title: Laravel 'save()' for 'hasmany' Model
body: <p>If I have a two models, with a hasMany relationship, so my <code>Car</code> hasmany <code>CarOwners</code>, I would like to use to use the <code>firstOrCreate</code> method to create a new <code>car</code>. </p>
  
  <p>If I'm creating a new <code>car</code> then I need to create the first <code>CarOwner</code>too. </p>
  
  <p>Without leveraging any laravel functionality, I would </p>
  
  <ol>
  <li>create a new car, </li>
  <li>get the ID of the new car object</li>
  <li>create a new CarOwner, associating it with the recently created <code>car</code></li>
  </ol>
  
  <p>Isn't there a way to do this in one go? I can do the queries to <em>find</em> the CarOwners of the chosen car, but I can't see how to <em>save</em> across multiple tables. </p>