models.py

from django.db import models

# Create your models here.

class List(models.Model):
    pass

class Item(models.Model):
    text = models.TextField(default='')
    list = models.ForeignKey(List, default=None,on_delete=models.CASCADE)
    slug = models.SlugField(blank=True)
    
    class Meta:
        ordering = ('id',)
        unique_together = ('list', 'text')