rakkapy/books/models.py

from django.db import models
from datetime import date

# Create your models here.
class Book(models.Model):
	title=models.CharField(max_length=200)
	url=models.CharField(max_length=100)
	added=models.DateField(auto_now_add=True)
	
	@property
	def last_updated(self):
		chaps=Chapter.objects.filter(book=self).order_by('added')
		return chaps[0].added if chaps else None
	
	def __str__(self):
		return self.title

class Chapter(models.Model):
	book=models.ForeignKey(Book, on_delete=models.CASCADE)
	number=models.IntegerField(default=0)
	title=models.CharField(max_length=200, blank=True, null=True)
	contents=models.TextField(blank=True, null=True)
	added=models.DateField(auto_now_add=True)
	
	def __str__(self):
		return self.title or self.book.title+' '+str(self.number)