title: In Rails, after using find with :select, my objects don't save
body: <p>Running something like:</p>
  
  <p>@users = User.find(:first, :select => "name, lastname, salary")
  for @user in @users do
    @user.salary = 100000
    @user.save
  end</p>
  
  <p>After this looking up in the Mysql table, the users aren't updated.</p>