mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
423 lines
12 KiB
PHP
423 lines
12 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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/**
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* @var string $joinTable
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*/
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protected $joinTable;
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/**
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* @var string $localKey
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*/
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protected $localKey;
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/**
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* @var string $foreignKey
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*/
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protected $foreignKey;
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/**
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* @var array $extraFields
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*/
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protected $extraFields;
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/**
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* @var array $_compositeExtraFields
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*/
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protected $_compositeExtraFields = array();
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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 {@link DataObject} records
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* that correspond to a many-many relationship.
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*
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* Generation of the appropriate record set is left up to the caller, using
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* the normal {@link DataList} methods. Addition arguments are used to
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* support {@@link add()} 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 = $extraFields;
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$this->linkJoinTable();
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}
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/**
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* Setup the join between this dataobject and the necessary mapping table
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*/
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protected function linkJoinTable() {
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// Join to the many-many join table
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$baseClass = ClassInfo::baseDataClass($this->dataClass);
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$this->dataQuery->innerJoin($this->joinTable, "\"{$this->joinTable}\".\"{$this->localKey}\" = \"{$baseClass}\".\"ID\"");
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// Add the extra fields to the query
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if($this->extraFields) {
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$this->appendExtraFieldsToQuery();
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}
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}
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/**
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* Adds the many_many_extraFields to the select of the underlying
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* {@link DataQuery}.
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*
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* @return void
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*/
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protected function appendExtraFieldsToQuery() {
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$finalized = array();
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foreach($this->extraFields as $field => $spec) {
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$obj = Object::create_from_string($spec);
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if($obj instanceof CompositeDBField) {
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$this->_compositeExtraFields[$field] = array();
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// append the composite field names to the select
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foreach($obj->compositeDatabaseFields() as $subField => $subSpec) {
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$col = $field . $subField;
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$finalized[] = $col;
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// cache
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$this->_compositeExtraFields[$field][] = $subField;
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}
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} else {
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$finalized[] = $field;
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}
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}
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$this->dataQuery->selectFromTable($this->joinTable, $finalized);
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}
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/**
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* Create a DataObject from the given SQL row.
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*
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* @param array $row
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* @return DataObject
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*/
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protected function createDataObject($row) {
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// remove any composed fields
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$add = array();
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if($this->_compositeExtraFields) {
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foreach($this->_compositeExtraFields as $fieldName => $composed) {
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// convert joined extra fields into their composite field types.
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$value = array();
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foreach($composed as $subField => $subSpec) {
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if(isset($row[$fieldName . $subSpec])) {
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$value[$subSpec] = $row[$fieldName . $subSpec];
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// don't duplicate data in the record
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unset($row[$fieldName . $subSpec]);
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}
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}
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$obj = Object::create_from_string($this->extraFields[$fieldName], $fieldName);
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$obj->setValue($value, null, false);
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$add[$fieldName] = $obj;
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}
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}
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$dataObject = parent::createDataObject($row);
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foreach($add as $fieldName => $obj) {
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$dataObject->$fieldName = $obj;
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}
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return $dataObject;
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}
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/**
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* Return a filter expression for when getting the contents of the
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* relationship for some foreign ID
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*
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* @param int $id
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*
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* @return string
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*/
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protected function foreignIDFilter($id = null) {
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if ($id === null) {
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$id = $this->getForeignID();
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}
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// Apply relation filter
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$key = "\"{$this->joinTable}\".\"{$this->foreignKey}\"";
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if(is_array($id)) {
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return array("$key IN (".DB::placeholders($id).")" => $id);
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} else if($id !== null){
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return array($key => $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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* @param array|integer $id (optional) An ID or an array of IDs - if not provided, will use the current ids
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* as per getForeignID
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* @return array Condition In array(SQL => parameters format)
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*/
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protected function foreignIDWriteFilter($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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*
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* @param mixed $item
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* @param array $extraFields A map of additional columns to insert into the joinTable.
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* Column names should be ANSI quoted.
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*/
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public function add($item, $extraFields = array()) {
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// Ensure nulls or empty strings are correctly treated as empty arrays
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if(empty($extraFields)) $extraFields = array();
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// Determine ID of new record
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if(is_numeric($item)) {
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$itemID = $item;
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} elseif($item instanceof $this->dataClass) {
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$itemID = $item->ID;
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} else {
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throw new InvalidArgumentException("ManyManyList::add() expecting a $this->dataClass object, or ID value",
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E_USER_ERROR);
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}
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// Validate foreignID
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$foreignIDs = $this->getForeignID();
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if(empty($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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// Apply this item to each given foreign ID record
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if(!is_array($foreignIDs)) $foreignIDs = array($foreignIDs);
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foreach($foreignIDs as $foreignID) {
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// Check for existing records for this item
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if($foreignFilter = $this->foreignIDWriteFilter($foreignID)) {
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// With the current query, simply add the foreign and local conditions
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// The query can be a bit odd, especially if custom relation classes
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// don't join expected tables (@see Member_GroupSet for example).
