services_core/app/Http/Resources/Topology/TopologyResource.php

<?php

namespace App\Http\Resources\Topology;

use Illuminate\Http\Request;
use Illuminate\Http\Resources\Json\JsonResource;

class TopologyResource extends JsonResource
{
    public function toArray(Request $request): array
    {
        return [
            ...parent::toArray($request),
            'tenant' => $this->whenLoaded('tenant'),
            'device_type' => $this->whenLoaded('deviceType'),
            'parent' => $this->whenLoaded('parent'),
            'ports' => $this->whenLoaded('ports'),
            'source_node' => $this->whenLoaded('sourceNode'),
            'target_node' => $this->whenLoaded('targetNode'),
            'source_port' => $this->whenLoaded('sourcePort'),
            'target_port' => $this->whenLoaded('targetPort'),
        ];
    }
}