视图add

def add(request):
    dict=request.GET
    gid=int(dict.get('gid'))
    count=int(dict.get('count'))

    uid=request.session.get('uid')
    #查询当前用户是否已经购买过此商品，如果未购买则创建，如果已购买则修改数量
    carts=CartInfo.objects.filter(user_id=uid,goods_id=gid)
    if len(carts)==0:
        cart=CartInfo()
        cart.user_id=request.session.get('uid')
        cart.goods_id=int(gid)
        cart.count=int(count)
        cart.save()
    else:
        cart=carts[0]
        cart.count+=count
        cart.save()

    c=calc_count(uid)

    return JsonResponse({'isok':1,'count':c})