autocde2.0/app/Http/Resources/API/ProjectDetailResource.php

<?php

namespace App\Http\Resources\API;

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

class ProjectDetailResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @return array<string, mixed>
     */
    public function toArray(Request $request): array
    {
        $assetIds = [];
        foreach ($this->assets as $asset){
            $assetIds[] = $asset['id'];
        }
        $plansIds = [];
        foreach ($this->plans as $plan){
            $plansIds[] = $plan['id'];
        }
        return [
            'id' => $this->id,
            'name' => $this->name,
            'code' => $this->code,
            'status' => $this->status,
            'const' => $this->const,
            'begin' => $this->begin,
            'end' => $this->end,
            'available_days' => $this->available_days,
            'latitude' => $this->latitude,
            'longitude' => $this->longitude,
            'type' => $this->type,
            'acl' => $this->acl,
            'assets' =>$assetIds,
            'plans' =>$plansIds,
            //'whitelist' => $this->whitelist,
            'description' => $this->description,
        ];
    }
}