Laravel_Application_YS/app/Models/Post.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
  protected $casts = [ 'user_id' => 'integer', 'text' => 'string' ];
  public function user() { return $this->hasMany(User::class, 'id', 'user_id'); }
}