在 Django 查询中与父母一起获取子数据 [英] Fetch child data with parents in Django queries

问题描述

我有两个 Model Product 和 ProductBundle.ProductBundle 有一个 Product Model 的外键.如何使用产品包访问所有产品的列表.

I have two Model Product and ProductBundle. ProductBundle have a foreign key of Product Model. How can I access a list of all product with there productbundle.

class Product(models.Model):
    title = models.CharField(verbose_name="Product Title", max_length=500)

class ProductBundle(models.Model):
    product = models.ForeignKey(Product,on_delete=models.CASCADE,related_name="product")
    bundle_product = models.ForeignKey(Product,on_delete=models.CASCADE,related_name="bundle_product",default="")
    quantity = models.IntegerField(default="1")

我想获取所有带有 productbundle id 的产品，例如单个变量中的父级到子级.

I want to fetch all product with there productbundle ids like parent to childs in a single variable.

谢谢.

推荐答案

您已经拥有 ProductBundle 对象作为 每个Product的相关对象引用.

You already have ProductBundle objects as a Related objects reference for each Product.

假设您执行 products = Product.objects.all()，您可以通过执行以下操作访问每个产品的捆绑包:

Assuming you do products = Product.objects.all() you can access each product's bundles by doing:

for product in products:
    product_bundles = product.productbundle_set.all()

根据评论进行

如果您想在模板中显示所有产品及其捆绑包，您几乎可以做同样的事情.在您的 view 中获取变量中的所有产品，例如 products = Product.objects.all() 并将其传递给模板.假设您的变量名为 products，您可以执行以下操作:

If you want to show all products with their bundles in a template you can do almost the same thing. In your view get all products within a variable, for example products = Product.objects.all() and pass it to the template. Assuming your variable is called products you can do:

{% for product in products %}
    <h1>{{product.title}}</h1>
    <h1>Bundles:</h1>
    {% for bundle in product.productbundle_set.all %}
        <h2>{{bundle.quantity}}</h2>
    {% endfor %}
{% endfor %}

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