fix

api/controllers/UserController.php

@@ -20,7 +20,8 @@ class UserController extends BaseController
     {
         $model = new LoginForm();
         $model->setScenario(LoginForm::SCENARIOS_LOGIN);
-        $model->load(Yii::$app->request->post());
+        #var_dump(Yii::$app->request->post());exit;
+        $model->load(Yii::$app->request->post(),'');
         if ($model->login()) {
             $response = [
                 'success' => true,

common/models/LoginForm.php

@@ -81,7 +81,7 @@ class LoginForm extends Model
     protected function getUser()
     {
         if ($this->_user === null) {
-            $this->_user = User::findByUsername($this->username);
+            $this->_user = Admin::findByUsername($this->username);
         }
 
         return $this->_user;