Attempt to read property "id" on null laravel 8 - php

Question

Can someone help me?
I have an error Attempt to read property "id" on null Laravel 8 while trying to show my table
Migration Tables
Schema::create('users', function (Blueprint $table) {
$table->id();
$table->string('username', 20)->unique();
$table->string('password', 20);
$table->enum('level',['admin', 'manager', 'pegawai']);
$table->timestamps();
});
Schema::create('employees', function (Blueprint $table) {
$table->id();
$table->foreignId('id_user')
->constrained('users')
->onUpdate('cascade')
->onDelete('cascade');
$table->string('nama_pgw', 50);
$table->string('alamat');
$table->string('no_telp', 13);
$table->string('email', 30)->unique;
$table->timestamps();
});
Employee Model
namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
class Employee extends Model
{
use HasFactory;
protected $table = 'employees';
protected $fillable = ['nama_pgw', 'username', 'alamat', 'no_telp', 'email'];
public function user(){
return $this->hasOne(User::class);
}
}
User Model
namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
class User extends Model
{
use HasFactory;
protected $table = 'users';
protected $fillable = ['username', 'password', 'level'];
public function employee(){
return $this->belongsTo(Employee::class, 'id_user', 'id');
}
}
User Controller
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use App\Models\User;
class UserController extends Controller
{
public function index()
{
$users = User::get();
return view('user/index', compact('users'));
}
}
Employee Controller
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use App\Models\Employee;
use App\Models\User;
class PegawaiController extends Controller
{
public function index()
{
$pegawai = Employee::get();
return view('pegawai/index', compact('pegawai'));
}
}
This is my view
<select name="id_user" id="username" class="uk-select">
<option>- pilih username -</option>
#foreach ($pegawai as $emp)
option value="{{$emp->users->id}}">{{$emp->users->nama_pgw}}</option>
#endforeach
</select>
Is it any problem on foreign key? I keep checking on typos possibility but everything seems right.
thank you!

Answer 1

Your relation in the employee Model is "user" while you are referring to it in blade view as "users".
Also, to run your code you can update your view:
<select name="id_user" id="username" class="uk-select">
<option>- pilih username -</option>
#foreach ($pegawai as $emp)
<option value="{{$emp->user->id}}">{{$emp->user->nama_pgw}}</option>
#endforeach
</select>
Edited:
I will also suggest optimizing your query by using eager loading. In your current code, it will execute n+1 queries where 1 query to retrieve employees and N queries to retrieve user for each employee
Update it with below code:
class PegawaiController extends Controller
{
public function index()
{
$pegawai = Employee::with(['user'])->get();
return view('pegawai/index', compact('pegawai'));
}
}