turkmentv/app/Models/UserMaterial.php

<?php

namespace App\Models;

use App\User;
use Illuminate\Database\Eloquent\Model;

class UserMaterial extends Model
{
    protected $table = 'likes';
    protected $fillable = ['user_id','material_id','watched','liked'];
    public function user(){
        return $this->belongsTo(User::class);
    }

    public function material(){
        return $this->belongsTo(Material::class);
    }

}