def trans(request, design_id):
    helper = CostFormSetHelper()
    if request.method == 'POST':
        formset = CostFormSet(request.POST)
        if formset.is_valid:
            pass
    if request.method == 'GET':
        design_material = Material.objects.filter(design__pk=design_id)
        formset = CostFormSet(queryset=design_material)
    return render(request, "designs/trans.html", {'formset': formset, 'helper': helper, 'design_id': design_id})