title: Laravel update or create an Item
body: <p>I have this question about Laravel:</p>
  
  <p>I have a my model and my RestfulAPI controller.</p>
  
  <p>Into the store() method I would check if I have an element that already has the field 'myField' (myField id different from 'id') equal to what I have to create. If it already exist then I would like to update, otherwise I would simply create (save())..</p>
  
  <p>Have I to use find() method? </p>