/**
* Indexes a collection.
*
* @param mixed $collection An collection to extract index from.
* @param string $name The field name to build index for.
* @return Map An array of indexes where keys are `$name` values and
* values the corresponding index in the collection.
*/
protected function _index($collection, $name)
{
$indexes = new Map();
foreach ($collection as $key => $entity) {
if (is_object($entity)) {
if ($entity->{$name}) {
$indexes->set($entity->{$name}, $key);
}
} else {
if (isset($entity[$name])) {
$indexes->set($entity[$name], $key);
}
}
}
return $indexes;
}
