question has_many formats

[tom]

hi

i have 2 models, gallery<has_many>media, gallery is a STI model, and i was wondering how i can achieve to have different peperclip formats for different galleries. what i want is that:

if gallerytype==item

- media format should be:

orignal, thumb, medium

if gallerytype==user

- media format should be:

thumb

 and so on

how can i check that before paperclips starts processing?

thx