Merge branch 'Alex-Code-defaultValueValidator'

framework/CHANGELOG.md

@@ -58,6 +58,7 @@ Yii Framework 2 Change Log
 - Enh #3284: Added support for checking multiple ETags by `yii\filters\HttpCache` (qiangxue)
 - Enh #3298: Supported configuring `View::theme` using a class name (netyum, qiangxue)
 - Enh #3328: `BaseMailer` generates better text body from html body (armab)
+- Enh #3380: Allow `value` in `defaultValueValidator` to be a closure (Alex-Code)
 - Enh #3472: Added configurable option to encode spaces in dropDownLists and listBoxes (kartik-v)
 - Enh #3518: `yii\helpers\Html::encode()` now replaces invalid code sequences with "?" (DaSourcerer)
 - Enh #3521: Added `yii\filters\HttpCache::sessionCacheLimiter` (qiangxue)

framework/validators/DefaultValueValidator.php

@@ -19,7 +19,12 @@ namespace yii\validators;
 class DefaultValueValidator extends Validator
 {
     /**
-     * @var mixed the default value to be set to the specified attributes.
+     * @var mixed a PHP callable returning the default value or the default value to be set to the specified attributes.
+     * The function signature must be as follows,
+     *
+     * ~~~
+     * function foo($object, $attribute) {...return $value; }
+     * ~~~
      */
     public $value;
     /**
@@ -34,7 +39,11 @@ class DefaultValueValidator extends Validator
     public function validateAttribute($object, $attribute)
     {
         if ($this->isEmpty($object->$attribute)) {
+            if ($this->value instanceof \Closure) {
+                $object->$attribute = call_user_func($this->value, $object, $attribute);
+            } else {
                 $object->$attribute = $this->value;
             }
         }
+    }
 }