django分页中,请求页号等于paginator.num_pages时报空页错误
采用django的Paginator来进行分页,当请求页号等于paginator.num_pages时报空页错误,一直弄不明白什么原因,请求大家帮助。
URL配置链接为:comm/comlist/ctype/<int:类目ID>/<int:每页数量>-<int:请求页号>
Views中的 函数如下:
def getTypeCommList(request, distinct_class, class_id,perpage_num,page_number=None):
dclass = distinct_class
if distinct_class == 'ctype':
singleCommType = CommodityType.objects.get(pk=class_id)
showCommList = Commodity.objects.filter(is_selling=True).filter(type=singleCommType )
elif distinct_class == 'cseries':
singleCommType = Series.objects.get(pk=class_id)
showCommList = Commodity.objects.filter(is_selling=True).filter(series=singleCommType)
else:
singleCommType = Level.objects.get(pk=class_id)
showCommList = Commodity.objects.filter(is_selling=True).filter(level=singleCommType)
print("当前商品总数:",showCommList.count())
print("当前获得的每页显示数",perpage_num)
print("当前页号",page_number)
showcommCount = showCommList.count()
tem_perpage_num = int(perpage_num)
if tem_perpage_num > showcommCount:
tem_perpage_num = int(showcommCount)
print("调整后的每页数量:",tem_perpage_num)
# page_num = request.GET.get('page', default='1')
page_num = 1
if page_number is not None:
page_num = int(page_number)
paginator = Paginator(showCommList, tem_perpage_num)
# 由于common中的CustomerPaginator继承了Paginator,所以这里使用CustomerPaginator实例化,传入4个参数:当前页码、每页显示页码个数、全部数据、每页显示数据条数
# paginator = CustomerPaginator(page_num,5,showCommList,tem_perpage_num)
print("当前页号",page_num)
print("paginator的num_pages值为:",paginator.num_pages)
if int(page_num) > paginator.num_pages:
page_num = paginator.num_pages
# 根据页码从分页器中取出对应页的数据
try:
pageList = paginator.page(page_num)
print(pageList.object_list)
print("当前要返回的数据集成员量:",pageList.number)
except PageNotAnInteger:
# 不是整数返回第一页数据
pageList = paginator.page(1)
# page_num = 1
except EmptyPage:
# 当参数页码大于或小于页码范围时,会触发该异常
# print('出为空页错误,EmptyPage:{}'.format(e))
print("当前请求页号超过最大页,执行到这里了")
pageList = paginator.page(paginator.num_pages)
# if int(page_num) > paginator.num_pages:
# # 大于 获取最后一页数据返回
# print("执行到这里了")
# pageList = paginator.page(paginator.num_pages)
# else:
# # 小于 获取第一页
# pageList = paginator.page(1)
# 这部分是为了再有大量数据时,仍然保证所显示的页码数量不超过10,
page_num = int(page_num)
if page_num < 6:
if paginator.num_pages <= 10:
dis_range = range(1, paginator.num_pages + 1)
else:
dis_range = range(1, 11)
elif (page_num >= 6) and (page_num <= paginator.num_pages - 5):
dis_range = range(page_num - 5, page_num + 5)
else:
dis_range = range(paginator.num_pages - 9, paginator.num_pages + 1)
context = {
'basicInfo':basicInfo,
'current_user':current_user,
'client_wish_list':client_wish_list,
'comTypeList':comTypeList,
'artTypeList':artTypeList,
'seriesList':seriesList,
'levelList':levelList,
'singleCommType':singleCommType,
'mostViewComList':mostViewComList,
'dclass':dclass,
'num_per_page':perpage_num,
'pageList': pageList,
'paginator':paginator,
'dis_range':dis_range,
}
以上代码想实现 商品分页显示,遇到的问题:
如果请求页号等于paginator.num_pages的时候,页面就会报错。报错结果如下(url为:comm/comlist/ctype/<int:类目ID>/<int:每页数量>-<int:请求页号>):
EmptyPage at /comm/comlist/ctype/2/2-2
本页结果为空
Request Method: GET
Request URL: http://127.0.0.1:8000/comm/comlist/ctype/2/2-2
Django Version: 3.1.2
Exception Type: EmptyPage
Exception Value:
本页结果为空
Exception Location: D:\Programs\Python\Python39\lib\site-packages\django\core\paginator.py, line 55, in validate_number
Python Executable: E:\MyPythonSoft\pycharmProject\BusinessOrderSystem\order_venv\Scripts\python.exe
Python Version: 3.9.0
Python Path:
['E:\MyPythonSoft\pycharmProject\BusinessOrderSystem',
'E:\MyPythonSoft\pycharmProject\BusinessOrderSystem',
'D:\Program Files\JetBrains\PyCharm '
'2020.1.1\plugins\python\helpers\pycharm_display',
'D:\Programs\Python\Python39\python39.zip',
'D:\Programs\Python\Python39\DLLs',
'D:\Programs\Python\Python39\lib',
'D:\Programs\Python\Python39',
'E:\MyPythonSoft\pycharmProject\BusinessOrderSystem\order_venv',
'E:\MyPythonSoft\pycharmProject\BusinessOrderSystem\order_venv\lib\site-packages',
'D:\Programs\Python\Python39\lib\site-packages',
'D:\Program Files\JetBrains\PyCharm '
'2020.1.1\plugins\python\helpers\pycharm_matplotlib_backend']
Server time: Wed, 04 Nov 2020 11:54:24 +0800
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