如何使用过滤器在django中按价格从低到高和从高到低对产品进行排序

Question

我想按价格从低到高和从高到低对产品列表进行排序并在模板中呈现

我的模型.py

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')
    can_buy = models.ForeignKey(For, on_delete=models.CASCADE, related_name='for_wearing')
    name = models.CharField(max_length=200, blank=False)
    contain_size = models.CharField(max_length=50, blank=True)
    brand_name = models.CharField(max_length=100, blank=False, default='Bagh')
    first = models.ImageField(upload_to='items', blank=False)
    second = models.ImageField(upload_to='items', blank=False)
    third = models.ImageField(upload_to='items', blank=True)
    fourth = models.ImageField(upload_to='items', blank=True)
    fifth = models.ImageField(upload_to='items', blank=True)
    rating = models.FloatField(blank=False,default='4.0')
    item_video = models.FileField(upload_to='item_vedio', blank=True)
    color = models.CharField(max_length=30, blank=False, default='Black')
    material = models.CharField(max_length=50, blank=False, default='Plastic' )
    return_policy = models.CharField(max_length=100, blank=False, default='7Days Return Policy')
    stock = models.CharField(max_length=50, blank=False, default='In Stock')
    price = models.FloatField(blank=False,)
    actual_price = models.FloatField(blank=False)
    type = models.CharField(blank=False, max_length=100, default='washable')
    about = models.CharField(blank=False,max_length=100, default='Lusturous')
    offer = models.CharField(max_length=4, blank=True)
    joined_date = models.DateTimeField(default=timezone.now,editable=False)
    update_at = models.DateTimeField(auto_now=True)
    description = models.TextField(blank=True)
    
    def __str__(self):
        return self.name


class Subcategories(models.Model):
    categories = models.ForeignKey(Categories, on_delete=models.CASCADE, related_name='our_categories')
    name = models.CharField(max_length=200, blank=False)
    joined_date = models.DateTimeField(default=timezone.now,editable=False)
    update_at = models.DateTimeField(auto_now=True)

    def __str__(self):
        return self.name

这是我的意见.py

class Product(View):
    def get(self, request, subcategory_id):
        subcategory = get_object_or_404(Subcategories, pk=subcategory_id)
        products = subcategory.products.all()
        category_list = Categories.objects.all()
        print(products)
        return render (request, 'products.html',{"subcategory_list" : products, 'category_list': category_list })

我的html

<div class="col-10">
            <ul>
              <li class="filters"><strong>Sort By :</strong></li>
              <li class="filters"><a class="filter_by" href="">Popularity</a></li>
              <li class="filters"><a class="filter_by" href="">Price:--low to high</a></li>
              <li class="filters"><a class="filter_by" href="">Price:-- high to low</a></li>
              <li class="filters"><a class="filter_by" href="">Newest First</a></li>
              <li class="filters"><a class="filter_by" href="">Discount</a></li>
            </ul>
        </div>
        <section class="col-10">
          {% for products in subcategory_list %}
          <a class="products" href="{% url 'products:detail' item_id=products.id %}">
          <div class="card col-4" style="width: 18rem; height:420px">
              <img class="img" src="{{ products.first.url }}" alt="" height="300px" width="100%" onmouseover="this.src='{{ products.second.url }}'"
              onmouseout="this.src='{{ products.first.url }}'" >
              <div class="detail">
              <h4 class="price">{{ products.price|currency}}</h4>
              <h5>{{products.name}} <br> <span class="brand">{{ products.brand_name}}</span> <span class="btn btn-success buton">✔Authentic</span> </h5>
              <p class="rate">Rate: {{products.rating}}<i class="fas fa-star"></i></p>
              <h6>Size:<span> {{products.contain_size}}</span> </h6>
              </div>
            </div>
          </a>
            {% endfor %} 
          </div>  
        </section>

如您所见，我创建了一个 div 并在其中进行了排序，因此当用户单击该链接时，它会按该顺序呈现产品列表，但是我不知道如何看到一些文档，但是这似乎不是实现这一目标的最佳方式任何想法是实现这一目标的最佳方式 谢谢你的时间

Answer 1

在你的 html 中

<li class="filters"><a class="filter_by" href="?sort=l2h">Price:--low to high</a></li>
<li class="filters"><a class="filter_by" href="?sort=h2l">Price:-- high to low</a></li>

在你看来

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")

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

解释：

当您从前端单击排序链接时，只需在浏览器中查看您的 url。 我们正在发送一个sort 参数，告诉我们应该如何对其进行排序。

我们在视图中检索该参数

sort_by = request.GET.get("sort", "l2h") 

注意：如果没有提供参数（当用户访问该页面时），它将按l2h aka low to high 排序

你可以相应地改变它，你想要什么默认排序/过滤

最后，我们只是使用 django 查询来过滤掉我们的数据。

在你的模板中使用它