Fixes #16022: Fix UniqueValidator for PostgreSQL. Checks the uniqueness of keys in jsonb field

framework/CHANGELOG.md

@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.16 under development
 ------------------------
 
+- Bug #16022: Fix UniqueValidator for PostgreSQL. Checks the uniqueness of keys in `jsonb` field (lav45)
 - Bug #16903: Fixed 'yii\validators\NumberValidator' method 'isNotNumber' returns false for true/false value (annechko)
 - Bug #16648: Html::strtolower() was corrupting UTF-8 strings (Kolyunya)
 - Bug #13977: Skip validation if file input does not exist (RobinKamps, s1lver)

framework/validators/UniqueValidator.php

@@ -178,7 +178,7 @@ class UniqueValidator extends Validator
      */
     private function modelExists($targetClass, $conditions, $model)
     {
-        /** @var ActiveRecordInterface $targetClass $query */
+        /** @var ActiveRecordInterface|\yii\base\BaseObject $targetClass $query */
         $query = $this->prepareQuery($targetClass, $conditions);
 
         if (!$model instanceof ActiveRecordInterface || $model->getIsNewRecord() || $model->className() !== $targetClass::className()) {
@@ -311,10 +311,12 @@ class UniqueValidator extends Validator
         $prefixedConditions = [];
         foreach ($conditions as $columnName => $columnValue) {
             if (strpos($columnName, '(') === false) {
-                $prefixedColumn = "{$alias}.[[" . preg_replace(
-                    '/^' . preg_quote($alias) . '\.(.*)$/',
-                    '$1',
-                    $columnName) . ']]';
+                $columnName = preg_replace('/^' . preg_quote($alias) . '\.(.*)$/', '$1', $columnName);
+                if (strpos($columnName, '[[') === 0) {
+                    $prefixedColumn = "{$alias}.{$columnName}";
+                } else {
+                    $prefixedColumn = "{$alias}.[[{$columnName}]]";
+                }
             } else {
                 // there is an expression, can't prefix it reliably
                 $prefixedColumn = $columnName;