Django Q查找工作但显示＆lt;＆lt; MISSING VARIABLE＆＃34; request.GET.q＆＃34; ＆GT;＆GT;在我的查阅字段中

Question

我在所有项目中使用Q查找，但这是我遇到的第一个。首先，查找按预期工作，但刷新页面时查找字段仍显示<< MISSING VARIABLE "request.GET.q" >>。如果查找不起作用，我可能会发现问题但我在这个问题上有点难过。下面是视图和模板表单。谢谢。

查看

def product_list(request):
    queryset_list = Product.objects.prefetch_related('images').select_subclasses()
    query = request.GET.get("q")
    if query:
        queryset_list = queryset_list.filter(
            Q(name__icontains=query)
        ).distinct()

    paginator = Paginator(queryset_list, 10)
    page_request_var = "page"
    page = request.GET.get(page_request_var)
    try:
        queryset = paginator.page(page)
    except PageNotAnInteger:
        queryset = paginator.page(1)
    except EmptyPage:
        queryset = paginator.page(paginator.num_pages)

    form = forms.ProductClassForm(request.POST or None)
    if form.is_valid():
        return redirect('dashboard:product-add')

    ctx = {
        'form': form,
        "object_list": queryset,
        "title": "Products",
        "page_request_var": page_request_var,
    }
    return TemplateResponse(request, 'dashboard/product/list.html', ctx)

查找表单

<form method='GET' action=''>
  <label for="full-text">Search Product List</label>
      <input type="text" placeholder="Enter Keywords and Press Enter" class="search-input" name="q" value='{{ request.GET.q }}'>
</form>