Auto-filling others ImageFields based on the original one

Hi,

I have to save 3 versions of uploaded photo (and i dont want to use solr) , original one and two which are resized versions of the original one.

I need  those two additional photos as ImageFields in my model , due to the fact that i want to use django ORM.

   

Class Post(model.Models):
    
    #...
    photo = models.ImageField(upload_to="photo_album")
    original_photo = models.ImageField(upload_to="photo_album/originals", null=True)
    thumbnail = models.ImageField(upload_to="photo_album/thumbnails", null=True)

I have tried overriding the save method 

 

    def save(self):
            self.thumbnail.file = self.photo.file
            self.original_photo.file = self.photo.file
            super(Post, self).save()

But that is not working (why?).

Any advice on how to solve this is much appreciated. Thanks!

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