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$query = new SQLSelect("*", "\"{$this->joinTable}\"");
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$query->addWhere($foreignFilter);
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$query->addWhere(array(
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"\"{$this->joinTable}\".\"{$this->localKey}\"" => $itemID
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));
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$hasExisting = ($query->count() > 0);
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} else {
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$hasExisting = false;
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}
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$manipulation = array();
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if($hasExisting) {
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$manipulation[$this->joinTable]['command'] = 'update';
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$manipulation[$this->joinTable]['where'] = array(
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"\"{$this->joinTable}\".\"{$this->foreignKey}\"" => $foreignID,
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"\"{$this->joinTable}\".\"{$this->localKey}\"" => $itemID
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);
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} else {
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$manipulation[$this->joinTable]['command'] = 'insert';
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}
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if($extraFields) {
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foreach($extraFields as $fieldName => $fieldValue) {
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if(is_null($fieldValue)) {
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$manipulation[$this->joinTable]['fields'][$fieldName] = null;
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} elseif($fieldValue instanceof DBField) {
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// rely on writeToManipulation to manage the changes
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// required for this field.
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$working = array('fields' => array());
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// create a new instance of the field so we can
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// modify the field name to the correct version.
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$field = DBField::create_field(get_class($fieldValue), $fieldValue);
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$field->setName($fieldName);
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$field->writeToManipulation($working);
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foreach($working['fields'] as $extraName => $extraValue) {
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$manipulation[$this->joinTable]['fields'][$extraName] = $extraValue;
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}
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} else {
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$manipulation[$this->joinTable]['fields'][$fieldName] = $fieldValue;
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}
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}
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}
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$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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*
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* Note that for a ManyManyList, the item is never actually deleted, only
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* the join table is affected.
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*
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* @param DataObject $item
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*/
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public function remove($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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*
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* Note that for a ManyManyList, the item is never actually deleted, only
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* the join table is affected
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*
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* @param int $itemID The item ID
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*/
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public function removeByID($itemID) {
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if(!is_numeric($itemID)) throw new InvalidArgumentException("ManyManyList::removeById() expecting an ID");
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$query = new SQLDelete("\"{$this->joinTable}\"");
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if($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::remove() until a foreign ID is set", E_USER_WARNING);
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}
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$query->addWhere(array("\"{$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,
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* filter it first.
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*
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* @return void
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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 = $this->dataQuery();
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$foreignFilter = $query->getQueryParam('Foreign.Filter');
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$query->removeFilterOn($foreignFilter);
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$selectQuery = $query->query();
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$selectQuery->setSelect("\"{$base}\".\"ID\"");
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$from = $selectQuery->getFrom();
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unset($from[$this->joinTable]);
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$selectQuery->setFrom($from);
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$selectQuery->setOrderBy(); // ORDER BY in subselects breaks MS SQL Server and is not necessary here
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$selectQuery->setDistinct(false);
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// Use a sub-query as SQLite does not support setting delete targets in
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// joined queries.
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$delete = new SQLDelete();
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$delete->setFrom("\"{$this->joinTable}\"");
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$delete->addWhere($this->foreignIDFilter());
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$subSelect = $selectQuery->sql($parameters);
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$delete->addWhere(array(
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"\"{$this->joinTable}\".\"{$this->localKey}\" IN ($subSelect)" => $parameters
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));
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$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 join
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* table, given the known child ID.
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*
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* @param string $componentName The name of the component
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* @param int $itemID The ID of the child for the relationship
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*
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* @return array Map of fieldName => fieldValue
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*/
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public function getExtraData($componentName, $itemID) {
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$result = array();
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if(!is_numeric($itemID)) {
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user_error('ComponentSet::getExtraData() passed a non-numeric child ID', E_USER_ERROR);
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}
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if($this->extraFields) {
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$cleanExtraFields = array();
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foreach ($this->extraFields as $fieldName => $dbFieldSpec) {
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$cleanExtraFields[] = "\"{$fieldName}\"";
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}
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$query = new SQLSelect($cleanExtraFields, "\"{$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}\" = {$itemID}");
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$queryResult = $query->execute()->current();
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foreach ($queryResult as $fieldName => $value) {
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$result[$fieldName] = $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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