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<?php
/**
* CTimestampBehavior class file.
*
* @author Jonah Turnquist <poppitypop@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CTimestampBehavior will automatically fill date and time related atributes.
*
* CTimestampBehavior will automatically fill date and time related atributes when the active record
* is created and/or upadated.
* You may specify an active record model to use this behavior like so:
* <pre>
* public function behaviors(){
* return array(
* 'CTimestampBehavior' => array(
* 'class' => 'zii.behaviors.CTimestampBehavior',
* 'createAttribute' => 'create_time_attribute',
* 'updateAttribute' => 'update_time_attribute',
* )
* );
* }
* </pre>
* The {@link createAttribute} and {@link updateAttribute} options actually default to 'create_time' and 'update_time'
* respectively, so it is not required that you configure them. If you do not wish CTimestampBehavior
* to set a timestamp for record update or creation, set the corresponding attribute option to null.
*
* By default, the update attribute is only set on record update. If you also wish it to be set on record creation,
* set the {@link setUpdateOnCreate} option to true.
*
* Although CTimestampBehavior attempts to figure out on it's own what value to inject into the timestamp attribute,
* you may specify a custom value to use instead via {@link timestampExpression}
*
* @author Jonah Turnquist <poppitypop@gmail.com>
* @version $Id$
* @package zii.behaviors
* @since 1.1
*/
class CTimestampBehavior extends CActiveRecordBehavior {
/**
* @var mixed The name of the attribute to store the creation time. Set to null to not
* use a timstamp for the creation attribute. Defaults to 'create_time'
*/
public $createAttribute = 'create_time';
/**
* @var mixed The name of the attribute to store the modification time. Set to null to not
* use a timstamp for the update attribute. Defaults to 'update_time'
*/
public $updateAttribute = 'update_time';
/**
* @var bool Whether to set the update attribute to the creation timestamp upon creation.
* Otherwise it will be left alone. Defaults to false.
*/
public $setUpdateOnCreate = false;
/**
* @var mixed The expression that will be used for generating the timestamp.
* This can be either a string representing a PHP expression (e.g. 'time()'),
* or a {@link CDbExpression} object representing a DB expression (e.g. new CDbExpression('NOW()')).
* Defaults to null, meaning that we will attempt to figure out the appropriate timestamp
* automatically. If we fail at finding the appropriate timestamp, then it will
* fall back to using the current UNIX timestamp
*/
public $timestampExpression;
/**
* @var array Maps column types to database method
*/
protected static $map = array(
'datetime'=>'NOW()',
'timestamp'=>'NOW()',
'date'=>'NOW()',
);
/**
* Responds to {@link CModel::onBeforeSave} event.
* Sets the values of the creation or modified attributes as configured
*
* @param CModelEvent $event event parameter
*/
public function beforeSave($event) {
if ($this->getOwner()->getIsNewRecord() && ($this->createAttribute !== null)) {
$this->getOwner()->{$this->createAttribute} = $this->getTimestampByAttribute($this->createAttribute);
}
if ((!$this->getOwner()->getIsNewRecord() || $this->setUpdateOnCreate) && ($this->updateAttribute !== null)) {
$this->getOwner()->{$this->updateAttribute} = $this->getTimestampByAttribute($this->updateAttribute);
}
}
/**
* Gets the approprate timestamp depending on the column type $attribute is
*
* @param string $attribute $attribute
* @return mixed timestamp (eg unix timestamp or a mysql function)
*/
protected function getTimestampByAttribute($attribute) {
if ($this->timestampExpression instanceof CDbExpression)
return $this->timestampExpression;
else if ($this->timestampExpression !== null)
return @eval('return '.$this->timestampExpression.';');
$columnType = $this->getOwner()->getTableSchema()->getColumn($attribute)->dbType;
return $this->getTimestampByColumnType($columnType);
}
/**
* Returns the approprate timestamp depending on $columnType
*
* @param string $columnType $columnType
* @return mixed timestamp (eg unix timestamp or a mysql function)
*/
protected function getTimestampByColumnType($columnType) {
return isset(self::$map[$columnType]) ? new CDbExpression(self::$map[$columnType]) : time();
}
}
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