CampaignVar.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class CampaignVar extends Model
{
    protected $fillable = [
        'campaign_id',
        'name',
        'default_value',
    ];

    protected $casts = [
        'campaign_id' => 'int',
    ];

    public function campaign()
    {
        return $this->belongsTo(Campaigns::class, 'campaign_id');
    }
}