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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\elasticsearch;
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use yii\db\ActiveQueryInterface;
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use yii\db\ActiveQueryTrait;
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use yii\db\ActiveRelationTrait;
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/**
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* ActiveQuery represents a [[Query]] associated with an [[ActiveRecord]] class.
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*
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* An ActiveQuery can be a normal query or be used in a relational context.
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*
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* ActiveQuery instances are usually created by [[ActiveRecord::find()]].
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* Relational queries are created by [[ActiveRecord::hasOne()]] and [[ActiveRecord::hasMany()]].
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*
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* Normal Query
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* ------------
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*
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* ActiveQuery mainly provides the following methods to retrieve the query results:
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*
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* - [[one()]]: returns a single record populated with the first row of data.
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* - [[all()]]: returns all records based on the query results.
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* - [[count()]]: returns the number of records.
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* - [[scalar()]]: returns the value of the first column in the first row of the query result.
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* - [[column()]]: returns the value of the first column in the query result.
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* - [[exists()]]: returns a value indicating whether the query result has data or not.
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*
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* Because ActiveQuery extends from [[Query]], one can use query methods, such as [[where()]],
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* [[orderBy()]] to customize the query options.
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*
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* ActiveQuery also provides the following additional query options:
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*
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* - [[with()]]: list of relations that this query should be performed with.
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* - [[indexBy()]]: the name of the column by which the query result should be indexed.
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* - [[asArray()]]: whether to return each record as an array.
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*
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* These options can be configured using methods of the same name. For example:
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*
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* ```php
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* $customers = Customer::find()->with('orders')->asArray()->all();
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* ```
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* > NOTE: elasticsearch limits the number of records returned to 10 records by default.
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* > If you expect to get more records you should specify limit explicitly.
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*
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* Relational query
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* ----------------
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*
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* In relational context ActiveQuery represents a relation between two Active Record classes.
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*
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* Relational ActiveQuery instances are usually created by calling [[ActiveRecord::hasOne()]] and
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* [[ActiveRecord::hasMany()]]. An Active Record class declares a relation by defining
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* a getter method which calls one of the above methods and returns the created ActiveQuery object.
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*
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* A relation is specified by [[link]] which represents the association between columns
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* of different tables; and the multiplicity of the relation is indicated by [[multiple]].
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*
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* If a relation involves a pivot table, it may be specified by [[via()]].
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* This methods may only be called in a relational context. Same is true for [[inverseOf()]], which
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* marks a relation as inverse of another relation.
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*
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* > NOTE: elasticsearch limits the number of records returned by any query to 10 records by default.
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* > If you expect to get more records you should specify limit explicitly in relation definition.
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* > This is also important for relations that use [[via()]] so that if via records are limited to 10
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* > the relations records can also not be more than 10.
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*
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* @author Carsten Brandt <mail@cebe.cc>
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* @since 2.0
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*/
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class ActiveQuery extends Query implements ActiveQueryInterface
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{
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use ActiveQueryTrait;
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use ActiveRelationTrait;
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/**
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* @event Event an event that is triggered when the query is initialized via [[init()]].
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*/
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const EVENT_INIT = 'init';
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/**
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* Constructor.
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* @param array $modelClass the model class associated with this query
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* @param array $config configurations to be applied to the newly created query object
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*/
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public function __construct($modelClass, $config = [])
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{
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$this->modelClass = $modelClass;
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parent::__construct($config);
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}
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/**
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* Initializes the object.
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* This method is called at the end of the constructor. The default implementation will trigger
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* an [[EVENT_INIT]] event. If you override this method, make sure you call the parent implementation at the end
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* to ensure triggering of the event.
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*/
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public function init()
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{
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parent::init();
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$this->trigger(self::EVENT_INIT);
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}
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/**
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* Creates a DB command that can be used to execute this query.
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* @param Connection $db the DB connection used to create the DB command.
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* If null, the DB connection returned by [[modelClass]] will be used.
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* @return Command the created DB command instance.
