Audit active record behavior.

AuditBehavior.php

<?php

require(__DIR__ . '/../models/AuditAttribute.php');
require(__DIR__ . '/../models/AuditModel.php');

class AuditBehavior extends CActiveRecordBehavior {
        // Audit actions
	const ACTION_CREATE = 'create';
	const ACTION_DELETE = 'delete';

	/**
	 * @var string the name of the id column.
	 */
	public $idAttribute = 'id';
	/**
	 * @var array a list of columns that does not create an entry when they change.
	 */
	public $exclude = array();

	private $_oldAttributes;

	public function afterFind($event) {
		$this->_oldAttributes = $this->owner->getAttributes();
	}

	public function beforeSave($event) {
		/* @var CActiveRecord $owner */
		$owner = $this->getOwner();
		if (!$owner->isNewRecord) {
			foreach ($owner->getAttributes() as $name => $value) {
				if (in_array($name, $this->exclude)) {
					continue;
				}
				if ((string)$value !== (string)$this->_oldAttributes[$name]) {
					list($changer, $changerId) = $this->getChanger();
					list($model, $modelId) = $this->getModel();

					$entry = new AuditAttribute;
					$entry->changer = $changer;
					$entry->changerId = $changerId;
					$entry->model = $model;
					$entry->modelId = $modelId;
					$entry->attribute = $name;
					$entry->oldValue = $this->_oldAttributes[$name];
					$entry->newValue = $owner->attributes[$name];
					$entry->created = new CDbExpression('NOW()');
					$entry->save();
				}
			}
		}
	}

	public function afterSave($event) {
		if ($this->owner->isNewRecord) {
			$this->createModelEntry(self::ACTION_CREATE);
		}
	}


	public function beforeDelete($event) {
		$this->createModelEntry(self::ACTION_DELETE);
	}

	protected function createModelEntry($action) {
		list($changer, $changerId) = $this->getChanger();
		list($model, $modelId) = $this->getModel();

		$entry = new AuditModel;
		$entry->action = $action;
		$entry->changer = $changer;
		$entry->changerId = $changerId;
		$entry->model = $model;
		$entry->modelId = $modelId;
		$entry->created = new CDbExpression('NOW()');
		$entry->save();
	}

	protected function getChanger() {
		$app = Yii::app();
		if ($app instanceof CWebApplication) {
			/* @var AuditChanger $user */
			$user = $app->getUser();
			$changer = $user->modelClass;
			$changerId = $user->{$user->idAttribute};
		} else {
			$changer = 'Console';
			$changerId = 0;
		}
		return array($changer, $changerId);
	}

	protected function getModel() {
		$owner = $this->getOwner();
		$model = get_class($owner);
		$modelId = $owner->{$this->idAttribute};
		return array($model, $modelId);
	}
}