silverstripe-framework/model/HasManyList.php

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<?php
/**
* Subclass of {@link DataList} representing a has_many relation
*/
class HasManyList extends RelationList {
protected $foreignKey;
/**
* Create a new HasManyList object.
* Generation of the appropriate record set is left up to the caller, using the normal
* {@link DataList} methods. Addition arguments are used to support {@@link add()}
* and {@link remove()} methods.
*
* @param $dataClass The class of the DataObjects that this will list.
* @param $relationFilters A map of key => value filters that define which records
* in the $dataClass table actually belong to this relationship.
*/
function __construct($dataClass, $foreignKey) {
parent::__construct($dataClass);
$this->foreignKey = $foreignKey;
}
protected function foreignIDFilter() {
// Apply relation filter
if(is_array($this->foreignID)) {
return "\"$this->foreignKey\" IN ('" .
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implode("', '", array_map('Convert::raw2sql', $this->foreignID)) . "')";
} else if($this->foreignID){
return "\"$this->foreignKey\" = '" .
Convert::raw2sql($this->foreignID) . "'";
}
}
/**
* Adds the item to this relation.
* It does so by setting the relationFilters.
* @param $item The DataObject to be added, or its ID
*/
function add($item) {
if(is_numeric($item)) $item = DataObject::get_by_id($this->dataClass, $item);
else if(!($item instanceof $this->dataClass)) user_error("HasManyList::add() expecting a $this->dataClass object, or ID value", E_USER_ERROR);
// Validate foreignID
if(!$this->foreignID) {
user_error("ManyManyList::add() can't be called until a foreign ID is set", E_USER_WARNING);
return;
}
if(is_array($this->foreignID)) {
user_error("ManyManyList::add() can't be called on a list linked to mulitple foreign IDs", E_USER_WARNING);
return;
}
$fk = $this->foreignKey;
$item->$fk = $this->foreignID;
$item->write();
}
/**
* Remove an item from this relation.
* Doesn't actually remove the item, it just clears the foreign key value.
* @param $itemID The ID of the item to be removed
*/
function removeByID($itemID) {
$item = $this->byID($item);
return $this->remove($item);
}
/**
* Remove an item from this relation.
* Doesn't actually remove the item, it just clears the foreign key value.
* @param $item The DataObject to be removed
* @todo Maybe we should delete the object instead?
*/
function remove($item) {
if(!($item instanceof $this->dataClass)) throw new InvalidArgumentException("HasManyList::remove() expecting a $this->dataClass object, or ID value", E_USER_ERROR);
$fk = $this->foreignKey;
$item->$fk = null;
$item->write();
}
}