exchange-2.0/app/Models/Reward.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class Reward extends AbstractModel
{
    use SoftDeletes;

    protected $table = 'rewards';

    /**
     * Get the attributes that should be cast.
     *
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'deleted_at' => 'datetime',
        ];
    }

    public function milestones()
    {
        return $this->belongsToMany(Milestone::class, MilestoneReward::class);
    }

    /**
     * @return HasMany
     */
    public function users(): HasMany
    {
        return $this->HasMany(UserReward::class, 'reward_id', 'id');
    }
}