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494 lines
18 KiB
PHP
494 lines
18 KiB
PHP
<?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\db;
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use yii\base\InvalidConfigException;
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use yii\base\InvalidParamException;
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/**
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* ActiveRelationTrait implements the common methods and properties for active record relational queries.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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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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* @method ActiveRelationTrait one()
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* @method ActiveRelationTrait[] all()
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* @property ActiveRecord $modelClass
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*/
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trait ActiveRelationTrait
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{
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/**
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* @var boolean whether this query represents a relation to more than one record.
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* This property is only used in relational context. If true, this relation will
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* populate all query results into AR instances using [[Query::all()|all()]].
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* If false, only the first row of the results will be retrieved using [[Query::one()|one()]].
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*/
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public $multiple;
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/**
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* @var ActiveRecord the primary model of a relational query.
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* This is used only in lazy loading with dynamic query options.
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*/
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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 a relation.
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* 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.
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* Do not prefix or quote the column names as this will be done automatically by Yii.
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* This property is only used in relational context.
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*/
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public $link;
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/**
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* @var array|object the query associated with the pivot table. Please call [[via()]]
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* to set this property instead of directly setting it.
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* This property is only used in relational context.
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* @see via()
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*/
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public $via;
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/**
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* @var string the name of the relation that is the inverse of this relation.
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* For example, an order has a customer, which means the inverse of the "customer" relation
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* is the "orders", and the inverse of the "orders" relation is the "customer".
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* If this property is set, the primary record(s) will be referenced through the specified relation.
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* For example, `$customer->orders[0]->customer` and `$customer` will be the same object,
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* and accessing the customer of an order will not trigger new DB query.
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* This property is only used in relational context.
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* @see inverseOf()
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*/
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public $inverseOf;
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/**
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* Clones internal objects.
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*/
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public function __clone()
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{
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parent::__clone();
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// make a clone of "via" object so that the same query object can be reused multiple times
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if (is_object($this->via)) {
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$this->via = clone $this->via;
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} elseif (is_array($this->via)) {
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$this->via = [$this->via[0], clone $this->via[1]];
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}
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}
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/**
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* Specifies the relation associated with the pivot table.
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*
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* Use this method to specify a pivot record/table when declaring a relation in the [[ActiveRecord]] class:
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*
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* ```php
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* public function getOrders()
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* {
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* return $this->hasOne(Order::className(), ['id' => 'order_id']);
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* }
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*
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* public function getOrderItems()
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* {
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* return $this->hasMany(Item::className(), ['id' => 'item_id'])
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* ->via('orders');
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* }
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* ```
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*
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* @param string $relationName the relation name. This refers to a relation declared in [[primaryModel]].
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* @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 `$query` is the query to be customized.
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* @return static the relation object itself.
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*/
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public function via($relationName, callable $callable = null)
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{
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$relation = $this->primaryModel->getRelation($relationName);
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$this->via = [$relationName, $relation];
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if ($callable !== null) {
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call_user_func($callable, $relation);
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}
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return $this;
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}
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/**
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* Sets the name of the relation that is the inverse of this relation.
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* For example, an order has a customer, which means the inverse of the "customer" relation
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* is the "orders", and the inverse of the "orders" relation is the "customer".
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* If this property is set, the primary record(s) will be referenced through the specified relation.
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* For example, `$customer->orders[0]->customer` and `$customer` will be the same object,
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* and accessing the customer of an order will not trigger a new DB query.
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*
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* Use this method when declaring a relation in the [[ActiveRecord]] class:
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*
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* ```php
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* public function getOrders()
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* {
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* return $this->hasMany(Order::className(), ['customer_id' => 'id'])->inverseOf('customer');
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* }
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* ```
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*
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* @param string $relationName the name of the relation that is the inverse of this relation.
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* @return static the relation object itself.
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*/
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public function inverseOf($relationName)
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{
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$this->inverseOf = $relationName;
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return $this;
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}
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/**
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* Finds the related records for the specified primary record.
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* This method is invoked when a relation of an ActiveRecord is being accessed in a lazy fashion.
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* @param string $name the relation name
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* @param ActiveRecordInterface|BaseActiveRecord $model the primary model
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* @return mixed the related record(s)
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* @throws InvalidParamException if the relation is invalid
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*/
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public function findFor($name, $model)
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{
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if (method_exists($model, 'get' . $name)) {
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$method = new \ReflectionMethod($model, 'get' . $name);
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$realName = lcfirst(substr($method->getName(), 3));
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if ($realName !== $name) {
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throw new InvalidParamException('Relation names are case sensitive. ' . get_class($model) . " has a relation named \"$realName\" instead of \"$name\".");
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}
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}
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$related = $this->multiple ? $this->all() : $this->one();
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if ($this->inverseOf === null || empty($related)) {
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return $related;
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}
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$inverseRelation = (new $this->modelClass)->getRelation($this->inverseOf);
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if ($this->multiple) {
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foreach ($related as $i => $relatedModel) {
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if ($relatedModel instanceof ActiveRecordInterface) {
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$relatedModel->populateRelation($this->inverseOf, $inverseRelation->multiple ? [$model] : $model);
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} else {
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$related[$i][$this->inverseOf] = $inverseRelation->multiple ? [$model] : $model;
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}
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}
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} else {
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if ($related instanceof ActiveRecordInterface) {
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$related->populateRelation($this->inverseOf, $inverseRelation->multiple ? [$model] : $model);
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} else {
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$related[$this->inverseOf] = $inverseRelation->multiple ? [$model] : $model;
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}
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}
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return $related;
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}
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/**
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* Finds the related records and populates them into the primary models.
