django - override save method - 'ImageFile' object has no attribute '_committed' -


i override save method below, , get_thumbnails , save sorl..

but error 'imagefile' object has no attribute '_committed'

class hotelphotos(models.model):     hotel = models.foreignkey(hotel, related_name='photos')     code = models.charfield(max_length=255)     original = models.imagefield(upload_to="media")     medium = models.imagefield(upload_to="media", null=true, editable=false)     thumbnail = models.imagefield(upload_to="media", null=true, editable=false)      def save(self, *args, **kwargs):          super(hotelphotos, self).save(*args, **kwargs)         self.medium = get_thumbnail(self.original,                                     '100x100',                                     crop='center',                                     quality=99)          self.thumbnail = get_thumbnail(self.original,                                        '50x50',                                        crop='center',                                        quality=99)          super(hotelphotos, self).save(*args, **kwargs)

any ideas ? 

self.thumbnail = get_thumbnail(self.original,                                    '50x50',                                    crop='center',                                    quality=99).url

solved problem ..


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