fix #75

Author: igor-chepurnoi

.travis.yml

@@ -18,4 +18,4 @@ install:
 
 script:
   - vendor/friendsofphp/php-cs-fixer/php-cs-fixer fix --dry-run --diff
-  - phpunit --verbose
+  - vendor/bin/phpunit --verbose

composer.json

@@ -26,7 +26,8 @@
         "paulzi/yii2-adjacency-list": "^2.0"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "~2.0"
+        "friendsofphp/php-cs-fixer": "~2.0",
+        "phpunit/phpunit": "~6.0"
     },
     "autoload": {
         "psr-4": {

models/CommentModel.php

@@ -168,7 +168,7 @@ public static function find()
     public function beforeSave($insert)
     {
         if (parent::beforeSave($insert)) {
-            if ($this->parentId > 0) {
+            if ($this->parentId > 0 && $this->isNewRecord) {
                 $parentNodeLevel = static::find()->select('level')->where(['id' => $this->parentId])->scalar();
                 $this->level += $parentNodeLevel;
             }