diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2daa100..58f7b56 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 # yii2-dynamicform change Log
 
 
+## [v2.0.4 (2024-08-19)](https://github.com/yii2-extensions/dynamicform/compare/v2.0.4...v2.0.3)
+
+- Bug #2: Fixed Fixed case when primary key is not named "id".
+
+
 ## [v2.0.3 (2020-05-18)](https://github.com/yii2-extensions/dynamicform/compare/v2.0.3...v2.0.2)
 
 - Enh: Updated composer.json ('symfony/dom-crawler': '~2.8|~3.0' and 'symfony/css-selector': '~2.8|~3.0').
diff --git a/README.md b/README.md
index 5e1eb6a..b78c9cd 100644
--- a/README.md
+++ b/README.md
@@ -154,12 +154,15 @@ class CustomerController extends Controller
         $modelCustomer = $this->findModel($id);
         $modelsAddress = $modelCustomer->addresses;
 
+        // primary key of $modelsAddress
+        $pkey = 'address_id';
+
         if ($modelCustomer->load(Yii::$app->request->post())) {
 
-            $oldIDs = ArrayHelper::map($modelsAddress, 'id', 'id');
-            $modelsAddress = Model::createMultiple(Address::classname(), $modelsAddress);
+            $oldIDs = ArrayHelper::map($modelsAddress, $pkey, $pkey);
+            $modelsAddress = Model::createMultiple(Address::classname(), $modelsAddress, $pkey);
             Model::loadMultiple($modelsAddress, Yii::$app->request->post());
-            $deletedIDs = array_diff($oldIDs, array_filter(ArrayHelper::map($modelsAddress, 'id', 'id')));
+            $deletedIDs = array_diff($oldIDs, array_filter(ArrayHelper::map($modelsAddress, $pkey, $pkey)));
 
             // ajax validation
             if (Yii::$app->request->isAjax) {
@@ -179,7 +182,7 @@ class CustomerController extends Controller
                 try {
                     if ($flag = $modelCustomer->save(false)) {
                         if (! empty($deletedIDs)) {
-                            Address::deleteAll(['id' => $deletedIDs]);
+                            Address::deleteAll([$pkey => $deletedIDs]);
                         }
                         foreach ($modelsAddress as $modelAddress) {
                             $modelAddress->customer_id = $modelCustomer->id;
@@ -206,7 +209,7 @@ class CustomerController extends Controller
     }
 }
 ```
- 
+
 
 ### The View
 The View presents our complex form that will dynamically add or remove items. At the hear of it is the `DynamicFormWidget`
diff --git a/src/Models/Model.php b/src/Models/Model.php
index 953754c..e2a5ae2 100644
--- a/src/Models/Model.php
+++ b/src/Models/Model.php
@@ -14,9 +14,10 @@ class Model extends \yii\base\Model
      *
      * @param string $modelClass
      * @param array $multipleModels
+     * @param string $pk
      * @return array
      */
-    public static function createMultiple($modelClass, $multipleModels = [])
+    public static function createMultiple($modelClass, $multipleModels = [], $pk = 'id')
     {
         $model    = new $modelClass;
         $formName = $model->formName();
@@ -24,14 +25,14 @@ public static function createMultiple($modelClass, $multipleModels = [])
         $models   = [];
 
         if (!empty($multipleModels)) {
-            $keys = array_keys(ArrayHelper::map($multipleModels, 'id', 'id'));
+            $keys = array_keys(ArrayHelper::map($multipleModels, $pk, $pk));
             $multipleModels = array_combine($keys, $multipleModels);
         }
 
         if ($post && is_array($post)) {
             foreach ($post as $i => $item) {
-                if (isset($item['id']) && !empty($item['id']) && isset($multipleModels[$item['id']])) {
-                    $models[] = $multipleModels[$item['id']];
+                if (isset($item[$pk]) && !empty($item[$pk]) && isset($multipleModels[$item[$pk]])) {
+                    $models[] = $multipleModels[$item[$pk]];
                 } else {
                     $models[] = new $modelClass;
                 }