Doctrine2 Iteration - doctrine-orm

Question

I have the following code for a <select> on a form.
$query = $em->createQuery("SELECT g.name, g.id FROM SSMURBS\Group g ORDER BY g.name ASC");`
$groups = $query->iterate();`
$groups_option = "";
foreach( $groups as $row ){
$group = $row[0];
$groups_option .= "<option val=\"{$group['id']}\">{$group['name']}</option>\n";
}
But this throws an error. What works is...
$query = $em->createQuery("SELECT g.name, g.id FROM SSMURBS\Group g ORDER BY g.name ASC");
$groups = $query->iterate();
$groups_option = "";
$i = 0;
foreach( $groups as $row ){
$group = $row[$i];
$groups_option .= "<option val=\"{$group['id']}\">{$group['name']}</option>\n";
$i++;
}
Am I doing something wrong? The reference manual cites the first option as correct...

Answer 1

I found the answer to my own question:
While DQL permits SELECT g.id, g.name without throwing an error, this is actually SQL, not DQL. (Thanks, doctrine reference manual, for being so clear on this...)
The correct way to code this is
$query = $em->createQuery("SELECT partial g.{id,name} FROM SSMURBS\Group g ORDER BY g.name ASC");
$groups = $query->iterate();
$groups_option = "";
foreach( $groups as $group ){
$group = $group[0];
$groups_option .= "<option value=\"{$group->id}\">{$group->name}</option>\n";
}

Answer 2

Your variable names are mismatched.
Remove $group = $row[0] and use foreach ($groups as $group)
$query = $em->createQuery("SELECT g.name, g.id FROM SSMURBS\Group g ORDER BY g.name ASC");
$groups = $query->iterate();
$groups_option = "";
foreach ( $groups as $group ){
$groups_option .= "<option val=\"{$group['id']}\">{$group['name']}</option>\n";
}