如何在 Django 中对搜索结果项进行排序

Question

我有搜索字段，我想为用户提供排序选项，以便用户可以在搜索结果中按从低到高到低的价格进行排序，但无法实现我的观点

class search_item(View):
    def get(self, request):
        search_item = request.GET.get('search')
        if search_item:
            items = Item.objects.filter(Q(name__icontains=search_item)|Q(color__icontains=search_item))
            sort_by = request.GET.get("sort", "l2h") 
            if sort_by == "l2h":
                item = items.order_by("price")
            elif sort_by == "h2l":
                item = items.order_by("-price")
            return render(request, 'search_result.html', {'items':item})

它执行搜索但无法对我的代码中的错误进行排序

html

 <li><a class="dropdown-item" href="?sort=l2h">Low To High</a></li>
 <li><a class="dropdown-item" href="?sort=h2l">High To Low</a></li>

我的模型

class Item(models.Model):
    categories = models.ForeignKey(Categories, on_delete=models.CASCADE, related_name='our_items')
    subcategories = models.ForeignKey(Subcategories, on_delete=models.CASCADE, related_name='products')
    name = models.CharField(max_length=200, blank=False)
    swag = models.BooleanField(blank=False, default=False)
    male = models.BooleanField(blank=False, default=False)
    female = models.BooleanField(blank=False, default=False)
    unisex = models.BooleanField(blank=False, default=False)
    first = models.ImageField(upload_to='items', blank=False)
    second = models.ImageField(upload_to='items', blank=False)
    third = models.ImageField(upload_to='items', blank=True)
    color = models.CharField(max_length=30, blank=False, default='Black')
    material = models.CharField(max_length=50, blank=False, default='Plastic' )
    price = models.FloatField(blank=False,)
    description = models.TextField(blank=True)
    
    @staticmethod
    def get_items_by_id(ids):
        return Item.objects.filter(id__in = ids)

    def __str__(self):
        return self.name

我的url

path('search-result/',search_item.as_view(),name='search')

按重新使用的商品价格排序时出错视图 products.views.search_item 没有 return HttpResponse 对象。它 return 改为 None。

回溯

Traceback (most recent call last):
  File "C:\Users\mithlesh\Desktop\coolbuy2.0\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
    response = get_response(request)
  File "C:\Users\mithlesh\Desktop\coolbuy2.0\lib\site-packages\django\core\handlers\base.py", line 188, in _get_response
    self.check_response(response, callback)
  File "C:\Users\mithlesh\Desktop\coolbuy2.0\lib\site-packages\django\core\handlers\base.py", line 309, in check_response
    raise ValueError(

Exception Type: ValueError at /search-result/
Exception Value: The view products.views.search_item didn't return an HttpResponse object. It returned None instead.

查看排序工作完美无缺的视图

class Product(View):
    def get(self, request, subcategory_id):
        subcategory = get_object_or_404(Subcategories, pk=subcategory_id)

        sort_by = request.GET.get("sort", "l2h") 
        if sort_by == "l2h":
           products = subcategory.products.order_by("price")
        elif sort_by == "h2l":
           products = subcategory.products.order_by("-price")
        sort_by = request.GET.get("sort", "newest")
        if sort_by == "unisex":
            products = subcategory.products.order_by("-unisex")
        elif sort_by == "newest":
            products = subcategory.products.order_by("-update_at")
        sort_by = request.GET.get("sort", "male")
        if sort_by == "male":
            products = subcategory.products.order_by("-male")
        elif sort_by == "female":
            products = subcategory.products.order_by("-female")

        category_list = Categories.objects.all()
        return render (request, 'products.html',{"subcategory_list" : products, 'category_list': category_list })

Answer 1

以下错误信息是关键：

products.views.search_item didn't return an HttpResponse object. It returned None instead.

它告诉你，你的 products.views.search_item 方法 returned None。怎么可能returnNone？它 returns None，隐含地，当 search_item 有一个假值时，它完全跳过项目的 reading/sorting。当 search 参数不存在（或为空）时会发生这种情况。

如何在 Django 中对搜索结果项进行排序

how to do sorting of a search result item in django

django

django-views

django-class-based-views