86 lines
2.6 KiB
PHP
86 lines
2.6 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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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 $dataClass The class of the DataObjects that this will list.
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* @param $relationFilters A map of key => value filters that define which records
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* in the $dataClass table actually belong to this relationship.
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*/
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function __construct($dataClass, $foreignKey) {
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parent::__construct($dataClass);
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$this->foreignKey = $foreignKey;
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}
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protected function foreignIDFilter() {
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// Apply relation filter
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if(is_array($this->foreignID)) {
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return "\"$this->foreignKey\" IN ('" .
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implode("', '", array_map('Convert::raw2sql', $this->foreignID)) . "')";
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} else if($this->foreignID){
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return "\"$this->foreignKey\" = '" .
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Convert::raw2sql($this->foreignID) . "'";
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}
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}
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/**
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* Adds the item to this relation.
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* It does so by setting the relationFilters.
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* @param $item The DataObject to be added, or its ID
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*/
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function add($item) {
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if(is_numeric($item)) $item = DataObject::get_by_id($this->dataClass, $item);
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else if(!($item instanceof $this->dataClass)) user_eror("HasManyList::add() expecting a $this->dataClass object, or ID value", E_USER_ERROR);
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// Validate foreignID
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if(!$this->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($this->foreignID)) {
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user_error("ManyManyList::add() can't be called on a list linked to mulitple foreign IDs", E_USER_WARNING);
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return;
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}
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$fk = $this->foreignKey;
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$item->$fk = $this->foreignID;
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$item->write();
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}
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/**
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* Remove an item from this relation.
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* Doesn't actually remove the item, it just clears the foreign key value.
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* @param $itemID The ID of the item to be removed
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*/
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function removeByID($itemID) {
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$item = $this->byID($item);
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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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* @param $item The DataObject to be removed
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* @todo Maybe we should delete the object instead?
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*/
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function remove($item) {
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if(!($item instanceof $this->dataClass)) throw new InvalidArgumentException("HasManyList::remove() expecting a $this->dataClass object, or ID value", E_USER_ERROR);
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$fk = $this->foreignKey;
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$item->$fk = null;
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$item->write();
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}
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}
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