title: Construct relationship in models in rails and Insert data into it
body: <p>How to construct a model in rails 3</p>
  
  <ol>
  <li><p>user having one profile.</p></li>
  <li><p>user having one notification</p></li>
  <li><p>user having one role such as admin etc.</p></li>
  </ol>
  
  <p>I want to make their relation ship.
  After making it.</p>
  
  <p><strong>How to use one form to insert data into all these tables at a time.</strong></p>
  
  <p>Any help will be appriciated..
  Thank you</p>