如何在Django中显示Category下的子类别？

# models.py
from django.db import models

class Category(models.Model):
    name = models.CharField(max_length=100)
    parent = models.ForeignKey('self', null=True, blank=True, on_delete=models.CASCADE, related_name='children')

    def __str__(self):
        return self.name

# views.py
from django.shortcuts import render
from .models import Category

def category_detail(request, category_id):
    category = Category.objects.get(id=category_id)
    children = category.children.all()
    return render(request, 'category_detail.html', {'category': category, 'children': children})

# category_detail.html
<h1>{{ category.name }}</h1>
<ul>
    {% for child in children %}
        <li>{{ child.name }}</li>
    {% endfor %}
</ul>