uploaded_at = models.DateTimeField(_('creation date'), auto_now_add=True, editable=False)
extra_info = JSONField(_('extra information'), default='{}', editable=False)
book = models.ForeignKey('Book', related_name='media')
uploaded_at = models.DateTimeField(_('creation date'), auto_now_add=True, editable=False)
extra_info = JSONField(_('extra information'), default='{}', editable=False)
book = models.ForeignKey('Book', related_name='media')