I think you're adding only book_images and no author_images at all. But 
I'm nbot sure, because you're not providing your code

Try something like this:
@asset.imageable = @author
or
AuthorImage.create attributes

I don't know if you made the right decision with using polymorphic 
associations. You need to provide more information what your 
associations are. For example: Author has_many Images OR Author has_one 
image
And can the image belong to a book and an author as well?

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