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<?php
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/**
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
*/
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namespace yii\db;
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use yii\base\InvalidConfigException;
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/**
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* ActiveRelation represents a relation between two Active Record classes.
*
* ActiveRelation instances are usually created by calling [[ActiveRecord::hasOne()]] and
* [[ActiveRecord::hasMany()]]. An Active Record class declares a relation by defining
* a getter method which calls one of the above methods and returns the created ActiveRelation object.
*
* A relation is specified by [[link]] which represents the association between columns
* of different tables; and the multiplicity of the relation is indicated by [[multiple]].
*
* If a relation involves a pivot table, it may be specified by [[via()]] or [[viaTable()]] method.
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*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
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class ActiveRelation extends ActiveQuery
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{
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/**
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* @var boolean whether this relation should populate all query results into AR instances.
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* If false, only the first row of the results will be retrieved.
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*/
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public $multiple;
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/**
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* @var ActiveRecord the primary model that this relation is associated with.
* This is used only in lazy loading with dynamic query options.
*/
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public $primaryModel;
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/**
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* @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
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* must be the corresponding columns from the primary table.
* Do not prefix or quote the column names as they will be done automatically by Yii.
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*/
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public $link;
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/**
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* @var array|ActiveRelation the query associated with the pivot table. Please call [[via()]]
* or [[viaTable()]] to set this property instead of directly setting it.
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*/
public $via;
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/**
* Clones internal objects.
*/
public function __clone()
{
if (is_object($this->via)) {
// make a clone of "via" object so that the same query object can be reused multiple times
$this->via = clone $this->via;
}
}
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/**
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* Specifies the relation associated with the pivot table.
* @param string $relationName the relation name. This refers to a relation declared in [[primaryModel]].
* @param callable $callable a PHP callback for customizing the relation associated with the pivot table.
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* Its signature should be `function($query)`, where `$query` is the query to be customized.
* @return static the relation object itself.
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*/
public function via($relationName, $callable = null)
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{
$relation = $this->primaryModel->getRelation($relationName);
$this->via = [$relationName, $relation];
if ($callable !== null) {
call_user_func($callable, $relation);
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}
return $this;
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}
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/**
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* Specifies the pivot table.
* @param string $tableName the name of the pivot table.
* @param array $link the link between the pivot table and the table associated with [[primaryModel]].
* The keys of the array represent the columns in the pivot table, and the values represent the columns
* in the [[primaryModel]] table.
* @param callable $callable a PHP callback for customizing the relation associated with the pivot table.
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* Its signature should be `function($query)`, where `$query` is the query to be customized.
* @return static
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*/
public function viaTable($tableName, $link, $callable = null)
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{
$relation = new ActiveRelation([
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'modelClass' => get_class($this->primaryModel),
'from' => [$tableName],
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'link' => $link,
'multiple' => true,
'asArray' => true,
]);
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$this->via = $relation;
if ($callable !== null) {
call_user_func($callable, $relation);
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}
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return $this;
}
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/**
* Creates a DB command that can be used to execute this query.
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* @param Connection $db the DB connection used to create the DB command.
* If null, the DB connection returned by [[modelClass]] will be used.
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* @return Command the created DB command instance.
*/
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public function createCommand($db = null)
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{
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if ($this->primaryModel !== null) {
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// lazy loading
if ($this->via instanceof self) {
// via pivot table
$viaModels = $this->via->findPivotRows([$this->primaryModel]);
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$this->filterByModels($viaModels);
} elseif (is_array($this->via)) {
// via relation
/** @var $viaQuery ActiveRelation */
list($viaName, $viaQuery) = $this->via;
if ($viaQuery->multiple) {
$viaModels = $viaQuery->all();
$this->primaryModel->populateRelation($viaName, $viaModels);
} else {
$model = $viaQuery->one();
$this->primaryModel->populateRelation($viaName, $model);
$viaModels = $model === null ? [] : [$model];
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}
$this->filterByModels($viaModels);
} else {
$this->filterByModels([$this->primaryModel]);
}
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}
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return parent::createCommand($db);
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}
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/**
* Finds the related records and populates them into the primary models.
* This method is internally used by [[ActiveQuery]]. Do not call it directly.
