Burakk's Image Model (Simplified)

models.py

from django.db import models
from imagekit.processors import *
from imagekit.models.fields import ImageSpecField
import os


def get_thumb_processors(instance, file):
        return [resize.ResizeToFill(width=instance.thumb_width,
                height=instance.thumb_height)]


def cache_to_thumb(instance, path, specname, extension):
    return os.path.join('uploads', 'images', 'thumbs',
            '%s.jpeg' % instance.slug)


def get_path(instance, filename):
    return os.path.join('uploads', 'images', 'bigs', '%s.jpeg' % instance.slug)


class Image(models.Model):
    slug = models.CharField(max_length=15)
    thumb_width = models.IntegerField(blank=True, null=True)
    thumb_height = models.IntegerField(blank=True, null=True)
    file = models.ImageField(upload_to=get_path)

    thumbnail = ImageSpecField(processors=get_thumb_processors,
            image_field='file', options={'quality': 90},
            cache_to=cache_to_thumb)

    def save(self, *args, **kwargs):
        super(Image, self).save(*args, **kwargs)
        test = Image.objects.all()[0]
        test.thumbnail.width

    def __unicode__(self):
        return self.slug