title: ActiveRecord: how to destroy object so that its id gets free
body: <p>I <strong>create</strong> 10 records, I <strong>destroy</strong> 10 records. I <strong>create</strong> another 10 records and now first of those records has the <em>id</em> of 11. I want it to automatically be assigned to 1. </p>
  
  <p>How to destroy an object in such a way that its index is gets free?</p>