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

<?php

namespace App\Http\Controllers\API;

use App\Http\Controllers\Controller;
use App\Http\Requests\API\RequirementGroup\CreateOrUpdateRequest;
use App\Http\Resources\API\AssetGroupResource;
use App\Http\Resources\API\RequirementGroupResource;
use App\Models\RequirementGroup;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class RequirementGroupController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index(Request $request)
    {
        $pageSize=$request->get('page_size') ?? 10;
        $groups = RequirementGroup::filter($request->all())->where("parent_id",0)->with(['children'])->paginate($pageSize);

        return RequirementGroupResource::collection($groups);
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(CreateOrUpdateRequest $request)
    {
        RequirementGroup::create([
            ...$request->all(),
         'company_id' => Auth::user()->company_id,
        ]);

        return $this->created();
    }

    /**
     * Display the specified resource.
     */
    public function show(string $id)
    {
        $groups = RequirementGroup::findOrFail($id);
        return new RequirementGroupResource($groups);
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(CreateOrUpdateRequest $request, string $id)
    {
        $group = RequirementGroup::query()->findOrFail($id);
        $group->fill($request->all());
        $group->save();

        return $this->noContent();
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(string $id)
    {

        $group = RequirementGroup::query()->findOrFail($id);
        if(!empty($group->children()->first())){
            $group->delete();
        }
        else{
            throw new \Exception("Please remove the sub-level requirementGroup");
        }

        return $this->noContent();
    }
}