I want to select my balance "column" From user table laravel - php

Question

I'm a beginner in laravel framework,I am in the course of developing an API,and I want to select from users table balance of user when I get her Id in api So I do what I found in documentations in my contoller and i use postman to test my work but always I get a error
this is my controller:
<?php
namespace App\Http\Controllers;
use App\User;
use Illuminate\Http\Request;
class MyBalanceController extends Controller
{
public function index(Request $request)
{
# code...
// $Ads = ads::all();
// return $this->sendResponse($Ads->toArray(), 'Ads read succesfully');
// This is the name of the column you wish to search
$input = $request->all();
$validator = Validator::make($input, [
'user_id'=> 'required'
] );
$Cards = User::where('user_id','=', $request->user_id)->pluck('balance')->toArray();
//$user = Auth::user();
// $Cards = DB::select('select balance from users where id = :id', ['id' => 1]);
return response()->json(['Cards'=>$Cards]);
}
}
this is my modal :
<?php
namespace App;
use Illuminate\Notifications\Notifiable;
use Tymon\JWTAuth\Contracts\JWTSubject;
use Illuminate\Foundation\Auth\User as Authenticatable;
class User extends Authenticatable implements JWTSubject
{
use Notifiable;
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = [
'name', 'email', 'password','username','lastname','tel','adress','balance'
];
/**
* The attributes that should be hidden for arrays.
*
* #var array
*/
protected $hidden = [
'password', 'remember_token',
];
/**
* Get the identifier that will be stored in the subject claim of the JWT.
*
* #return mixed
*/
public function getJWTIdentifier()
{
return $this->getKey();
}
/**
* Return a key value array, containing any custom claims to be added to the JWT.
*
* #return array
*/
public function getJWTCustomClaims()
{
return [];
}
}

Answer 1

At first you can go to your .env file and set APP_DEBUG to true so you can see your exceptions when developing your app.
Regarding your problem try
$balance = User::findOrFail($request->user_id)->balance;
return response()->json($balance);
If no user was found with that id then a 404 HTTP error will be thrown