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<?php |
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namespace SilverStripe\ORM; |
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use InvalidArgumentException; |
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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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{ |
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/** |
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* @var string |
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*/ |
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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, $foreignKey) |
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{ |
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parent::__construct($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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{ |
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return $this->foreignKey; |
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} |
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/** |
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* @param null|int $id |
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* @return array |
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*/ |
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protected function foreignIDFilter($id = null) |
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{ |
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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) . ")" => $id); |
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} elseif ($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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{ |
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if (is_numeric($item)) { |
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$item = DataObject::get_by_id($this->dataClass, $item); |
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} elseif (!($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("HasManyList::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($foreignID)) { |
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user_error("HasManyList::add() can't be called on a list linked to mulitple foreign IDs", E_USER_WARNING); |
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return; |
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} |
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$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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{ |
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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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{ |
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if (!($item instanceof $this->dataClass)) { |
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throw new InvalidArgumentException( |
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"HasManyList::remove() expecting a $this->dataClass object, or ID", |
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E_USER_ERROR |
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); |
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} |
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// Don't remove item which doesn't belong to this list |
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$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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silverstripe /
silverstripe-framework
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