Variable.php

<?php

namespace App\Models;

use App\Models\Pivots\CampaignVariable;
use Illuminate\Database\Eloquent\Builder;

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

    public function scopeDefaultOrderBy(Builder $query)
    {
        return $query->orderBy('name');
    }

    public function campaigns()
    {
        return $this->belongsToMany(Campaigns::class, 'campaign_variables', 'variable_id', 'campaign_id')
            ->using(CampaignVariable::class)
            ->withPivot(CampaignVariable::getWithPivot())
            ->withTimestamps();
    }

}