from sqlalchemy.orm import query
class
pagination
(object):
""" 分頁物件
"""def__init__
(self, query, page, per_page, total, items):
self.query = query
self.page = page
self.per_page = per_page
self.total = total
self.items = items
@property
defpages
(self):
if self.per_page == 0:
pages = 0
else:
pages = int(ceil(self.total / float(self.per_page)))
return pages
defprev
(self, error_out=false):
assert self.query is
notnone, 'a query object is required ' \
'for this method to work'
return self.query.paginate(self.page - 1, self.per_page, error_out)
@property
defprev_num
(self):
ifnot self.has_prev:
return
none
return self.page - 1
@property
defhas_prev
(self):
return self.page > 1
defnext
(self, error_out=false):
assert self.query is
notnone, 'a query object is required ' \
'for this method to work'
return self.query.paginate(self.page + 1, self.per_page, error_out)
@property
defhas_next
(self):
return self.page < self.pages
@property
defnext_num
(self):
ifnot self.has_next:
return
none
return self.page + 1
defiter_pages
(self, left_edge=2, left_current=2,
right_current=5, right_edge=2):
last = 0
for num in xrange(1, self.pages + 1):
if num <= left_edge or \
(num > self.page - left_current - 1
and \
num < self.page + right_current) or \
num > self.pages - right_edge:
if last + 1 != num:
yield
none
yield num
last = num
defpaginate
(self, page=none, per_page=none, error_out=true):
""" 分頁函式
:param self:
:param page:
:param per_page:
:param error_out:
:return:
"""if request:
if page is
none:
try:
page = int(request.args.get('page', 1))
except (typeerror, valueerror):
if error_out:
abort(404)
page = 1
if per_page is
none:
try:
per_page = int(request.args.get('per_page', 20))
except (typeerror, valueerror):
if error_out:
abort(404)
per_page = 20
else:
if page is
none:
page = 1
if per_page is
none:
per_page = 20
if error_out and page < 1:
abort(404)
items = self.limit(per_page).offset((page - 1) * per_page).all()
ifnot items and page != 1
and error_out:
abort(404)
if page == 1
and len(items) < per_page:
total = len(items)
else:
total = self.order_by(none).count()
return pagination(self, page, per_page, total, items)
query.paginate = paginate#在原查詢類上加上分頁方法
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