如何处理可选的 GET 参数？

Question

我有一个 GET 请求，有时有 pk 参数，有时没有。我想有 1 个视图来处理它，但我尝试编写它没有成功。这是我拥有的：

@ajax
@login_required
def search_dist(request):
    try:
        pk = request.GET.get('pk')
    except Exception:
        dist_list = request.user.distributors.all()
        starts_with = request.GET.get('query')
        if starts_with:
            dist_list = request.user.distributors.filter(
                surname__istartswith=starts_with)
        return render(request, 'distributors/distributors_list.html', {'distributors': dist_list})
    else:
        dist_list = request.user.distributors.filter(
            distributors_of_links=get_object_or_404(Link, pk=pk))
        starts_with = request.GET.get('query')
        if starts_with:
            dist_list = request.user.distributors.filter(distributors_of_links=get_object_or_404(
                Link, pk=pk)).filter(surname__istartswith=starts_with)
        return render(request, 'distributors/distributors_list.html', {'distributors': dist_list})

我的部分模型：

class Distributor(models.Model):


class Link(models.Model):
    distributors = models.ManyToManyField(
        Distributor, blank=True, related_name='distributors_of_links')


class UserProfile(AbstractUser):
    distributors = models.ManyToManyField(
        Distributor, blank=True, related_name='distributors_of_user')

查询：search_dist?query=V 我有：

GET /distributors/search_dist   404 NOT FOUND
No Link matches the given query.

我做错了什么？

Answer 1

pk = request.GET.get('pk')

不引发异常。如果 pk 不在 GET 中，它会为您提供 None。所以你的第一个案例永远不会执行。尝试：

@ajax
@login_required
def search_dist(request):
    pk = request.GET.get('pk', None)
    if pk is None:
        dist_list = request.user.distributors.all()
        starts_with = request.GET.get('query')
        if starts_with:
            dist_list = request.user.distributors.filter(
                surname__istartswith=starts_with)
        return render(request, 'distributors/distributors_list.html', {'distributors': dist_list})
    else:
        dist_list = request.user.distributors.filter(
            distributors_of_links=get_object_or_404(Link, pk=pk))
        starts_with = request.GET.get('query')
        if starts_with:
            dist_list = request.user.distributors.filter(distributors_of_links=get_object_or_404(
                Link, pk=pk)).filter(surname__istartswith=starts_with)
        return render(request, 'distributors/distributors_list.html', {'distributors': dist_list})

如何处理可选的 GET 参数？

How to deal with optional GET argument?

python

django

django-models

django-views