Validates_associated causing weird results

I’d almost think the presence of “validates_associated” is causing the
associated model to run validation twice. The associated model, Upload,
which handles uploaded files and saves them, is saving each uploaded
file twice in a row. This doesn’t happen if I remove
“validates_associated” from the model it belongs to, or if I have the
model save files during after_create instead of

I have changed it so it works for the time being, but at the moment I’m

Even in the Image model which is a subclass of Upload, thumbnails made
with RMagick are saved twice instead of once. I have no idea why.

I’ve pastied everything. There’s really nothing complicated going on

So I’m imagining, although I could be wrong, that validates_associated
is somehow causing validation on the associated Upload to be run twice,
and since it’s run twice then similarly so is
after_validation_on_create, which is thus causing files to be written
twice. Any ideas?