Iterate through activerecords

Hello,

I am a Rails newbie and I have problems to iterate through a list of
records.

pseudo code.

def do something
   @userlist = User.find(:all)
   @userlist.each {|item| item.calculate_stats item.save}
end

Ther problem is that running this throws an error:
ArgumentError (wrong number of arguments (1 for 0)):

Any ideas what's goung wrong?

Thanks!
Chris