RequestGuard::attempt does not exist

Question

I am trying multiguard authentication for api when i login for admin i am getting following error

BadMethodCallException Method Illuminate\Auth\Req uestGuard::attempt does not exist.

here is my login method in controller

 public function login(Request $request){
    if(Auth::guard('admin-api')->attempt(['email' => request('email'), 'password' => request('password')]))
    {

  // if successful, then redirect to their intended location


        $user = Auth::guard('admin-api');
        $success['token'] =  $user->createToken('admin')->accessToken;
        return response()->json(['success' => $success], $this->successStatus);
    }
    else{
        return response()->json(['error'=>'Unauthorised'], 401);
    }
}

my api.php

Route::prefix('admin')->group(function () {


Route::post('login', 'API\Admin\AdminController@login')->name('admin.login');
Route::post('register', 'API\Admin\AdminController@register')->name('admin.register');

Route::group(['middleware' => 'auth:admin-api'], function(){
 Route::post('get-details', 'API\Admin\AdminController@getDetails');
});


});

my admin model

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Laravel\Passport\HasApiTokens;

class Admin extends Authenticatable
{
 use HasApiTokens, Notifiable;
 protected $table = 'admin';
 protected $guard = 'admin-api';
/**
 * The attributes that are mass assignable.
 *
 * @var array
 */
protected $fillable = [
    'name', 'email', 'password',
];

/**
 * The attributes that should be hidden for arrays.
 *
 * @var array
 */
protected $hidden = [
    'password', 'remember_token',
];

}

please tell me any other inputs you want

Solution

A better hack is this

   $credentials = ['email' => $request->username, 'password' => $request->password];

   //Since we are not using guard web in API request, we have to add it here ( 
   // guard('web') ) to access the Auth::attempt function,
   // the Auth::attempt needs web guard and crsf token, but using it here bypasses 
   // the post with crsf.
    if (Auth::guard('web')->attempt($credentials, false, false)) {
    dd('user is OK');
    }else{
   dd('user is NOT OK');
    }