python - 如何使用反向正确执行 HttpResponseRedirect？

Question

当我尝试反转时，出现错误“* 之后的_reverse_with_prefix() 参数必须是一个序列，而不是整数”。我之前在 View 中对参数进行了硬编码，但正在尝试使其动态化。有什么建议吗？

查看:

def add_review(request, product_id):
    p = get_object_or_404(Product, pk=product_id)
    if request.method == 'POST':
        form = ReviewForm(request.POST)
        if form.is_valid():
            form.save()
            #HARDCODED: return HttpResponseRedirect('/products/1/reviews/')
            return HttpResponseRedirect(reverse('view_reviews', args=(p.id)))
    else:
        form = ReviewForm()
    variables = RequestContext(request, {'form': form})
    return render_to_response('reserve/templates/create_review.html', variables)        


def view_reviews(request, product_id):
    product = get_object_or_404(Product, pk=product_id)
    reviews = Review.objects.filter(product_id=product_id)
    return render_to_response('reserve/templates/view_reviews.html', {'product':product, 'reviews':reviews},
    context_instance=RequestContext(request))


urlpatterns = patterns('reserve.views',
    url(r'^clubs/$', 'index'),
    url(r'^products/(?P<product_id>\d+)/reviews/$', 'view_reviews'),
    url(r'^products/(?P<product_id>\d+)/add_review/$', 'add_review'),
    url(r'^admin/', include(admin.site.urls)),
)

Answer 1

检查reverse()里面的args=(p.id)，一定是args=(p.id,)。第一种形式被视为整数而不是序列。

引用文献 the doc和 the tutorial :

A special problem is the construction of tuples containing 0 or 1 items: the syntax has some extra quirks to accommodate these. Empty tuples are constructed by an empty pair of parentheses; a tuple with one item is constructed by following a value with a comma (it is not sufficient to enclose a single value in parentheses).

此外，使用 'reserve.views.view_reviews' 而不仅仅是 'view_reviews'，因此:

reverse('reserve.views.view_reviews', args=(p.id,))

检查 the doc of reverse