Django:如何显示两个或三个模型的数据

from django.db import models

class Category(models.Model):
    name = models.CharField(max_length=100)

class Product(models.Model):
    name = models.CharField(max_length=100)
    category = models.ForeignKey(Category, on_delete=models.CASCADE)

from django.shortcuts import render
from .models import Category, Product

def products(request):
    categories = Category.objects.all()
    products = Product.objects.all()
    return render(request, 'products.html', {'categories': categories, 'products': products})

{% for category in categories %}
    <h2>{{ category.name }}</h2>
    <ul>
    {% for product in products %}
        {% if product.category == category %}
            <li>{{ product.name }}</li>
        {% endif %}
    {% endfor %}
    </ul>
{% endfor %}

from django.urls import path
from .views import products

urlpatterns = [
    path('products/', products, name='products'),
]