92 lines
2.5 KiB
PHP
92 lines
2.5 KiB
PHP
<?php
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/**
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* Handles polymorphic relation for commentlist
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*
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* Uses elements of PolymorphicHasManyList in 3.2
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*
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* @author dmooyman
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*/
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class CommentList extends HasManyList {
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/**
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* Retrieve the name of the class this relation is filtered by
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*
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* @return string
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*/
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public function getForeignClass() {
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return $this->dataQuery->getQueryParam('Foreign.Class');
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}
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public function __construct($parentClassName) {
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parent::__construct('Comment', 'ParentID');
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// Ensure underlying DataQuery globally references the class filter
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$this->dataQuery->setQueryParam('Foreign.Class', $parentClassName);
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// For queries with multiple foreign IDs (such as that generated by
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// DataList::relation) the filter must be generalised to filter by subclasses
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$classNames = Convert::raw2sql(ClassInfo::subclassesFor($parentClassName));
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$this->dataQuery->where(sprintf(
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"\"BaseClass\" IN ('%s')", implode("', '", $classNames)
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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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*
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* @param Comment $item The comment to be added
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*/
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public function add($item) {
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// Check item given
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if(is_numeric($item)) {
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$item = Comment::get()->byID($item);
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}
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if(!($item instanceof Comment)) {
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throw new InvalidArgumentException("CommentList::add() expecting a Comment object, or ID value");
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}
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// Validate foreignID
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$foreignID = $this->getForeignID();
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if(!$foreignID || is_array($foreignID)) {
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throw new InvalidArgumentException("CommentList::add() can't be called until a single foreign ID is set");
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}
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$item->ParentID = $foreignID;
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$item->BaseClass = $this->getForeignClass();
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$item->write();
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}
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/**
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* Remove a Comment from this relation by clearing the foreign key. Does not actually delete the comment.
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*
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* @param Comment $item The Comment to be removed
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*/
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public function remove($item) {
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// Check item given
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if(is_numeric($item)) {
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$item = Comment::get()->byID($item);
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}
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if(!($item instanceof Comment)) {
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throw new InvalidArgumentException("CommentList::remove() expecting a Comment object, or ID",
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E_USER_ERROR);
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}
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// Don't remove item with unrelated class key
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$foreignClass = $this->getForeignClass();
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$classNames = ClassInfo::subclassesFor($foreignClass);
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if(!in_array($item->BaseClass, $classNames)) return;
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// Don't remove item which doesn't belong to this list
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$foreignID = $this->getForeignID();
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if( empty($foreignID)
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|| (is_array($foreignID) && in_array($item->ParentID, $foreignID))
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|| $foreignID == $item->ParentID
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) {
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$item->ParentID = null;
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$item->BaseClass = null;
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$item->write();
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}
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}
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}
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