.objects.all(), 10, orphans=1)
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>>> paginator.num_pages