autocde2.0/app/Http/Controllers/API/DepartmentController.php

<?php

namespace App\Http\Controllers\API;

use App\Http\Controllers\Controller;
use App\Http\Requests\API\Department\CreateOrUpdateRequest;
use App\Http\Resources\API\DepartmentResource;
use App\Models\Department;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class DepartmentController extends Controller
{

    public function index(Request $request)
    {
        $pageSize=$request->get('page_size') ?? 10;
        $department=Department::filter($request->all())->where("parent_id",0)->with(['children'])->paginate($pageSize);

        return DepartmentResource::collection($department);
    }


    public function store(CreateOrUpdateRequest $request)
    {
        $department=new Department();

        $department->mergeFillable([
            'company_id'
        ]);

        $department->fill([
            ...$request->all(),
            'company_id' => Auth::user()->company_id,
        ]);

        $department->save();

        return $this->created();
    }


    public function show(string $id)
    {
        $department=Department::query()->findOrFail($id);

        return new DepartmentResource($department);
    }



    public function update(CreateOrUpdateRequest $request,string $id)
    {
        $department=Department::findOrFail($id);
        $department->fill($request->all());
        $department->save();
        return $this->noContent();
    }


    public function destroy(string $id)
    {
        $department = Department::findOrFail($id);

        if(!empty($department->children()->first())){
            throw new \Exception("Please remove the sub-level departments.");
        }

        $department->delete();

        return $this->noContent();
    }
}