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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\db\BaseActiveRecord;
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use yii\db\Expression;
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/**
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* TimestampBehavior automatically fills the specified attributes with the current timestamp.
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*
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* To use TimestampBehavior, insert the following code to your ActiveRecord class:
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*
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* ```php
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* use yii\behaviors\TimestampBehavior;
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*
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* public function behaviors()
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* {
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* return [
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* TimestampBehavior::className(),
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* ];
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* }
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* ```
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*
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* By default, TimestampBehavior will fill the `created_at` and `updated_at` attributes with the current timestamp
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* when the associated AR object is being inserted; it will fill the `updated_at` attribute
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* with the timestamp when the AR object is being updated. The timestamp value is obtained by `time()`.
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*
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* If your attribute names are different or you want to use a different way of calculating the timestamp,
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* you may configure the [[createdAtAttribute]], [[updatedAtAttribute]] and [[value]] properties like the following:
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*
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* ```php
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* use yii\db\Expression;
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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' => TimestampBehavior::className(),
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* 'createdAtAttribute' => 'create_time',
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* 'updatedAtAttribute' => 'update_time',
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* 'value' => new Expression('NOW()'),
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* ],
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* ];
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* }
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* ```
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*
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* TimestampBehavior also provides a method named [[touch()]] that allows you to assign the current
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* timestamp to the specified attribute(s) and save them to the database. For example,
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*
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* ```php
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* $model->touch('creation_time');
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* ```
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @author Alexander Kochetov <creocoder@gmail.com>
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* @since 2.0
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*/
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class TimestampBehavior extends AttributeBehavior
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{
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/**
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* @var string the attribute that will receive timestamp value
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* Set this property to false if you do not want to record the creation time.
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*/
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public $createdAtAttribute = 'created_at';
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/**
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* @var string the attribute that will receive timestamp value.
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* Set this property to false if you do not want to record the update time.
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*/
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public $updatedAtAttribute = 'updated_at';
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/**
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* @var callable|Expression The expression that will be used for generating the timestamp.
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* This can be either an anonymous function that returns the timestamp value,
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* or an [[Expression]] object representing a DB expression (e.g. `new Expression('NOW()')`).
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* If not set, it will use the value of `time()` to set the attributes.
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*/
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public $value;
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/**
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* @inheritdoc
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*/
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public function init()
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{
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parent::init();
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if (empty($this->attributes)) {
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$this->attributes = [
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BaseActiveRecord::EVENT_BEFORE_INSERT => [$this->createdAtAttribute, $this->updatedAtAttribute],
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BaseActiveRecord::EVENT_BEFORE_UPDATE => $this->updatedAtAttribute,
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];
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}
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}
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/**
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* @inheritdoc
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*/
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protected function getValue($event)
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{
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if ($this->value instanceof Expression) {
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return $this->value;
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} else {
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return $this->value !== null ? call_user_func($this->value, $event) : time();
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}
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}
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/**
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* Updates a timestamp attribute to the current timestamp.
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*
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* ```php
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* $model->touch('lastVisit');
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* ```
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* @param string $attribute the name of the attribute to update.
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*/
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public function touch($attribute)
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{
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$this->owner->updateAttributes(array_fill_keys((array) $attribute, $this->getValue(null)));
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}
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}
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