class Publishers(models.Model): #Класс для алимов
    photo      = models.ImageField(upload_to=os.path.join(settings.MEDIA_URL,'pic/bio_photos/'))

class Video(models.Model):
    publisher   = models.ForeignKey(Publishers)

class Publishers(models.Model): #Класс для алимов
    photo      = models.ImageField(upload_to=os.path.join(settings.MEDIA_URL,'pic/bio_photos/'))
    
    def get_video(self):
        return self.video_set.all()
        
class Video(models.Model):
    publisher   = models.ForeignKey(Publishers)

def publisher_detail(request):
    publisher = Publishers.objects.get(id=1)
    videos = publisher.get_video()