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* @param string $name the relation name
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* @param array $primaryModels primary models
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* @return array the related models
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* @throws InvalidConfigException if [[link]] is invalid
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*/
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public function populateRelation($name, &$primaryModels)
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{
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if (!is_array($this->link)) {
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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) {
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// via pivot table
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/* @var $viaQuery ActiveRelationTrait */
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$viaQuery = $this->via;
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$viaModels = $viaQuery->findPivotRows($primaryModels);
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$this->filterByModels($viaModels);
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} elseif (is_array($this->via)) {
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// via relation
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/* @var $viaQuery ActiveRelationTrait|ActiveQueryTrait */
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list($viaName, $viaQuery) = $this->via;
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if ($viaQuery->asArray === null) {
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// inherit asArray from primary query
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$viaQuery->asArray($this->asArray);
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}
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$viaQuery->primaryModel = null;
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$viaModels = $viaQuery->populateRelation($viaName, $primaryModels);
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$this->filterByModels($viaModels);
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} else {
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$this->filterByModels($primaryModels);
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}
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if (count($primaryModels) === 1 && !$this->multiple) {
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$model = $this->one();
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foreach ($primaryModels as $i => $primaryModel) {
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if ($primaryModel instanceof ActiveRecordInterface) {
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$primaryModel->populateRelation($name, $model);
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} else {
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$primaryModels[$i][$name] = $model;
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}
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if ($this->inverseOf !== null) {
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$this->populateInverseRelation($primaryModels, [$model], $name, $this->inverseOf);
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}
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}
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return [$model];
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} else {
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$models = $this->all();
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if (isset($viaModels, $viaQuery)) {
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$buckets = $this->buildBuckets($models, $this->link, $viaModels, $viaQuery->link);
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} else {
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$buckets = $this->buildBuckets($models, $this->link);
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}
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$link = array_values(isset($viaQuery) ? $viaQuery->link : $this->link);
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foreach ($primaryModels as $i => $primaryModel) {
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if ($this->multiple && count($link) == 1 && is_array($keys = $primaryModel[reset($link)])) {
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$value = [];
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foreach ($keys as $key) {
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if (isset($buckets[$key])) {
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if ($this->indexBy !== null) {
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// if indexBy is set, array_merge will cause renumbering of numeric array
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foreach($buckets[$key] as $bucketKey => $bucketValue) {
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$value[$bucketKey] = $bucketValue;
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}
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} else {
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$value = array_merge($value, $buckets[$key]);
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}
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}
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}
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} else {
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$key = $this->getModelKey($primaryModel, $link);
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$value = isset($buckets[$key]) ? $buckets[$key] : ($this->multiple ? [] : null);
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}
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if ($primaryModel instanceof ActiveRecordInterface) {
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$primaryModel->populateRelation($name, $value);
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} else {
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$primaryModels[$i][$name] = $value;
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}
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}
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if ($this->inverseOf !== null) {
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$this->populateInverseRelation($primaryModels, $models, $name, $this->inverseOf);
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}
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return $models;
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}
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}
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/**
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* @param ActiveRecordInterface[] $primaryModels primary models
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* @param ActiveRecordInterface[] $models models
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* @param string $primaryName the primary relation name
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* @param string $name the relation name
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*/
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private function populateInverseRelation(&$primaryModels, $models, $primaryName, $name)
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{
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if (empty($models) || empty($primaryModels)) {
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return;
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}
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$model = reset($models);
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/* @var $relation ActiveQueryInterface|ActiveQuery */
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$relation = $model instanceof ActiveRecordInterface ? $model->getRelation($name) : (new $this->modelClass)->getRelation($name);
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if ($relation->multiple) {
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$buckets = $this->buildBuckets($primaryModels, $relation->link, null, null, false);
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if ($model instanceof ActiveRecordInterface) {
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foreach ($models as $model) {
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$key = $this->getModelKey($model, $relation->link);
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$model->populateRelation($name, isset($buckets[$key]) ? $buckets[$key] : []);
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}
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} else {
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foreach ($primaryModels as $i => $primaryModel) {
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if ($this->multiple) {
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foreach ($primaryModel as $j => $m) {
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$key = $this->getModelKey($m, $relation->link);
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$primaryModels[$i][$j][$name] = isset($buckets[$key]) ? $buckets[$key] : [];
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}
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} elseif (!empty($primaryModel[$primaryName])) {
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$key = $this->getModelKey($primaryModel[$primaryName], $relation->link);
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$primaryModels[$i][$primaryName][$name] = isset($buckets[$key]) ? $buckets[$key] : [];
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}
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}
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}
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} else {
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if ($this->multiple) {
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foreach ($primaryModels as $i => $primaryModel) {
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foreach ($primaryModel[$primaryName] as $j => $m) {
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if ($m instanceof ActiveRecordInterface) {
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$m->populateRelation($name, $primaryModel);
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} else {
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$primaryModels[$i][$primaryName][$j][$name] = $primaryModel;
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}
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}
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}
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} else {
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foreach ($primaryModels as $i => $primaryModel) {
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if ($primaryModels[$i][$primaryName] instanceof ActiveRecordInterface) {
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$primaryModels[$i][$primaryName]->populateRelation($name, $primaryModel);
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} elseif (!empty($primaryModels[$i][$primaryName])) {
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$primaryModels[$i][$primaryName][$name] = $primaryModel;
