Parent class doesn't respect before_save filter of Child class

[sebitoelcheater]

Suppose we have a Parent class and his Child class, let's say Attachment and Image respectively. If i put a before_save in Image, let's say

class Image
   act_as :attachment
   before_save :check_something
end

the check_something method won't be respected by Attachment, and any param that were in Attachment model and that were changed before executing image.save, will be saved anyway, whether it doesn't pass the check_something filter.

[hzamani]

Can you explain this with a detailed example with attributes.