exchange-2.0/app/Models/UserReward.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\SoftDeletes;

class UserReward extends AbstractModel
{
    use SoftDeletes;

    protected $table = 'user_rewards';
    protected $dates = ['deleted_at'];

    public function reward()
    {
        return $this->belongsTo(Reward::class, 'reward_id');
    }

    public function user()
    {
        return $this->belongsTo(User::class, 'user_id');
    }

    public function voucher()
    {
        return $this->belongsTo(Voucher::class, 'voucher_id');
    }
}