[Rails] Problem with attr_accessor

I pass a value from controller to model with attr_accessor. before_save
works fine but not after_find. What could be wrong?

This is what I use in index
@test = Test.find(:all)
@test.each {|a| a.key = cookies[:thekey]}

and this in create, show, edit:

@test.key = cookies[:thekey]

This is my model:
attr_accessor :key

after_find :decrypt_data
define_method(:after_find) { }
before_save :crypt_data

private

def crypt_data
self.name = Crypto.encrypt(self.name,key)
end

def decrypt_data
self.name = Crypto.decrypt(self.name,key)
end
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