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*/
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public function createCommand($db = null)
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{
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if ($this->primaryModel !== null) {
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// lazy loading
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if (is_array($this->via)) {
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// via relation
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/* @var $viaQuery ActiveQuery */
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list($viaName, $viaQuery) = $this->via;
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if ($viaQuery->multiple) {
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$viaModels = $viaQuery->all();
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$this->primaryModel->populateRelation($viaName, $viaModels);
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} else {
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$model = $viaQuery->one();
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$this->primaryModel->populateRelation($viaName, $model);
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$viaModels = $model === null ? [] : [$model];
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}
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$this->filterByModels($viaModels);
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} else {
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$this->filterByModels([$this->primaryModel]);
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}
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}
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/* @var $modelClass ActiveRecord */
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$modelClass = $this->modelClass;
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if ($db === null) {
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$db = $modelClass::getDb();
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}
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if ($this->type === null) {
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$this->type = $modelClass::type();
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}
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if ($this->index === null) {
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$this->index = $modelClass::index();
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$this->type = $modelClass::type();
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}
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$commandConfig = $db->getQueryBuilder()->build($this);
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return $db->createCommand($commandConfig);
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}
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/**
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* Executes query and returns all results as an array.
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* @param Connection $db the DB connection used to create the DB command.
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* If null, the DB connection returned by [[modelClass]] will be used.
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* @return array the query results. If the query results in nothing, an empty array will be returned.
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*/
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public function all($db = null)
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{
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if ($this->asArray) {
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// TODO implement with
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return parent::all($db);
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}
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$result = $this->createCommand($db)->search();
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if (empty($result['hits']['hits'])) {
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return [];
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}
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$models = $this->createModels($result['hits']['hits']);
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if (!empty($this->with)) {
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$this->findWith($this->with, $models);
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}
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foreach ($models as $model) {
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$model->afterFind();
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}
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return $models;
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}
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/**
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* Executes query and returns a single row of result.
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* @param Connection $db the DB connection used to create the DB command.
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* If null, the DB connection returned by [[modelClass]] will be used.
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* @return ActiveRecord|array|null a single row of query result. Depending on the setting of [[asArray]],
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* the query result may be either an array or an ActiveRecord object. Null will be returned
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* if the query results in nothing.
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*/
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public function one($db = null)
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{
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if (($result = parent::one($db)) === false) {
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return null;
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}
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if ($this->asArray) {
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// TODO implement with
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// /* @var $modelClass ActiveRecord */
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// $modelClass = $this->modelClass;
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// $model = $result['_source'];
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// $pk = $modelClass::primaryKey()[0];
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// if ($pk === '_id') {
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// $model['_id'] = $result['_id'];
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// }
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// $model['_score'] = $result['_score'];
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// if (!empty($this->with)) {
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// $models = [$model];
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// $this->findWith($this->with, $models);
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// $model = $models[0];
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// }
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return $result;
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} else {
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/* @var $class ActiveRecord */
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$class = $this->modelClass;
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$model = $class::instantiate($result);
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$class::populateRecord($model, $result);
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if (!empty($this->with)) {
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$models = [$model];
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$this->findWith($this->with, $models);
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$model = $models[0];
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}
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$model->afterFind();
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return $model;
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}
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}
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/**
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* @inheritdoc
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*/
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public function search($db = null, $options = [])
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{
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$result = $this->createCommand($db)->search($options);
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// TODO implement with for asArray
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if (!empty($result['hits']['hits']) && !$this->asArray) {
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$models = $this->createModels($result['hits']['hits']);
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if (!empty($this->with)) {
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$this->findWith($this->with, $models);
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}
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foreach ($models as $model) {
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$model->afterFind();
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}
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$result['hits']['hits'] = $models;
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}
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return $result;
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}
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/**
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* @inheritdoc
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*/
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public function column($field, $db = null)
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{
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if ($field == '_id') {
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$command = $this->createCommand($db);
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$command->queryParts['fields'] = [];
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$command->queryParts['_source'] = false;
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$result = $command->search();
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if (empty($result['hits']['hits'])) {
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return [];
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}
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$column = [];
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foreach ($result['hits']['hits'] as $row) {
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$column[] = $row['_id'];
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}
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return $column;
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}
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return parent::column($field, $db);
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}
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}
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