如何使子类别属于Django中的特定类别

Question

我的显示子类别仅在特定类别中存在一些问题。例如：我有一个类别：商业，工厂，健康......之后我可以在商业类别中添加例如自有公司的子类别。在这种情况下，如果我选择类别业务，我需要只有可见的子类别属于此类别。怎么做？ 这是我的代码。 的 models.py

from django.db import models
from slugify import slugify

class Kategoria(models.Model):
    name = models.CharField(max_length=50, unique=True, verbose_name='Nazwa kategorii')
    slug = models.SlugField(verbose_name='Adres SEO')

    class Meta: 
        verbose_name_plural = 'Kategorie'

    def save(self, *args, **kwargs):
        self.slug = slugify(self.name)
        super(Kategoria, self).save(*args, **kwargs)

    def __str__(self):
        return self.name

class Subkategoria(models.Model):
    category = models.ForeignKey('Kategoria', related_name='subkategoria', on_delete=models.CASCADE, blank=True, null=True, verbose_name='Kategoria główna')
    name = models.CharField(max_length=50)

    class Meta:
        verbose_name_plural = 'Subkategorie'

    def __str__(self):
        return self.name

class Strona(models.Model):
    name = models.CharField(max_length=250, verbose_name='Nazwa strony')
    slug = models.SlugField(verbose_name='Adres SEO')
    www = models.CharField(max_length=200, verbose_name='Adres strony', unique=True)
    content = models.TextField(verbose_name='Opis')
    category = models.ForeignKey('Kategoria', verbose_name='Kategoria', on_delete=models.CASCADE)
    subcategory = models.ForeignKey('Subkategoria', verbose_name='Subkategoria', on_delete=models.CASCADE)
    publish = models.DateField(auto_now=False, auto_now_add=False)

    class Meta:
        verbose_name_plural = 'Strony'

    def __str__(self):
        return self.name