Hi,
I'm working on an asset managment app, that will rename uploaded files
according to a specified nomenclature.
Now, what I'd like to do is to write a validator which will check if a
( renamed ) file is already existing. Writing the validator itself
isnt too hard; I can just use pre_save.connect and call a function
from here. What I do not know is how I can hook up this validator such
that it informs the user that the file is already uploaded. Would
someone point me in the right direction? Many thanks in advance!
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