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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\db; |
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/** |
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* ActiveQueryTrait implements the common methods and properties for active record query classes. |
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* |
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* @author Qiang Xue <[email protected]> |
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* @author Carsten Brandt <[email protected]> |
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* @since 2.0 |
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*/ |
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trait ActiveQueryTrait |
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{ |
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/** |
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* @var string the name of the ActiveRecord class. |
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*/ |
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public $modelClass; |
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/** |
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* @var array a list of relations that this query should be performed with |
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*/ |
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public $with; |
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/** |
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* @var boolean whether to return each record as an array. If false (default), an object |
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* of [[modelClass]] will be created to represent each record. |
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*/ |
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public $asArray; |
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/** |
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* @var string collection class to be instantiated and filled with results. |
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* @since 2.0.10 |
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*/ |
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public $collectionClass; |
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/** |
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* Sets the [[asArray]] property. |
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* @param boolean $value whether to return the query results in terms of arrays instead of Active Records. |
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* @return $this the query object itself |
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*/ |
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public function asArray($value = true) |
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{ |
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$this->asArray = $value; |
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return $this; |
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} |
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/** |
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* Sets the [[collectionClass]] property. |
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* @param string $className collection class to be instantiated and filled with results. |
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* @return $this the query object itself |
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* @since 2.0.10 |
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*/ |
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public function asCollection($className) |
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{ |
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$this->collectionClass = $className; |
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return $this; |
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} |
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/** |
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* Specifies the relations with which this query should be performed. |
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* |
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* The parameters to this method can be either one or multiple strings, or a single array |
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* of relation names and the optional callbacks to customize the relations. |
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* |
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* A relation name can refer to a relation defined in [[modelClass]] |
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* or a sub-relation that stands for a relation of a related record. |
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* For example, `orders.address` means the `address` relation defined |
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* in the model class corresponding to the `orders` relation. |
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* |
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* The following are some usage examples: |
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* |
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* ```php |
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* // find customers together with their orders and country |
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* Customer::find()->with('orders', 'country')->all(); |
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* // find customers together with their orders and the orders' shipping address |
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* Customer::find()->with('orders.address')->all(); |
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* // find customers together with their country and orders of status 1 |
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* Customer::find()->with([ |
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* 'orders' => function (\yii\db\ActiveQuery $query) { |
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* $query->andWhere('status = 1'); |
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* }, |
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* 'country', |
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* ])->all(); |
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* ``` |
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* |
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* You can call `with()` multiple times. Each call will add relations to the existing ones. |
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* For example, the following two statements are equivalent: |
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* |
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* ```php |
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* Customer::find()->with('orders', 'country')->all(); |
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* Customer::find()->with('orders')->with('country')->all(); |
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* ``` |
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* |
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* @return $this the query object itself |
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*/ |
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public function with() |
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{ |
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$with = func_get_args(); |
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if (isset($with[0]) && is_array($with[0])) { |
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// the parameter is given as an array |
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$with = $with[0]; |
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} |
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if (empty($this->with)) { |
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$this->with = $with; |
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} elseif (!empty($with)) { |
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foreach ($with as $name => $value) { |
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if (is_int($name)) { |
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// repeating relation is fine as normalizeRelations() handle it well |
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$this->with[] = $value; |
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} else { |
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$this->with[$name] = $value; |
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} |
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} |
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} |
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return $this; |
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} |
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/** |
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* Converts found rows into model instances |
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* @param array $rows |
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* @return array|ActiveRecord[] |
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*/ |
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private function createModels($rows) |
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{ |
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$models = []; |
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if ($this->asArray) { |
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if ($this->indexBy === null) { |
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return $rows; |
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} |
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foreach ($rows as $row) { |
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if (is_string($this->indexBy)) { |
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$key = $row[$this->indexBy]; |
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} else { |
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$key = call_user_func($this->indexBy, $row); |
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} |
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$models[$key] = $row; |
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} |
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} else { |
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/* @var $class ActiveRecord */ |
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$class = $this->modelClass; |
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if ($this->indexBy === null) { |
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foreach ($rows as $row) { |
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$model = $class::instantiate($row); |
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$modelClass = get_class($model); |
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$modelClass::populateRecord($model, $row); |
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$models[] = $model; |
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} |
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} else { |
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foreach ($rows as $row) { |
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$model = $class::instantiate($row); |
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$modelClass = get_class($model); |
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$modelClass::populateRecord($model, $row); |
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if (is_string($this->indexBy)) { |
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$key = $model->{$this->indexBy}; |
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} else { |
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$key = call_user_func($this->indexBy, $model); |
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} |
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$models[$key] = $model; |
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} |
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} |
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} |
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return $models; |
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} |
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/** |
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* Finds records corresponding to one or multiple relations and populates them into the primary models. |
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* @param array $with a list of relations that this query should be performed with. Please |
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* refer to [[with()]] for details about specifying this parameter. |
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* @param array|ActiveRecord[] $models the primary models (can be either AR instances or arrays) |
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*/ |
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public function findWith($with, &$models) |
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{ |
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$primaryModel = reset($models); |
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if (!$primaryModel instanceof ActiveRecordInterface) { |
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$primaryModel = new $this->modelClass; |
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} |
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$relations = $this->normalizeRelations($primaryModel, $with); |
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/* @var $relation ActiveQuery */ |
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foreach ($relations as $name => $relation) { |
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if ($relation->asArray === null) { |
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// inherit asArray from primary query |
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$relation->asArray($this->asArray); |
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} |
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$relation->populateRelation($name, $models); |
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} |
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} |
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/** |
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* @param ActiveRecord $model |
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* @param array $with |
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* @return ActiveQueryInterface[] |
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*/ |
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private function normalizeRelations($model, $with) |
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{ |
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$relations = []; |
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foreach ($with as $name => $callback) { |
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if (is_int($name)) { |
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$name = $callback; |
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$callback = null; |
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} |
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if (($pos = strpos($name, '.')) !== false) { |
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// with sub-relations |
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$childName = substr($name, $pos + 1); |
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$name = substr($name, 0, $pos); |
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} else { |
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$childName = null; |
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} |
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if (!isset($relations[$name])) { |
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$relation = $model->getRelation($name); |
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$relation->primaryModel = null; |
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$relations[$name] = $relation; |
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} else { |
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$relation = $relations[$name]; |
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} |
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if (isset($childName)) { |
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$relation->with[$childName] = $callback; |
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} elseif ($callback !== null) { |
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call_user_func($callback, $relation); |
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} |
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} |
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return $relations; |
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} |
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} |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: