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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\mongodb;
use yii\db\ActiveQueryInterface;
use yii\db\ActiveQueryTrait;
use yii\db\ActiveRelationTrait;
/**
* ActiveQuery represents a Mongo query associated with an Active Record class.
*
* An ActiveQuery can be a normal query or be used in a relational context.
*
* ActiveQuery instances are usually created by [[ActiveRecord::find()]].
* Relational queries are created by [[ActiveRecord::hasOne()]] and [[ActiveRecord::hasMany()]].
*
* Normal Query
* ------------
*
* ActiveQuery instances are usually created by [[ActiveRecord::find()]].
*
* Because ActiveQuery extends from [[Query]], one can use query methods, such as [[where()]],
* [[orderBy()]] to customize the query options.
*
* ActiveQuery also provides the following additional query options:
*
* - [[with()]]: list of relations that this query should be performed with.
* - [[asArray()]]: whether to return each record as an array.
*
* These options can be configured using methods of the same name. For example:
*
* ```php
* $customers = Customer::find()->with('orders')->asArray()->all();
* ```
*
* Relational query
* ----------------
*
* In relational context ActiveQuery represents a relation between two Active Record classes.
*
* Relational ActiveQuery 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 ActiveQuery 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()]].
* This methods may only be called in a relational context. Same is true for [[inverseOf()]], which
* marks a relation as inverse of another relation.
*
* @property Collection $collection Collection instance. This property is read-only.
*
* @author Paul Klimov <klimov.paul@gmail.com>
* @since 2.0
*/
class ActiveQuery extends Query implements ActiveQueryInterface
{
use ActiveQueryTrait;
use ActiveRelationTrait;
/**
* Constructor.
* @param array $modelClass the model class associated with this query
* @param array $config configurations to be applied to the newly created query object
*/
public function __construct($modelClass, $config = [])
{
$this->modelClass = $modelClass;
parent::__construct($config);
}
/**
* @inheritdoc
*/
protected function buildCursor($db = null)
{
if ($this->primaryModel !== null) {
// lazy loading
if ($this->via instanceof self) {
// via pivot collection
$viaModels = $this->via->findPivotRows([$this->primaryModel]);
$this->filterByModels($viaModels);
} elseif (is_array($this->via)) {
// via relation
/* @var $viaQuery ActiveQuery */
list($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];
}
$this->filterByModels($viaModels);
} else {
$this->filterByModels([$this->primaryModel]);
}
}
return parent::buildCursor($db);
}
/**
* Executes query and returns all results as an array.
* @param Connection $db the Mongo connection used to execute the query.
* If null, the Mongo connection returned by [[modelClass]] will be used.
* @return array the query results. If the query results in nothing, an empty array will be returned.
*/
public function all($db = null)
{
$cursor = $this->buildCursor($db);
$rows = $this->fetchRows($cursor);
if (!empty($rows)) {
$models = $this->createModels($rows);
if (!empty($this->with)) {
$this->findWith($this->with, $models);
}
if (!$this->asArray) {
foreach ($models as $model) {
$model->afterFind();
}
}
return $models;
} else {
return [];
}
}
/**
* Executes query and returns a single row of result.
* @param Connection $db the Mongo connection used to execute the query.
* If null, the Mongo connection returned by [[modelClass]] will be used.
* @return ActiveRecord|array|null a single row of query result. Depending on the setting of [[asArray]],
* the query result may be either an array or an ActiveRecord object. Null will be returned
* if the query results in nothing.
*/
public function one($db = null)
{
$row = parent::one($db);
if ($row !== false) {
if ($this->asArray) {
$model = $row;
} else {
/* @var $class ActiveRecord */
$class = $this->modelClass;
$model = $class::instantiate($row);
$class::populateRecord($model, $row);
}
if (!empty($this->with)) {
$models = [$model];
$this->findWith($this->with, $models);
$model = $models[0];
}
if (!$this->asArray) {
$model->afterFind();
}
return $model;
} else {
return null;
}
}
/**
* Returns the Mongo collection for this query.
* @param Connection $db Mongo connection.
* @return Collection collection instance.
*/
public function getCollection($db = null)
{
/* @var $modelClass ActiveRecord */
$modelClass = $this->modelClass;
if ($db === null) {
$db = $modelClass::getDb();
}
if ($this->from === null) {
$this->from = $modelClass::collectionName();
}
return $db->getCollection($this->from);
}
}