postgres fix

Author: Smoren

composer.json

@@ -14,7 +14,7 @@
     "php": ">=7.2.0",
     "ext-pdo": "*",
     "yiisoft/yii2": "~2.0.0",
-    "smoren/query-relation-manager": "2.0.3"
+    "smoren/query-relation-manager": "2.0.4"
   },
   "autoload": {
     "psr-4": {

src/Yii2/QueryRelationDataProvider.php

@@ -101,7 +101,7 @@ protected function prepareModels()
                 foreach($pkValues as $row) {
                     $rowPrefixed = [];
                     foreach($row as $field => $value) {
-                        $rowPrefixed["`{$mainTable->alias}`.`{$field}`"] = $value;
+                        $rowPrefixed["{$mainTable->alias}.{$field}"] = $value;
                     }
                     $pkValuesPrefixed[] = $rowPrefixed;
                 }