silverstripe-framework/core/model/RelationList.php

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<?php
/**
* A DataList that represents a relation.
* Adds the notion of a foreign ID that can be optionally set.
*
* @todo Is this additional class really necessary?
*/
abstract class RelationList extends DataList {
protected $foreignID;
/**
* Set the ID of the record that this ManyManyList is linking *from*.
* @param $id A single ID, or an array of IDs
*/
function setForeignID($id) {
// Turn a 1-element array into a simple value
if(is_array($id) && sizeof($id) == 1) $id = reset($id);
$this->foreignID = $id;
$this->dataQuery->filter($this->foreignIDFilter());
}
/**
* Returns this ManyMany relationship linked to the given foreign ID.
* @param $id An ID or an array of IDs.
*/
function forForeignID($id) {
$this->setForeignID($id);
return $this;
}
abstract protected function foreignIDFilter();
}