django分页组件

# mypage.py

import copy

from django.core.paginator import *
from django.utils.safestring import mark_safe

class PAGE(object):
    def __init__(self):
        self.request = None
        self.querysets = None
        self.page_range = None
    def view_page(self,request,querysets):
        self.request = request
        page = request.GET.get('_page', 1)
        try:
            p = Paginator(querysets, 3)
            querysets = p.page(page)
        except PageNotAnInteger:
            querysets = p.page(1)
        except EmptyPage:
            querysets = p.page(p.num_pages)
        self.querysets = querysets

        page_range = [i for i in range(int(page) - 2, int(page) + 3) if 0 < i <= p.num_pages]

        self.page_range = page_range

        return querysets
    def html_page(self):
        request_GET = copy.deepcopy(self.request.GET)
        code = '<ul class="pagination">'
        try:
            if self.querysets.has_previous():
                request_GET['_page'] = self.querysets.previous_page_number()
                code += '<li class="long"><a href="?%s">上一页</a></li>'% request_GET.urlencode()
            for page in self.page_range:
                request_GET['_page'] = page
                if page > 0:
                    if page == self.querysets.number:
                        code += '<li class="active"><a href="?%s">%s</a></li>'%(request_GET.urlencode(),page)
                    else:
                        code += '<li><a href="?%s"class="page">%s</a></li>'%(request_GET.urlencode(),page)
            if self.querysets.has_next():
                request_GET['_page'] = self.querysets.next_page_number()
                code += '<li class="long"><a href="?%s">下一页</a></li>'% request_GET.urlencode()
        except Exception as e:
            print(e)
        code += '</ul>'
        return mark_safe(code)

ppp = PAGE()

视图函数中：

#分页

        from .mypage import ppp
        querysets = ppp.view_page(request,querysets)　　#注意：querysets变量名 和 括号内参数名一致，如左
        htm = ppp.html_page()

模版中：

{{ htm }}

 问题：有警告 UnorderedObjectListWarning，是因为传入分页组件中的对象queryset无序

　　　　解决：在模型的Meta中添加默认排序  ordering = ('-pk',)