mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-09-09 03:01:18 +02:00
Cleanup of framework's use of @package and @subpackage labels and additional of labels for classes missing packages. Moved all GridField related components to the one name. Countless spelling fixes, grammar for other comments. Link ClassName references in file headers.
270 lines
8.5 KiB
PHP
270 lines
8.5 KiB
PHP
<?php
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/**
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* Subclass of {@link DataList} representing a many_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 ManyManyList extends RelationList {
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protected $joinTable;
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protected $localKey;
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protected $foreignKey;
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protected $extraFields;
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/**
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* Create a new ManyManyList object.
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*
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* A ManyManyList object represents a list of DataObject records that correspond to a many-many
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* relationship. In addition to,
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*
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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 $joinTable The name of the table whose entries define the content of this many_many relation.
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* @param string $localKey The key in the join table that maps to the dataClass' PK.
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* @param string $foreignKey The key in the join table that maps to joined class' PK.
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* @param string $extraFields A map of field => fieldtype of extra fields on the join table.
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*
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* @example new ManyManyList('Group','Group_Members', 'GroupID', 'MemberID');
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*/
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public function __construct($dataClass, $joinTable, $localKey, $foreignKey, $extraFields = array()) {
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parent::__construct($dataClass);
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$this->joinTable = $joinTable;
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$this->localKey = $localKey;
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$this->foreignKey = $foreignKey;
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$this->extraFields = $extraFields;
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$baseClass = ClassInfo::baseDataClass($dataClass);
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// Join to the many-many join table
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$this->dataQuery->innerJoin($joinTable, "\"$joinTable\".\"$this->localKey\" = \"$baseClass\".\"ID\"");
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// Query the extra fields from the join table
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if($extraFields) $this->dataQuery->selectFromTable($joinTable, array_keys($extraFields));
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}
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/**
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* Return a filter expression for when getting the contents of the relationship for some foreign ID
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* @return string
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*/
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protected function foreignIDFilter($id = null) {
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if ($id === null) $id = $this->getForeignID();
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// Apply relation filter
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if(is_array($id)) {
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return "\"$this->joinTable\".\"$this->foreignKey\" IN ('" .
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implode("', '", array_map('Convert::raw2sql', $id)) . "')";
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} else if($id !== null){
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return "\"$this->joinTable\".\"$this->foreignKey\" = '" .
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Convert::raw2sql($id) . "'";
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}
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}
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/**
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* Return a filter expression for the join table when writing to the join table
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*
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* When writing (add, remove, removeByID), we need to filter the join table to just the relevant
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* entries. However some subclasses of ManyManyList (Member_GroupSet) modify foreignIDFilter to
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* include additional calculated entries, so we need different filters when reading and when writing
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*
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* @return string
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*/
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protected function foreignIDWriteFilter($id = null) {
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return $this->foreignIDFilter($id);
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}
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/**
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* Add an item to this many_many relationship
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* Does so by adding an entry to the joinTable.
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* @param $extraFields A map of additional columns to insert into the joinTable
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*/
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public function add($item, $extraFields = null) {
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if(is_numeric($item)) $itemID = $item;
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else if($item instanceof $this->dataClass) $itemID = $item->ID;
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else {
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throw new InvalidArgumentException("ManyManyList::add() expecting a $this->dataClass object, or ID value",
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E_USER_ERROR);
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}
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$foreignIDs = $this->getForeignID();
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$foreignFilter = $this->foreignIDWriteFilter();
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// Validate foreignID
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if(!$foreignIDs) {
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throw new Exception("ManyManyList::add() can't be called until a foreign ID is set", E_USER_WARNING);
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}
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if($foreignFilter) {
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$query = new SQLQuery("*", array("\"$this->joinTable\""));
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$query->setWhere($foreignFilter);
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$hasExisting = ($query->count() > 0);
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} else {
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$hasExisting = false;
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}
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// Insert or update
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foreach((array)$foreignIDs as $foreignID) {
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$manipulation = array();
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if($hasExisting) {
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$manipulation[$this->joinTable]['command'] = 'update';
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$manipulation[$this->joinTable]['where'] = "\"$this->joinTable\".\"$this->foreignKey\" = " .
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"'" . Convert::raw2sql($foreignID) . "'" .
