mirrors/django
1
0
Fork 0
mirror of https://github.com/django/django.git synced 2025-10-27 15:46:10 +00:00
Code Issues 32 Releases Wiki Activity

MERGED MAGIC-REMOVAL BRANCH TO TRUNK. This change is highly backwards-incompatible. Please read http://code.djangoproject.com/wiki/RemovingTheMagic for upgrade instructions.

Browse Source 
git-svn-id: http://code.djangoproject.com/svn/django/trunk@2809 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty
2006-05-02 01:31:56 +00:00
parent d5dbeaa9be
commit f69cf70ed8
366 changed files with 17833 additions and 11199 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
django/core/paginator.py
View File

@@ -6,20 +6,17 @@ class InvalidPage(Exception):
class ObjectPaginator:
"""
This class makes pagination easy. Feed it a module (an object with
get_count() and get_list() methods) and a dictionary of arguments
to be passed to those methods, plus the number of objects you want
on each page. Then read the hits and pages properties to see how
many pages it involves. Call get_page with a page number (starting
This class makes pagination easy. Feed it a QuerySet, plus the number of
objects you want on each page. Then read the hits and pages properties to
see how many pages it involves. Call get_page with a page number (starting
at 0) to get back a list of objects for that page.
Finally, check if a page number has a next/prev page using
has_next_page(page_number) and has_previous_page(page_number).
"""
def __init__(self, module, args, num_per_page, count_method='get_count', list_method='get_list'):
self.module, self.args = module, args
def __init__(self, query_set, num_per_page):
self.query_set = query_set
self.num_per_page = num_per_page
self.count_method, self.list_method = count_method, list_method
self._hits, self._pages = None, None
self._has_next = {} # Caches page_number -> has_next_boolean
@@ -30,14 +27,17 @@ class ObjectPaginator:
raise InvalidPage
if page_number < 0:
raise InvalidPage
args = copy(self.args)
args['offset'] = page_number * self.num_per_page
# Retrieve one extra record, and check for the existence of that extra
# record to determine whether there's a next page.
args['limit'] = self.num_per_page + 1
object_list = getattr(self.module, self.list_method)(**args)
limit = self.num_per_page + 1
offset = page_number * self.num_per_page
object_list = list(self.query_set[offset:offset+limit])
if not object_list:
raise InvalidPage
self._has_next[page_number] = (len(object_list) > self.num_per_page)
return object_list[:self.num_per_page]
@@ -45,11 +45,8 @@ class ObjectPaginator:
"Does page $page_number have a 'next' page?"
if not self._has_next.has_key(page_number):
if self._pages is None:
args = copy(self.args)
args['offset'] = (page_number + 1) * self.num_per_page
args['limit'] = 1
object_list = getattr(self.module, self.list_method)(**args)
self._has_next[page_number] = (object_list != [])
offset = (page_number + 1) * self.num_per_page
self._has_next[page_number] = len(self.query_set[offset:offset+1]) > 0
else:
self._has_next[page_number] = page_number < (self.pages - 1)
return self._has_next[page_number]
@@ -59,12 +56,7 @@ class ObjectPaginator:
def _get_hits(self):
if self._hits is None:
order_args = copy(self.args)
if order_args.has_key('order_by'):
del order_args['order_by']
if order_args.has_key('select_related'):
del order_args['select_related']
self._hits = getattr(self.module, self.count_method)(**order_args)
self._hits = self.query_set.count()
return self._hits
def _get_pages(self):