Added Error message for combined attributes to unique validator

- error message `$comboNotUnique` to include model attribute labels instead of attribute names.
- Fixes #11322

close #11323

framework/CHANGELOG.md

@@ -57,6 +57,7 @@ Yii Framework 2 Change Log
 - Enh #11212: Added headers to PO file in `yii\i18n\GettextPoFile::save()` (stevekr)
 - Bug #6347: `inverseOf()` not working for dynamic relational queries (laszlovl)
 - Bug #10613: Fixed PostgreSQL Schema to return correct column names for unique indexes that have mixed case column names (cebe)
+- Bug #11322: Fixed incorrect error message in `yii\validators\UniqueValidator` for composite `targetAttribute` (PowerGamer1, silverfire, cebe)
 - Chg #11364: Updated jQuery dependency to include versions `1.12.*` (cebe)
 
 

framework/validators/UniqueValidator.php

@@ -58,6 +58,15 @@ class UniqueValidator extends Validator
      * is the [[\yii\db\Query|Query]] object that you can modify in the function.
      */
     public $filter;
+    /**
+     * @var string the user-defined error message used when [[targetAttribute]] is an array. It may contain the following placeholders:
+     *
+     * - `{attributes}`: the labels of the attributes being validated.
+     * - `{values}`: the values of the attributes being validated.
+     *
+     * @since 2.0.9
+     */
+    public $comboNotUnique;
 
 
     /**
@@ -69,6 +78,9 @@ class UniqueValidator extends Validator
         if ($this->message === null) {
             $this->message = Yii::t('yii', '{attribute} "{value}" has already been taken.');
         }
+        if ($this->comboNotUnique === null) {
+            $this->comboNotUnique = Yii::t('yii', 'The combination {values} of {attributes} has already been taken.');
+        }
     }
 
     /**
@@ -133,7 +145,32 @@ class UniqueValidator extends Validator
         }
 
         if ($exists) {
+            if (is_array($targetAttribute)) {
+                $this->addComboNotUniqueError($model, $attribute);
+            } else {
                 $this->addError($model, $attribute, $this->message);
             }
         }
     }
+    
+    /**
+     * Builds and adds [[comboNotUnique]] error message to the specified model attribute.
+     * @param \yii\base\Model $model the data model.
+     * @param string $attribute the name of the attribute.
+    */
+    private function addComboNotUniqueError($model, $attribute)
+    {
+        $attributeCombo = [];
+        $valueCombo = [];
+        foreach ($this->targetAttribute as $key => $value) {
+            if(is_int($key)) {
+                $attributeCombo[] = $model->getAttributeLabel($value);
+                $valueCombo[] = '"' . $model->$value . '"';
+            } else {
+                $attributeCombo[] = $model->getAttributeLabel($key);
+                $valueCombo[] = '"' . $model->$key . '"';
+            }
+        }
+        $this->addError($model, $attribute, $this->comboNotUnique, ['attributes' => implode(', ', $attributeCombo), 'values' => implode(', ', $valueCombo)]);
+    }
+}