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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\behaviors;
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use Yii;
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use Closure;
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use yii\base\Behavior;
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use yii\base\Event;
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/**
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* AttributeBehavior automatically assigns a specified value to one or multiple attributes of an ActiveRecord
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* object when certain events happen.
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*
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* To use AttributeBehavior, configure the [[attributes]] property which should specify the list of attributes
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* that need to be updated and the corresponding events that should trigger the update. Then configure the
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* [[value]] property with a PHP callable whose return value will be used to assign to the current attribute(s).
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* For example,
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*
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* ~~~
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* use yii\behaviors\AttributeBehavior;
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*
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* public function behaviors()
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* {
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* return [
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* [
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* 'class' => AttributeBehavior::className(),
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* 'attributes' => [
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* ActiveRecord::EVENT_BEFORE_INSERT => 'attribute1',
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* ActiveRecord::EVENT_BEFORE_UPDATE => 'attribute2',
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* ],
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* 'value' => function ($event) {
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* return 'some value';
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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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* @author Luciano Baraglia <luciano.baraglia@gmail.com>
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class AttributeBehavior extends Behavior
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{
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/**
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* @var array list of attributes that are to be automatically filled with the value specified via [[value]].
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* The array keys are the ActiveRecord events upon which the attributes are to be updated,
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* and the array values are the corresponding attribute(s) to be updated. You can use a string to represent
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* a single attribute, or an array to represent a list of attributes. For example,
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*
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* ```php
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* [
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* ActiveRecord::EVENT_BEFORE_INSERT => ['attribute1', 'attribute2'],
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* ActiveRecord::EVENT_BEFORE_UPDATE => 'attribute2',
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* ]
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* ```
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*/
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public $attributes = [];
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/**
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* @var mixed the value that will be assigned to the current attributes. This can be an anonymous function
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* or an arbitrary value. If the former, the return value of the function will be assigned to the attributes.
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* The signature of the function should be as follows,
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*
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* ```php
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* function ($event)
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* {
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* // return value will be assigned to the attribute
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* }
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* ```
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*/
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public $value;
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/**
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* @inheritdoc
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*/
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public function events()
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{
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return array_fill_keys(array_keys($this->attributes), 'evaluateAttributes');
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}
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/**
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* Evaluates the attribute value and assigns it to the current attributes.
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* @param Event $event
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*/
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public function evaluateAttributes($event)
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{
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if (!empty($this->attributes[$event->name])) {
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$attributes = (array) $this->attributes[$event->name];
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$value = $this->getValue($event);
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foreach ($attributes as $attribute) {
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// ignore attribute names which are not string (e.g. when set by TimestampBehavior::updatedAtAttribute)
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if (is_string($attribute)) {
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$this->owner->$attribute = $value;
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}
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}
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}
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}
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/**
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* Returns the value of the current attributes.
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* This method is called by [[evaluateAttributes()]]. Its return value will be assigned
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* to the attributes corresponding to the triggering event.
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* @param Event $event the event that triggers the current attribute updating.
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* @return mixed the attribute value
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*/
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protected function getValue($event)
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{
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return $this->value instanceof Closure ? call_user_func($this->value, $event) : $this->value;
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}
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}
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