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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db;
use yii\base\InvalidConfigException;
/**
* ActiveRelationTrait implements the common methods and properties for active record relation classes.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Carsten Brandt <mail@cebe.cc>
* @since 2.0
*/
trait ActiveRelationTrait
{
/**
* @var boolean whether this relation should populate all query results into AR instances.
* If false, only the first row of the results will be retrieved.
*/
public $multiple;
/**
* @var ActiveRecord the primary model that this relation is associated with.
* This is used only in lazy loading with dynamic query options.
*/
public $primaryModel;
/**
* @var array the columns of the primary and foreign tables that establish the relation.
* The array keys must be columns of the table for this relation, and the array values
* must be the corresponding columns from the primary table.
* Do not prefix or quote the column names as this will be done automatically by Yii.
*/
public $link;
/**
* @var array the query associated with the pivot table. Please call [[via()]]
* to set this property instead of directly setting it.
*/
public $via;
/**
* Clones internal objects.
*/
public function __clone()
{
// make a clone of "via" object so that the same query object can be reused multiple times
if (is_object($this->via)) {
$this->via = clone $this->via;
} elseif (is_array($this->via)) {
$this->via = [$this->via[0], clone $this->via[1]];
}
}
/**
* Specifies the relation associated with the pivot table.
* @param string $relationName the relation name. This refers to a relation declared in [[primaryModel]].
* @param callable $callable a PHP callback for customizing the relation associated with the pivot table.
* Its signature should be `function($query)`, where `$query` is the query to be customized.
* @return static the relation object itself.
*/
public function via($relationName, $callable = null)
{
$relation = $this->primaryModel->getRelation($relationName);
$this->via = [$relationName, $relation];
if ($callable !== null) {
call_user_func($callable, $relation);
}
return $this;
}
/**
* Finds the related records and populates them into the primary models.
* @param string $name the relation name
* @param array $primaryModels primary models
* @return array the related models
* @throws InvalidConfigException if [[link]] is invalid
*/
public function populateRelation($name, &$primaryModels)
{
if (!is_array($this->link)) {
throw new InvalidConfigException('Invalid link: it must be an array of key-value pairs.');
}
if ($this->via instanceof self) {
// via pivot table
/** @var ActiveRelationTrait $viaQuery */
$viaQuery = $this->via;
$viaModels = $viaQuery->findPivotRows($primaryModels);
$this->filterByModels($viaModels);
} elseif (is_array($this->via)) {
// via relation
/** @var ActiveRelationTrait $viaQuery */
list($viaName, $viaQuery) = $this->via;
$viaQuery->primaryModel = null;
$viaModels = $viaQuery->populateRelation($viaName, $primaryModels);
$this->filterByModels($viaModels);
} else {
$this->filterByModels($primaryModels);
}
if (count($primaryModels) === 1 && !$this->multiple) {
$model = $this->one();
foreach ($primaryModels as $i => $primaryModel) {
if ($primaryModel instanceof ActiveRecordInterface) {
$primaryModel->populateRelation($name, $model);
} else {
$primaryModels[$i][$name] = $model;
}
}
return [$model];
} else {
$models = $this->all();
if (isset($viaModels, $viaQuery)) {
$buckets = $this->buildBuckets($models, $this->link, $viaModels, $viaQuery->link);
} else {
$buckets = $this->buildBuckets($models, $this->link);
}
$link = array_values(isset($viaQuery) ? $viaQuery->link : $this->link);
foreach ($primaryModels as $i => $primaryModel) {
$key = $this->getModelKey($primaryModel, $link);
$value = isset($buckets[$key]) ? $buckets[$key] : ($this->multiple ? [] : null);
if ($primaryModel instanceof ActiveRecordInterface) {
$primaryModel->populateRelation($name, $value);
} else {
$primaryModels[$i][$name] = $value;
}
}
return $models;
}
}
/**
* @param array $models
* @param array $link
* @param array $viaModels
* @param array $viaLink
* @return array
*/
private function buildBuckets($models, $link, $viaModels = null, $viaLink = null)
{
if ($viaModels !== null) {
$map = [];
$viaLinkKeys = array_keys($viaLink);
$linkValues = array_values($link);
foreach ($viaModels as $viaModel) {
$key1 = $this->getModelKey($viaModel, $viaLinkKeys);
$key2 = $this->getModelKey($viaModel, $linkValues);
$map[$key2][$key1] = true;
}
}
$buckets = [];
$linkKeys = array_keys($link);
if (isset($map)) {
foreach ($models as $i => $model) {
$key = $this->getModelKey($model, $linkKeys);
if (isset($map[$key])) {
foreach (array_keys($map[$key]) as $key2) {
if ($this->indexBy !== null) {
$buckets[$key2][$i] = $model;
} else {
$buckets[$key2][] = $model;
}
}
}
}
} else {
foreach ($models as $i => $model) {
$key = $this->getModelKey($model, $linkKeys);
if ($this->indexBy !== null) {
$buckets[$key][$i] = $model;
} else {
$buckets[$key][] = $model;
}
}
}
if (!$this->multiple) {
foreach ($buckets as $i => $bucket) {
$buckets[$i] = reset($bucket);
}
}
return $buckets;
}
/**
* @param array $models
*/
private function filterByModels($models)
{
$attributes = array_keys($this->link);
$values = [];
if (count($attributes) === 1) {
// single key
$attribute = reset($this->link);
foreach ($models as $model) {
if (($value = $model[$attribute]) !== null) {
$values[] = $value;
}
}
} else {
// composite keys
foreach ($models as $model) {
$v = [];
foreach ($this->link as $attribute => $link) {
$v[$attribute] = $model[$link];
}
$values[] = $v;
}
}
$this->andWhere(['in', $attributes, array_unique($values, SORT_REGULAR)]);
}
/**
* @param ActiveRecord|array $model
* @param array $attributes
* @return string
*/
private function getModelKey($model, $attributes)
{
if (count($attributes) > 1) {
$key = [];
foreach ($attributes as $attribute) {
$key[] = $model[$attribute];
}
return serialize($key);
} else {
$attribute = reset($attributes);
$key = $model[$attribute];
return is_scalar($key) ? $key : serialize($key);
}
}
/**
* @param array $primaryModels either array of AR instances or arrays
* @return array
*/
private function findPivotRows($primaryModels)
{
if (empty($primaryModels)) {
return [];
}
$this->filterByModels($primaryModels);
/** @var ActiveRecord $primaryModel */
$primaryModel = reset($primaryModels);
if (!$primaryModel instanceof ActiveRecordInterface) {
// when primaryModels are array of arrays (asArray case)
$primaryModel = new $this->modelClass;
}
return $this->asArray()->all($primaryModel->getDb());
}
}