get_absolute_url

from django.conf import settings
from django.db import models
from django.urls import reverse


class Note(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    title = models.CharField(max_length=120)
    image = models.ImageField(null=True, blank=True)
    url = models.URLField(null=True, blank=True)
    created = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('note_details', args=[self.id])