Django按类别Id显示子类别

from django.db import models

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

class Subcategory(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, Subcategory

def show_subcategories(request, category_id):
    category = Category.objects.get(id=category_id)
    subcategories = Subcategory.objects.filter(category=category)
    return render(request, 'subcategories.html', {'subcategories': subcategories})

{% for subcategory in subcategories %}
    <p>{{ subcategory.name }}</p>
{% empty %}
    <p>No subcategories found.</p>
{% endfor %}