title: How to update only specific fields of an active record in Yii?
body: <p>I have a model (ActiveRecord) that has <strong><em>5 properties</em></strong> (DB columns).<br>
  I fetch a specific record and populate a form that has <strong><em>3 fields</em></strong> (two other fields shouldn't be updated).<br>
  Then I change a specific field and press save.</p>
  
  <p>How to update the record, not touching the fields that are not in form?</p>