Added support for using path alias with `FileDependency::fileName`

framework/CHANGELOG.md

@@ -54,6 +54,7 @@ Yii Framework 2 Change Log
 - Enh: Added method ErrorHandler::unregister() for unregistering the ErrorHandler (cebe)
 - Enh: Added `all` option to `MigrateController::actionDown()` action (creocoder, umneeq)
 - Enh: Added support for array attributes in `exist` validator (creocoder)
+- Enh: Added support for using path alias with `FileDependency::fileName` (qiangxue)
 - Chg #2913: RBAC `DbManager` is now initialized via migration (samdark)
 - Chg #3036: Upgraded Twitter Bootstrap to 3.1.x (qiangxue)
 - Chg #3175: InvalidCallException, InvalidParamException, UnknownMethodException are now extended from SPL BadMethodCallException (samdark)

framework/caching/FileDependency.php

@@ -7,6 +7,7 @@
 
 namespace yii\caching;
 
+use Yii;
 use yii\base\InvalidConfigException;
 
 /**
@@ -21,7 +22,7 @@ use yii\base\InvalidConfigException;
 class FileDependency extends Dependency
 {
     /**
-     * @var string the name of the file whose last modification time is used to
+     * @var string the file path or path alias whose last modification time is used to
      * check if the dependency has been changed.
      */
     public $fileName;
@@ -39,6 +40,6 @@ class FileDependency extends Dependency
             throw new InvalidConfigException('FileDependency::fileName must be set');
         }
 
-        return @filemtime($this->fileName);
+        return @filemtime(Yii::getAlias($this->fileName));
     }
 }