How t solve Call to undefined method stdClass::notify() - php

Question

laravel notify() undefined method. how to solved it....help me..
Error is:-
Call to undefined method stdClass::notify()
My Controller Code Here:
use Illuminate\Http\Request;
use \App\Notifications\ResetLink;
use Auth;
use App\User;
use DB;
use App\Password;
public function forgot(){
return view('forgot');
}
public function forgotPw(Request $request){
if($user = User::where('email',$request->email)->first()){
DB::table('password_resets')->insert([
'token' => $this->token(),
'email' => $user->email
]);
$pr = DB::table('password_resets')->where('email',$user->email)- >first();
$pr->notify(new ResetLink($pr));
request()->session()->flash('success', "Forgot Link Successfully Sent...");
return redirect('login');
} else {
request()->session()->flash('error', "Forgot Link Not Sent...");
return redirect('forgot');
}
}
My Notification Code Here:
namespace App\Notifications;
use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Notification;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
class ResetLink extends Notification
{
use Queueable;
/**
* Create a new notification instance.
*
* #return void
*/
public function __construct()
{
public $pr;
}
/**
* Get the notification's delivery channels.
*
* #param mixed $notifiable
* #return array
*/
public function via($notifiable)
{
return ['mail'];
}
/**
* Get the mail representation of the notification.
*
* #param mixed $notifiable
* #return \Illuminate\Notifications\Messages\MailMessage
*/
public function toMail($notifiable)
{
return (new MailMessage)
->line('Click the Button and Reset Password!')
->action('Password Reset', url('/reset'))
->line('Thank you for using our application!');
}
/**
* Get the array representation of the notification.
*
* #param mixed $notifiable
* #return array
*/
public function toArray($notifiable)
{
return [
//
];
}
}
I tried to last 2 hours but No send mail in mailtrap....
Thank You Advance for Help me..