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}
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}
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}
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}
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}
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/**
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* @param array $models
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* @param array $link
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* @param array $viaModels
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* @param array $viaLink
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* @param boolean $checkMultiple
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* @return array
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*/
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private function buildBuckets($models, $link, $viaModels = null, $viaLink = null, $checkMultiple = true)
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{
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if ($viaModels !== null) {
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$map = [];
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$viaLinkKeys = array_keys($viaLink);
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$linkValues = array_values($link);
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foreach ($viaModels as $viaModel) {
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$key1 = $this->getModelKey($viaModel, $viaLinkKeys);
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$key2 = $this->getModelKey($viaModel, $linkValues);
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$map[$key2][$key1] = true;
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}
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}
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$buckets = [];
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$linkKeys = array_keys($link);
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if (isset($map)) {
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foreach ($models as $i => $model) {
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$key = $this->getModelKey($model, $linkKeys);
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if (isset($map[$key])) {
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foreach (array_keys($map[$key]) as $key2) {
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if ($this->indexBy !== null) {
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$buckets[$key2][$i] = $model;
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} else {
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$buckets[$key2][] = $model;
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}
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}
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}
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}
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} else {
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foreach ($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] = $model;
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} else {
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$buckets[$key][] = $model;
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}
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}
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}
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if ($checkMultiple && !$this->multiple) {
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foreach ($buckets as $i => $bucket) {
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$buckets[$i] = reset($bucket);
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}
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}
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return $buckets;
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}
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/**
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* @param array $attributes the attributes to prefix
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* @return array
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*/
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private function prefixKeyColumns($attributes)
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{
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if ($this instanceof ActiveQuery && (!empty($this->join) || !empty($this->joinWith))) {
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if (empty($this->from)) {
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/* @var $modelClass ActiveRecord */
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$modelClass = $this->modelClass;
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$alias = $modelClass::tableName();
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} else {
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foreach ($this->from as $alias => $table) {
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if (!is_string($alias)) {
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$alias = $table;
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}
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break;
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}
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}
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if (isset($alias)) {
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foreach ($attributes as $i => $attribute) {
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$attributes[$i] = "$alias.$attribute";
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}
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}
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}
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return $attributes;
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}
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/**
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* @param array $models
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*/
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private function filterByModels($models)
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{
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$attributes = array_keys($this->link);
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$attributes = $this->prefixKeyColumns($attributes);
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$values = [];
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if (count($attributes) === 1) {
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// single key
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$attribute = reset($this->link);
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foreach ($models as $model) {
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if (($value = $model[$attribute]) !== null) {
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if (is_array($value)) {
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$values = array_merge($values, $value);
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} else {
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$values[] = $value;
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}
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}
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}
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} else {
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// composite keys
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foreach ($models as $model) {
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$v = [];
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foreach ($this->link as $attribute => $link) {
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$v[$attribute] = $model[$link];
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}
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$values[] = $v;
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}
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}
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$this->andWhere(['in', $attributes, array_unique($values, SORT_REGULAR)]);
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}
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/**
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* @param ActiveRecord|array $model
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* @param array $attributes
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* @return string
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*/
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private function getModelKey($model, $attributes)
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{
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if (count($attributes) > 1) {
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$key = [];
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foreach ($attributes as $attribute) {
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$key[] = $model[$attribute];
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}
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return serialize($key);
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} else {
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$attribute = reset($attributes);
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$key = $model[$attribute];
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return is_scalar($key) ? $key : serialize($key);
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}
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}
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/**
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* @param array $primaryModels either array of AR instances or arrays
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* @return array
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*/
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private function findPivotRows($primaryModels)
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{
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if (empty($primaryModels)) {
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return [];
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}
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$this->filterByModels($primaryModels);
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/* @var $primaryModel ActiveRecord */
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$primaryModel = reset($primaryModels);
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if (!$primaryModel instanceof ActiveRecordInterface) {
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// when primaryModels are array of arrays (asArray case)
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$primaryModel = new $this->modelClass;
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}
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return $this->asArray()->all($primaryModel->getDb());
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}
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}
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