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* @param string $name the relation name
* @param array $primaryModels primary models
* @return array the related models
* @throws InvalidConfigException
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*/
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public function findWith($name, &$primaryModels)
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{
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if (!is_array($this->link)) {
throw new InvalidConfigException('Invalid link: it must be an array of key-value pairs.');
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}
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if ($this->via instanceof self) {
// via pivot table
/** @var $viaQuery ActiveRelation */
$viaQuery = $this->via;
$viaModels = $viaQuery->findPivotRows($primaryModels);
$this->filterByModels($viaModels);
} elseif (is_array($this->via)) {
// via relation
/** @var $viaQuery ActiveRelation */
list($viaName, $viaQuery) = $this->via;
$viaQuery->primaryModel = null;
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$viaModels = $viaQuery->findWith($viaName, $primaryModels);
$this->filterByModels($viaModels);
} else {
$this->filterByModels($primaryModels);
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}
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if (count($primaryModels) === 1 && !$this->multiple) {
$model = $this->one();
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foreach ($primaryModels as $i => $primaryModel) {
if ($primaryModel instanceof ActiveRecord) {
$primaryModel->populateRelation($name, $model);
} else {
$primaryModels[$i][$name] = $model;
}
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}
return [$model];
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} else {
$models = $this->all();
if (isset($viaModels, $viaQuery)) {
$buckets = $this->buildBuckets($models, $this->link, $viaModels, $viaQuery->link);
} else {
$buckets = $this->buildBuckets($models, $this->link);
}
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$link = array_values(isset($viaQuery) ? $viaQuery->link : $this->link);
foreach ($primaryModels as $i => $primaryModel) {
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$key = $this->getModelKey($primaryModel, $link);
$value = isset($buckets[$key]) ? $buckets[$key] : ($this->multiple ? [] : null);
if ($primaryModel instanceof ActiveRecord) {
$primaryModel->populateRelation($name, $value);
} else {
$primaryModels[$i][$name] = $value;
}
}
return $models;
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}
}
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/**
* @param array $models
* @param array $link
* @param array $viaModels
* @param array $viaLink
* @return array
*/
private function buildBuckets($models, $link, $viaModels = null, $viaLink = null)
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{
$buckets = [];
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$linkKeys = array_keys($link);
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foreach ($models as $i => $model) {
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$key = $this->getModelKey($model, $linkKeys);
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if ($this->indexBy !== null) {
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$buckets[$key][$i] = $model;
} else {
$buckets[$key][] = $model;
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}
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}
if ($viaModels !== null) {
$viaBuckets = [];
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$viaLinkKeys = array_keys($viaLink);
$linkValues = array_values($link);
foreach ($viaModels as $viaModel) {
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$key1 = $this->getModelKey($viaModel, $viaLinkKeys);
$key2 = $this->getModelKey($viaModel, $linkValues);
if (isset($buckets[$key2])) {
foreach ($buckets[$key2] as $i => $bucket) {
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if ($this->indexBy !== null) {
$viaBuckets[$key1][$i] = $bucket;
} else {
$viaBuckets[$key1][] = $bucket;
}
}
}
}
$buckets = $viaBuckets;
}
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if (!$this->multiple) {
foreach ($buckets as $i => $bucket) {
$buckets[$i] = reset($bucket);
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}
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}
return $buckets;
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}
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/**
* @param ActiveRecord|array $model
* @param array $attributes
* @return string
*/
private function getModelKey($model, $attributes)
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{
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if (count($attributes) > 1) {
$key = [];
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foreach ($attributes as $attribute) {
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$key[] = $model[$attribute];
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}
return serialize($key);
} else {
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$attribute = reset($attributes);
return $model[$attribute];
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}
}
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/**
* @param array $models
*/
private function filterByModels($models)
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{
$attributes = array_keys($this->link);
$values = [];
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if (count($attributes) === 1) {
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// single key
$attribute = reset($this->link);
foreach ($models as $model) {
if (($value = $model[$attribute]) !== null) {
$values[] = $value;
}
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}
} else {
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// composite keys
foreach ($models as $model) {
$v = [];
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foreach ($this->link as $attribute => $link) {
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$v[$attribute] = $model[$link];
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}
$values[] = $v;
}
}
$this->andWhere(['in', $attributes, array_unique($values, SORT_REGULAR)]);
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}
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/**
* @param ActiveRecord[] $primaryModels
* @return array
*/
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private function findPivotRows($primaryModels)
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{
if (empty($primaryModels)) {
return [];
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}
$this->filterByModels($primaryModels);
/** @var $primaryModel ActiveRecord */
$primaryModel = reset($primaryModels);
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$db = $primaryModel->getDb();
list ($sql, $params) = $db->getQueryBuilder()->build($this);
return $db->createCommand($sql, $params)->queryAll();
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}
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}