class Debug(caching.base.CachingMixin, models.Model):
    text = models.CharField(max_length=512, blank=True, null=True)
    img = ImageWithThumbsField(
        verbose_name='image',
        upload_to='uploads/projects/',
        styles=({'w': 100, 'h': 100},),
        thumb_method=generate_thumb_square_top,
        blank=True, null=True
    )
    objects = caching.base.CachingManager()

from django.core.management.base import NoArgsCommand
class Command(NoArgsCommand):
    def __init__(self):
        pass

    def handle_noargs(self, **options):
        from django.core.cache import cache
        from atizo.apps.debug.models import Debug

        def _add_objects(count):
            print "add %d" % count
            n = 0
            while n < count:
                Debug().save()
                n += 1

        def _fetch_via_list():
            print "via list()"
            cache.clear()
            # populate cache
            query = list(Debug.objects.all())
            for entry in query: img = entry.img.url_100x100
            # fetch from cache
            query = list(Debug.objects.all())
            for entry in query: img = entry.img.url_100x100

        def _fetch_via_iterator():
            print "via iterator"
            cache.clear()
            # populate cache
            query = Debug.objects.all()
            for entry in query: img = entry.img.url_100x100
            # fetch from cache
            query = Debug.objects.all()
            try:
                for entry in query: img = entry.img.url_100x100 # <- will fail if there are more than 100 obj's
            except:
                print "fail!"


        Debug.objects.all().delete()
        cache.clear()

        _add_objects(1)
        _fetch_via_list() # success
        _fetch_via_iterator() # success

        _add_objects(98) # total 99
        _fetch_via_list() # success
        _fetch_via_iterator() # success

        _add_objects(1) # total 100
        _fetch_via_list() # success
        _fetch_via_iterator() # fail

        _add_objects(270) # total 370
        _fetch_via_list() # success
        _fetch_via_iterator() # fail