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<?php
/**
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* JoinElement class file.
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*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2012 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db\ar;
use yii\base\VectorIterator;
use yii\db\dao\Query;
use yii\db\Exception;
class JoinElement extends \yii\base\Object
{
/**
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* @var integer ID of this join element
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*/
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public $id;
/**
* @var BaseActiveQuery
*/
public $query;
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/**
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* @var JoinElement the parent element that this element needs to join with
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*/
public $parent;
/**
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* @var JoinElement[] the child elements that need to join with this element
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*/
public $children = array();
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/**
* @var JoinElement[] the child elements that have relations declared in the AR class of this element
*/
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public $relations = array();
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/**
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* @var boolean whether this element is only for join purpose. If false, data will also be populated into the AR of this element.
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*/
public $joinOnly;
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public $columnAliases = array(); // alias => original name
public $pkAlias = array(); // original name => alias
public $records;
public $relatedRecords;
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/**
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* @param integer $id
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* @param ActiveRelation|ActiveQuery $query
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* @param null|JoinElement $parent
* @param null|JoinElement $container
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*/
public function __construct($id, $query, $parent, $container)
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{
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$this->id = $id;
$this->query = $query;
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if ($parent !== null) {
$this->parent = $parent;
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$parent->children[$query->name] = $this;
$container->relations[$query->name] = $this;
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}
}
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/**
* @param array $row
* @return null|ActiveRecord
*/
public function createRecord($row)
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{
$pk = array();
foreach ($this->pkAlias as $alias) {
if (isset($row[$alias])) {
$pk[] = $row[$alias];
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} else {
return null;
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}
}
$pk = count($pk) === 1 ? $pk[0] : serialize($pk);
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// create record
// todo: asArray
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if (isset($this->records[$pk])) {
$record = $this->records[$pk];
} else {
$attributes = array();
foreach ($row as $alias => $value) {
if (isset($this->columnAliases[$alias])) {
$attributes[$this->columnAliases[$alias]] = $value;
}
}
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$modelClass = $this->query->modelClass;
$this->records[$pk] = $record = $modelClass::create($attributes);
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foreach ($this->children as $child) {
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if ($child->query->select !== false || $child->joinOnly) {
$record->initRelation($child->query);
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}
}
}
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// add related records
foreach ($this->relations as $child) {
if ($child->query->select === false || $child->joinOnly) {
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continue;
}
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$childRecord = $child->createRecord($row);
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if ($childRecord === null) {
continue;
}
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if ($child->query->hasMany) {
if ($child->query->index !== null) {
$hash = $childRecord[$child->query->index];
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} else {
$hash = serialize($childRecord->getPrimaryKey());
}
if (!isset($this->relatedRecords[$pk][$child->query->name][$hash])) {
$this->relatedRecords[$pk][$child->query->name][$hash] = true;
$record->addRelatedRecord($child->query, $childRecord);
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}
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} else {
$record->addRelatedRecord($child->query, $childRecord);
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}
}
return $record;
}
}