portal/app/Models/Container.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Relations\MorphMany;

class Container extends AbstractModel
{
    use SoftDeletes;

    protected $table = 'containers';

    public function packingLists(): belongsToMany
    {
        return $this->belongsToMany(PackingList::class, Container::class, 'container_id', 'packing_list_id');
    }

    /**
     * @return MorphMany
     */
    public function transports(): morphMany
    {
        return $this->morphMany(Transport::class, 'owner');
    }
}