POST request not saving data in yii2 table

Hi I am using Yii2 basic and REST API. I have a table studentrecords with fields Id, FirstName, LastName and Class. I have configured everything in web.php for REST API. Here Id field is Primary key and auto incremented. The controller is as below:

<?php

namespace app\controllers;
use Yii;
use yii\rest\ActiveController;

use app\models\Studentrecords;

class StudentrecordsController extends ActiveController
{
    public $modelClass = 'app\models\Studentrecords';
	public function behaviors()
{
return [
    [
        'class' => \yii\filters\ContentNegotiator::className(),
        'only' => ['index','createstudent'],
        'formats' => [
            'application/json' => \yii\web\Response::FORMAT_JSON,
        ],
    ],
];
}
public function actions()
{
    $actions = parent::actions();

    // disable the "delete" and "create" actions
    unset( $actions['create']);

    // customize the data provider preparation with the "prepareDataProvider()" method
    
    return $actions;
}

public function prepareDataProvider()
{
    // prepare and return a data provider for the "index" action
}



	public function actionIndex()
{
   \Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
    
}

public function actionCreatestudent()
	{
	\Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
  
  $model = new Studentrecords();
  $model->load(Yii::$app->request->post());
  $model->save();

}


}

The web.php is as below

<?php

$params = require __DIR__ . '/params.php';
$db = require __DIR__ . '/db.php';

$config = [
    'id' => 'basic',
    'basePath' => dirname(__DIR__),
    'bootstrap' => ['log'],
    'aliases' => [
        '@bower' => '@vendor/bower-asset',
        '@npm'   => '@vendor/npm-asset',
    ],
    'components' => [
        'request' => [
            // !!! insert a secret key in the following (if it is empty) - this is required by cookie validation
            'cookieValidationKey' => 'NYcoIuS2ONIwKvmNkPrZeSpXDGlfIaQV',
			'parsers' => [
        'application/json' => 'yii\web\JsonParser',
    ],
        ],
		
        'cache' => [
            'class' => 'yii\caching\FileCache',
        ],
        'user' => [
            'identityClass' => 'app\models\User',
            'enableAutoLogin' => true,
        ],
        'errorHandler' => [
            'errorAction' => 'site/error',
        ],
        'mailer' => [
            'class' => 'yii\swiftmailer\Mailer',
            // send all mails to a file by default. You have to set
            // 'useFileTransport' to false and configure a transport
            // for the mailer to send real emails.
            'useFileTransport' => true,
        ],
        'log' => [
            'traceLevel' => YII_DEBUG ? 3 : 0,
            'targets' => [
                [
                    'class' => 'yii\log\FileTarget',
                    'levels' => ['error', 'warning'],
                ],
            ],
        ],
        'db' => $db,
		
        
        'urlManager' => [
            'enablePrettyUrl' => true,
			'enableStrictParsing' => true,
            'showScriptName' => false,
            'rules' => [
        ['class' => 'yii\rest\UrlRule', 'controller' => 'studentrecords'],
    ],
        ],
        
    ],
    'params' => $params,
];

if (YII_ENV_DEV) {
    // configuration adjustments for 'dev' environment
    $config['bootstrap'][] = 'debug';
    $config['modules']['debug'] = [
        'class' => 'yii\debug\Module',
        // uncomment the following to add your IP if you are not connecting from localhost.
        //'allowedIPs' => ['127.0.0.1', '::1'],
    ];

    $config['bootstrap'][] = 'gii';
    $config['modules']['gii'] = [
        'class' => 'yii\gii\Module',
        // uncomment the following to add your IP if you are not connecting from localhost.
        //'allowedIPs' => ['127.0.0.1', '::1'],
    ];
}

return $config;

In the POSTMAN I use the POST request for API http://localhost/student/web/studentrecords/createstudent and pass the values but the result is Not Found (#404).

What should I do?

Are you sure, the url is correct?
What’s your Server config?

Normal it should be

http://localhost/studentrecords/createstudent

(depends on your server config)

What is this url returning?

http://localhost/student/web/studentrecords/index ?
or
http://localhost/studentrecords/index

When I use the URL http://localhost/studentrecords/createstudent or http://localhost/studentrecords/index it gives the error as

# Object not found!

The requested URL was not found on this server. If you entered the URL manually please check your spelling and try again.

If you think this is a server error, please contact the [webmaster](mailto:postmaster@localhost).

## Error 404

[localhost](http://localhost/)

When I use http://localhost/student/web/studentrecords/index then foll is displayed

# Not Found (#404)

In the web.php, I have added extraPatterns as below

'urlManager' => [
            'enablePrettyUrl' => true,
			'enableStrictParsing' => true,
            'showScriptName' => false,
            'rules' => [
        ['class' => 'yii\rest\UrlRule', 'controller' => ['studentrecords'],
		
		'extraPatterns' => [
        'POST createstudent' => 'createstudent',
    ],],
    ],

Now when I check it, the result is null and value does’nt gets saved into database table

POST createstudent will not work with http://localhost/studentrecords/createstudent , because your call from browser would be a GET Request.

This is a good exception :wink:
It seems, that your controller is looking for an object, but cannot find it, so the exception is thrown.
Could you provide some debug/log ?

localhost/debug