mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
124 lines
3.2 KiB
PHP
124 lines
3.2 KiB
PHP
<?php
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/**
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* Subclass of {@link DataList} representing a has_many relation.
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*
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* @package framework
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* @subpackage model
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*/
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class HasManyList extends RelationList {
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protected $foreignKey;
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/**
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* Create a new HasManyList object.
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* Generation of the appropriate record set is left up to the caller, using the normal
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* {@link DataList} methods. Addition arguments are used to support {@@link add()}
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* and {@link remove()} methods.
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*
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* @param string $dataClass The class of the DataObjects that this will list.
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* @param string $foreignKey The name of the foreign key field to set the ID filter against.
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*/
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public function __construct($dataClass, $foreignKey) {
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parent::__construct($dataClass);
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$this->foreignKey = $foreignKey;
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}
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/**
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* Gets the field name which holds the related object ID.
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*
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* @return string
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*/
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public function getForeignKey() {
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return $this->foreignKey;
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}
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protected function foreignIDFilter($id = null) {
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if ($id === null) {
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$id = $this->getForeignID();
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}
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// Apply relation filter
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$key = DataObject::getSchema()->sqlColumnForField($this->dataClass(), $this->getForeignKey());
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if(is_array($id)) {
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return array("$key IN (".DB::placeholders($id).")" => $id);
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} else if($id !== null){
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return array($key => $id);
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}
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return null;
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}
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/**
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* Adds the item to this relation.
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*
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* It does so by setting the relationFilters.
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*
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* @param DataObject|int $item The DataObject to be added, or its ID
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*/
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public function add($item) {
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if(is_numeric($item)) {
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$item = DataObject::get_by_id($this->dataClass, $item);
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} else if(!($item instanceof $this->dataClass)) {
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user_error("HasManyList::add() expecting a $this->dataClass object, or ID value", E_USER_ERROR);
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}
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$foreignID = $this->getForeignID();
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// Validate foreignID
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if(!$foreignID) {
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user_error("ManyManyList::add() can't be called until a foreign ID is set", E_USER_WARNING);
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return;
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}
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if(is_array($foreignID)) {
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user_error("ManyManyList::add() can't be called on a list linked to mulitple foreign IDs", E_USER_WARNING);
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return;
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}
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$foreignKey = $this->foreignKey;
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$item->$foreignKey = $foreignID;
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$item->write();
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}
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/**
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* Remove an item from this relation.
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*
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* Doesn't actually remove the item, it just clears the foreign key value.
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*
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* @param int $itemID The ID of the item to be removed.
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*/
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public function removeByID($itemID) {
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$item = $this->byID($itemID);
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return $this->remove($item);
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}
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/**
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* Remove an item from this relation.
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* Doesn't actually remove the item, it just clears the foreign key value.
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*
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* @param DataObject $item The DataObject to be removed
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* @todo Maybe we should delete the object instead?
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*/
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public function remove($item) {
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if(!($item instanceof $this->dataClass)) {
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throw new InvalidArgumentException("HasManyList::remove() expecting a $this->dataClass object, or ID",
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E_USER_ERROR);
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}
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// Don't remove item which doesn't belong to this list
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$foreignID = $this->getForeignID();
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$foreignKey = $this->getForeignKey();
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if( empty($foreignID)
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|| (is_array($foreignID) && in_array($item->$foreignKey, $foreignID))
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|| $foreignID == $item->$foreignKey
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) {
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$item->$foreignKey = null;
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$item->write();
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}
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}
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}
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