title: f.select, passing an id, but showing a name in Rails
body: <p>I need to have a form, in which user can select two players from a list (two separate select fields).
  Later, in controller I need to find those two Player instances.
  I know the only way to pass an object in a form is to use its id, but I obsiously can't make user select a raw number - I'd like to have ability to show players' names in a select box, but to somehow pass an id. Is it possible?</p>