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Paginator

Django provides a few classes that help you manage paginated data – that is, data that’s split across several pages, with “Previous/Next” links. These classes live in django/core/paginator.py.

Paginator class

class Paginator(object_list, per_page, orphans=0, allow_empty_first_page=True)
Paginator.object_list

Required. A list, tuple, QuerySet, or other sliceable object with a count() or __len__() method. For consistent pagination, QuerySets should be ordered, e.g. with an order_by() clause or with a default ordering on the model.

Paginator.per_page

Required. The maximum number of items to include on a page, not including orphans (see the orphans optional argument below).

Paginator.orphans

Optional. Use this when you don’t want to have a last page with very few items. If the last page would normally have a number of items less than or equal to orphans, then those items will be added to the previous page (which becomes the last page) instead of leaving the items on a page by themselves. For example, with 23 items, per_page=10, and orphans=3, there will be two pages; the first page with 10 items and the second (and last) page with 13 items. orphans defaults to zero, which means pages are never combined and the last page may have one item.

Paginator.allow_empty_first_page

Optional. Whether or not the first page is allowed to be empty. If False and object_list is empty, then an EmptyPage error will be raised.

Métodos

Paginator.get_page(number)

Returns a Page object with the given 1-based index, while also handling out of range and invalid page numbers.

If the page isn’t a number, it returns the first page. If the page number is negative or greater than the number of pages, it returns the last page.

Raises an EmptyPage exception only if you specify Paginator(..., allow_empty_first_page=False) and the object_list is empty.

Paginator.page(number)

Returns a Page object with the given 1-based index. Raises InvalidPage if the given page number doesn’t exist.

Atributos

Paginator.count

The total number of objects, across all pages.

Paginator.num_pages

The total number of pages.

Paginator.page_range

A 1-based range iterator of page numbers, e.g. yielding [1, 2, 3, 4].

Page class

You usually won’t construct Page objects by hand – you’ll get them using Paginator.page().

class Page(object_list, number, paginator)

A page acts like a sequence of Page.object_list when using len() or iterating it directly.

Métodos

Page.has_next()

Returns True if there’s a next page.

Page.has_previous()

Returns True if there’s a previous page.

Page.has_other_pages()

Returns True if there’s a next or previous page.

Page.next_page_number()

Returns the next page number. Raises InvalidPage if next page doesn’t exist.

Page.previous_page_number()

Returns the previous page number. Raises InvalidPage if previous page doesn’t exist.

Page.start_index()

Returns the 1-based index of the first object on the page, relative to all of the objects in the paginator’s list. For example, when paginating a list of 5 objects with 2 objects per page, the second page’s start_index() would return 3.

Page.end_index()

Returns the 1-based index of the last object on the page, relative to all of the objects in the paginator’s list. For example, when paginating a list of 5 objects with 2 objects per page, the second page’s end_index() would return 4.

Atributos

Page.object_list

The list of objects on this page.

Page.number

The 1-based page number for this page.

Page.paginator

The associated Paginator object.

Exceções

exception InvalidPage

A base class for exceptions raised when a paginator is passed an invalid page number.

The Paginator.page() method raises an exception if the requested page is invalid (i.e. not an integer) or contains no objects. Generally, it’s enough to catch the InvalidPage exception, but if you’d like more granularity, you can catch either of the following exceptions:

exception PageNotAnInteger

Raised when page() is given a value that isn’t an integer.

exception EmptyPage

Raised when page() is given a valid value but no objects exist on that page.

Both of the exceptions are subclasses of InvalidPage, so you can handle them both with except InvalidPage.

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