以下是投票网站项目的一个片段,我正在尝试在投票后获得下一个类别。。。你知道吗
当用户成功投票后,我希望页面重定向到下一个类别。。。我所做的是获取该类别的id,然后将一个变量保存为next\u category,使原始类别的id增加1(next\u category=类别id+ 1). 你知道吗
但正如你所知道的,Django并没有严格地按顺序生成id,所以如果我之前删除了一个类别,比如说cat5,我将cat1 cat2考虑到cat10,当它到达cat4时,它会有问题
提名者视图提供特定类别的页面,投票视图是表单处理视图。 希望它足够解释。你知道吗
@login_required
def Nominees(request, category_id):
categories = Category.objects.get(id=category_id)
next_category = categories.id +1
college_id = categories.College.id
if lastday < today:
messages.info(request, "Window closed")
context = {'categories':categories, 'college_id':college_id, 'lastday':lastday, 'today':today,'next_category':next_category}
return render(request, 'nomination/contestants.html', context )
def Voting(request):
if request.method == "POST":
vote_user = request.POST.get('vote_user')
vote_contestant = request.POST.get('vote_contestant')
vote_category = request.POST.get('vote_category')
next_category = request.POST.get('next_cat')
vote_college = request.POST.get('vote_college')
college = College.objects.get(pk=int(vote_college))
college_id = college.id
nex = int(next_category)-1
try:
Vote.objects.filter(user_id=request.user.id, category_id=vote_category)[0]
messages.error(request, "You've already voted")
return HttpResponseRedirect(reverse('nomination:nominees', args=(vote_category,)))
except(IndexError, Vote.DoesNotExist):
if lastday < today:
messages.error(request, "Too late")
return HttpResponseRedirect(reverse('nomination:nominees', args=(vote_category,)))
else:
new_vote = Vote(contestant_id=vote_contestant, category_id=vote_category, college_id=vote_college, user_id=vote_user)
new_vote.save()
messages.success(request, "Successfully voted!!")
try:
categories = college.category_set.filter(id=next_category, College_id=college_id)[nex]
category_id=categories.id
return HttpResponseRedirect(reverse('nomination:nominees', args=(category_id,)))
except (IndexError, Category.DoesNotExist):
categories = college.category_set.first()
category_id = categories.id
return HttpResponseRedirect(reverse('nomination:categories', args=(college_id,)))
我也会很感激如果我能得到一个更好的方法来做这件事,比如也许使用下一个函数,我已经尝试,但它仍然给我的问题。你知道吗
为了防止有人还在想办法,我后来找到了另一种方法,我将queryset转换成一个列表,并使用index函数:
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