houseworking/manage-server/app/Http/Controllers/ClassifyController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\Classify;

class ClassifyController extends Controller
{
    public function list(Request $request)
    {
        $classify_array = [];
        $classifys = Classify::all();

        $root = new Classify();
        $root->id = 0;
        $root->pid = 0;
        $root->name = '/';
        $classify_array[0] = $root;

        foreach ($classifys as $classify) {
            $classify_array[$classify->id] = $classify;
        }

        foreach ($classify_array as $key=>$value) {
            $classify_array[$value->pid]->children[$key] = $value;
        }

        return response()->json([
            "status" => 0,
            "data" => $root
        ]);
    }
}