79 lines
1.9 KiB
PHP
79 lines
1.9 KiB
PHP
<?php
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namespace SilverStripe\ORM;
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use Exception;
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/**
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* A DataList that represents a relation.
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*
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* Adds the notion of a foreign ID that can be optionally set.
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*
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* @package framework
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* @subpackage orm
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*/
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abstract class RelationList extends DataList implements Relation {
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public function getForeignID() {
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return $this->dataQuery->getQueryParam('Foreign.ID');
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}
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public function getQueryParams() {
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$params = parent::getQueryParams();
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// Remove `Foreign.` query parameters for created objects,
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// as this would interfere with relations on those objects.
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foreach(array_keys($params) as $key) {
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if(stripos($key, 'Foreign.') === 0) {
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unset($params[$key]);
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}
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}
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return $params;
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}
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/**
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* Returns a copy of this list with the ManyMany relationship linked to
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* the given foreign ID.
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*
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* @param int|array $id An ID or an array of IDs.
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* @return static
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*/
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public function forForeignID($id) {
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// Turn a 1-element array into a simple value
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if(is_array($id) && sizeof($id) == 1) $id = reset($id);
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// Calculate the new filter
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$filter = $this->foreignIDFilter($id);
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$list = $this->alterDataQuery(function($query, $list) use ($id, $filter){
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// Check if there is an existing filter, remove if there is
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$currentFilter = $query->getQueryParam('Foreign.Filter');
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if($currentFilter) {
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try {
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$query->removeFilterOn($currentFilter);
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}
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catch (Exception $e) { /* NOP */ }
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}
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// Add the new filter
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$query->setQueryParam('Foreign.ID', $id);
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$query->setQueryParam('Foreign.Filter', $filter);
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$query->where($filter);
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});
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return $list;
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}
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/**
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* Returns a where clause that filters the members of this relationship to
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* just the related items.
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*
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*
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* @param array|integer $id (optional) An ID or an array of IDs - if not provided, will use the current ids as
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* per getForeignID
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* @return array Condition In array(SQL => parameters format)
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*/
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abstract protected function foreignIDFilter($id = null);
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}
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