Hello,

I have a small photo gallery application.  My model has two classes,
Gallery and Photo.  Gallery contains information on the width and
height of the thumbnails of its photos.  I added a post_save signal so
that when a Gallery object is saved, all the photo thumbnails are
recreated to match the specified width and height.  This means that
changing information unrelated to the thumbnails recreates them.

I would like to know if it's possible to find which fields have been
update so that I could resize the thumbnails only when the width or
height attributes have been changed.  Is that possible?

-Vincent


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