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" AND \"$this->localKey\" = {$itemID}";
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} else {
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$manipulation[$this->joinTable]['command'] = 'insert';
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}
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if($extraFields) foreach($extraFields as $k => $v) {
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if(is_null($v)) $manipulation[$this->joinTable]['fields'][$k] = 'NULL';
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else $manipulation[$this->joinTable]['fields'][$k] = "'" . Convert::raw2sql($v) . "'";
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}
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$manipulation[$this->joinTable]['fields'][$this->localKey] = $itemID;
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$manipulation[$this->joinTable]['fields'][$this->foreignKey] = $foreignID;
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DB::manipulate($manipulation);
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}
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}
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/**
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* Remove the given item from this list.
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* Note that for a ManyManyList, the item is never actually deleted, only the join table is affected
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* @param $itemID The ID of the item to remove.
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*/
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public function remove($item) {
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if(!($item instanceof $this->dataClass)) {
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throw new InvalidArgumentException("ManyManyList::remove() expecting a $this->dataClass object");
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}
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return $this->removeByID($item->ID);
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}
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/**
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* Remove the given item from this list.
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* Note that for a ManyManyList, the item is never actually deleted, only the join table is affected
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* @param $itemID The item it
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*/
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public function removeByID($itemID) {
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if(!is_numeric($itemID)) throw new InvalidArgumentException("ManyManyList::removeById() expecting an ID");
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$query = new SQLQuery("*", array("\"$this->joinTable\""));
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$query->setDelete(true);
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if($filter = $this->foreignIDWriteFilter($this->getForeignID())) {
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$query->setWhere($filter);
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} else {
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user_error("Can't call ManyManyList::remove() until a foreign ID is set", E_USER_WARNING);
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}
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$query->addWhere("\"$this->localKey\" = {$itemID}");
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$query->execute();
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}
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/**
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* Remove all items from this many-many join. To remove a subset of items, filter it first.
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*/
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public function removeAll() {
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$base = ClassInfo::baseDataClass($this->dataClass());
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// Remove the join to the join table to avoid MySQL row locking issues.
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$query = $this->dataQuery();
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$query->removeFilterOn($query->getQueryParam('Foreign.Filter'));
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$query = $query->query();
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$query->setSelect("\"$base\".\"ID\"");
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$from = $query->getFrom();
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unset($from[$this->joinTable]);
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$query->setFrom($from);
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$query->setDistinct(false);
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$query->setOrderBy(null, null); // ensure any default sorting is removed, ORDER BY can break DELETE clauses
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// Use a sub-query as SQLite does not support setting delete targets in
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// joined queries.
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$delete = new SQLQuery();
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$delete->setDelete(true);
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$delete->setFrom("\"$this->joinTable\"");
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$delete->addWhere($this->foreignIDFilter());
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$delete->addWhere("\"$this->joinTable\".\"$this->localKey\" IN ({$query->sql()})");
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$delete->execute();
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}
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/**
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* Find the extra field data for a single row of the relationship
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* join table, given the known child ID.
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*
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* @todo Add tests for this / refactor it / something
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*
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* @param string $componentName The name of the component
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* @param int $itemID The ID of the child for the relationship
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* @return array Map of fieldName => fieldValue
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*/
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function getExtraData($componentName, $itemID) {
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$result = array();
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if(!is_numeric($itemID)) {
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user_error('ComponentSet::getExtraData() passed a non-numeric child ID', E_USER_ERROR);
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}
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// @todo Optimize into a single query instead of one per extra field
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if($this->extraFields) {
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foreach($this->extraFields as $fieldName => $dbFieldSpec) {
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$query = new SQLQuery("\"$fieldName\"", array("\"$this->joinTable\""));
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if($filter = $this->foreignIDWriteFilter($this->getForeignID())) {
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$query->setWhere($filter);
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} else {
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user_error("Can't call ManyManyList::getExtraData() until a foreign ID is set", E_USER_WARNING);
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}
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$query->addWhere("\"$this->localKey\" = {$itemID}");
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$result[$fieldName] = $query->execute()->value();
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}
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}
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return $result;
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}
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/**
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* Gets the join table used for the relationship.
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*
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* @return string the name of the table
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*/
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public function getJoinTable() {
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return $this->joinTable;
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}
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/**
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* Gets the key used to store the ID of the local/parent object.
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*
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* @return string the field name
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*/
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public function getLocalKey() {
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return $this->localKey;
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}
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/**
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* Gets the key used to store the ID of the foreign/child object.
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*
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* @return string the field name
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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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/**
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* Gets the extra fields included in the relationship.
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*
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* @return array a map of field names to types
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*/
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public function getExtraFields() {
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return $this->extraFields;
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}
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}
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