title: symfony - adding a user to a group (sfGuardUserGroup) in a form
body: <p>I'm trying to save some users in a custom admin form and I'd like to set them in a particular group, in the <code>sfGuardUserGroup</code>.</p>
  
  <p>So If the user I've just created has an id of 25, then I'd expect an entry in the <code>sfGuardUserGroup</code> table with a <code>user_id</code> of 25 and a <code>group_id</code> of <code>8</code> (8 is my group id I want o add these users to.)</p>
  
  <p>Could I do this in the form class, or in the <code>processForm</code> action?</p>
  
  <p>I'm using doctrine and SF1.4</p>
  
  <p>Thanks</p>