如何在Django视图中渲染对象？ [英] How To Render An Object In Django Views?

问题描述

我有一个接受URL的表格。然后使用BS4解析此URL，并使用以下类创建产品：

I have a form that accepts URLs. This URL is then being parsed with BS4 and product created with the following class:

class Product(models.Model):
    product_id = models.CharField(max_length=50)
    pub_date = models.DateTimeField(default=datetime.now)
    title = models.CharField(max_length=255)
    url = models.TextField()
    price = models.FloatField()

我只想保存唯一的产品到数据库。因此，我将以下代码添加到了 views.py 文件中的 add 函数中，以按其ID检查产品：

I want to save only unique products to the database. Therefore I added the following code into the add function in the views.py file to check the product by its ID:

def add(request):
    ...
    product.product_id = soup.find('h1', class_='product-id').text
    if Product.objects.filter(product_id=product.product_id):
        return render(request, 'product/add.html', {'error': 'Product already exists'})
    else:
        product.title = soup.find('h1', class_='product-name').text
        ...
        product.save()
        return redirect('/product/' + str(product.id))

当前，用户收到产品已存在错误消息。但是我实际上想渲染已经存在的产品。这是详细产品的功能：

Currently, user receives the 'Product already exists' error message. But I want to actually render the already existing product instead. Here is the function for detailed product:

def detail(request, product_id):
    product = get_object_or_404(Product, pk=product_id)
    return render(request, 'product/detail.html', {'product': product})

详细产品的URL如下所示： http://example.com/product / 22
可能有一种更好的方法来检索，比较然后呈现对象。请告诉我。

The URL to detailed product looks like this: http://example.com/product/22 There is probably a better way to retrieve, compare and then render an object. Please let me know. Thanks in advance!

推荐答案

您可以直接重定向到产品的已定义get_absolute_url属性吗？

Can you just redirect to the Product's defined get_absolute_url property?

def add(request):
    ...
    product.product_id = soup.find('h1', class_='product-id').text
    existing_product = Product.objects.filter(product_id=product.product_id)
    if existing_product:
        return redirect(existing_product.get_absolute_url())

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