Select only primary keys in UniqueValidator (yiisoft#10896) (yiisoft#…

…13098)

fixes yiisoft#10896

framework/CHANGELOG.md

@@ -30,6 +30,7 @@ Yii Framework 2 Change Log
 - Enh #7333: Improved error message for `yii\di\Instance::ensure()` when a component does not exist (cebe)
 - Enh #7420: Attributes for prompt generated with `renderSelectOptions` of `\yii\helpers\Html` helper (arogachev)
 - Enh #9162: Added support of closures in `value` for attributes in `yii\widgets\DetailView` (arogachev)
+- Enh #10896: Select only primary key when counting records in UniqueValidator (developeruz)
 - Enh #11037: `yii.js` and `yii.validation.js` use `Regexp.test()` instead of `String.match()` (arogachev, nkovacs)
 - Enh #11756: Added type mapping for `varbinary` data type in MySQL DBMS (silverfire)
 - Enh #11929: Changed `type` column type from `int` to `smallInt` in RBAC migrations (silverfire)
@@ -54,7 +55,6 @@ Yii Framework 2 Change Log
 - Enh #13050: Added `yii\filters\HostControl` allowing protection against 'host header' attacks (klimov-paul)
 - Enh: Added constants for specifying `yii\validators\CompareValidator::$type` (cebe)
 
-
 2.0.10 October 20, 2016
 -----------------------
 

framework/validators/UniqueValidator.php

@@ -145,7 +145,7 @@ public function validateAttribute($model, $attribute)
         } else {
             // if current $model is in the database already we can't use exists()
             /* @var $models ActiveRecordInterface[] */
-            $models = $query->limit(2)->all();
+            $models = $query->select($targetClass::primaryKey())->limit(2)->all();
             $n = count($models);
             if ($n === 1) {
                 $keys = array_keys($params);