title: How to create a new object, passing it some parameters, and then saving it
body: <p>I want to create a new object, passing it some initial values, and then saving to the db and return the saved object.</p>
  
  <p>how can I do this?</p>
  
  <p>example:</p>
  
  <ol>
  <li>create a new user object</li>
  <li>initiaze the user.user_age property to 35</li>
  <li>save and return the saved object b/c I need access to the user.user_id value.</li>
  </ol>
  
  <p>What's the ruby way of doing this?</p>