142 lines
4.7 KiB
PHP
142 lines
4.7 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\behaviors;
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use yii\base\InvalidCallException;
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use yii\db\BaseActiveRecord;
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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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* Because attribute values will be set automatically by this behavior, they are usually not user input and should therefore
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* not be validated, i.e. `created_at` and `updated_at` should not appear in the [[\yii\base\Model::rules()|rules()]] method of the model.
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*
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* For the above implementation to work with MySQL database, please declare the columns(`created_at`, `updated_at`) as int(11) for being UNIX timestamp.
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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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* In case you use an [[\yii\db\Expression]] object as in the example above, the attribute will not hold the timestamp value, but
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* the Expression object itself after the record has been saved. If you need the value from DB afterwards you should call
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* the [[\yii\db\ActiveRecord::refresh()|refresh()]] method of the record.
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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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* {@inheritdoc}
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*
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* In case, when the value is `null`, the result of the PHP function [time()](https://secure.php.net/manual/en/function.time.php)
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* will be used as value.
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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 => $this->updatedAtAttribute,
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];
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}
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}
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/**
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* {@inheritdoc}
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*
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* In case, when the [[value]] is `null`, the result of the PHP function [time()](https://secure.php.net/manual/en/function.time.php)
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* will be used as value.
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*/
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protected function getValue($event)
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{
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if ($this->value === null) {
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return time();
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}
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return parent::getValue($event);
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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 $attribute the name of the attribute to update.
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* @throws InvalidCallException if owner is a new record (since version 2.0.6).
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*/
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public function touch($attribute)
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{
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/* @var $owner BaseActiveRecord */
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$owner = $this->owner;
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if ($owner->getIsNewRecord()) {
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throw new InvalidCallException('Updating the timestamp is not possible on a new record.');
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}
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$owner->updateAttributes(array_fill_keys((array) $attribute, $this->getValue(null)));
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}
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}
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