title: Laravel 5.2 Model sync() except field
body: <p>So I'm having $user as an instance of User model, and when I'm doing 
  <code>$user-&gt;data()-&gt;sync($new_data)</code> the fields <strong>address, country and postal_code</strong> get updated.</p>
  
  <p>But what if I want to update <strong>everything except country</strong>? Is there some way to do like
  <code>$user-&gt;data()-&gt;sync($new_data)-&gt;except('country')</code>?</p>
  
  <p>Can't find anything in docs so far.</p>