/**
* Returns the groups a user is authorized to access.
*
* @return \Illuminate\Database\Eloquent\Relations\HasMany
*/
public function authorized_groups()
{
$groupIds = GroupMember::where('user_id', '=', $this->id)->where('target_type', '=', 'Group')->lists('target_id')->toArray();
return Group::whereIn('id', $groupIds)->get();
}
