Typecast model id only if using mongodb AR class

extensions/gii/generators/crud/Generator.php

@@ -433,11 +433,19 @@ class Generator extends \yii\gii\Generator
         $class = $this->modelClass;
         $pks = $class::primaryKey();
         if (count($pks) === 1) {
+            if (get_parent_class(new $class) == 'yii\mongodb\ActiveRecord') {
                 return "'id' => (string)\$model->{$pks[0]}";
             } else {
+               return "'id' => \$model->{$pks[0]}"; 
+            }
+        } else {
             $params = [];
             foreach ($pks as $pk) {
+                if (get_parent_class(new $class) == 'yii\mongodb\ActiveRecord') {
                     $params[] = "'$pk' => (string)\$model->$pk";
+                } else {
+                    $params[] = "'$pk' => \$model->$pk";                   
+                }
             }
 
             return implode(', ', $params);