user = models.ForeignKey(User)
upload_date = models.DateTimeField(auto_now_add=True)
title = models.CharFiled(max_length=1000, blank=True)


class ImageItem(MediaItem):
    image = models.ImageField(upload_to=img_get_file_path)


class VideoItem(MediaItem):
    video = models.FileField(upload_to=vid_get_file_path)


class AudioItem(MediaItem):
    audio = models.FileField(upload_to=aud_get_file_path)
Django: Упорядоченный список экземпляров моделей из разных моделей?