dj_ep5_model_playlist.py

from django.db import models

class PlayList(models.Model):
    title = models.CharField(max_length=255)
    slug = models.SlugField()
    description = models.TextField()    
    
    def __str__(self):
        return self.title 
        
class Lecture(models.Model):
    playlist = models.ForeignKey(PlayList,on_delete=models.CASCADE)
    title = models.CharField(max_length=255)
    slug = models.SlugField()
    description = models.TextField()
    video_url = models.CharField(max_length=500)
    
    def __str__(self):
        return self.title