ldc-doux/app/Http/Controllers/GammesController.php

<?php

namespace App\Http\Controllers;

use App\Models\Gamme;
use App\Models\Product;

class GammesController extends Controller
{
    public function index()
    {
        $gammes = Gamme::whereNull('parent_gamme_id')->orderBy('title')->get();
        //remove Food Service from count
        /** @var \Illuminate\Database\Eloquent\Collection $gammes */
        $gammes = $gammes->whereNotIn('slug','food-service');
        $nb_gammes = $gammes->count();

        return view('front.gammes.index', compact('gammes', 'nb_gammes'));
    }

    public function show(Gamme $gamme)
    {
        $gammes = collect([]);
        $dbGammes = Gamme::where('id', $gamme->id)
            ->with('childGammes')->get();

        /** @var \App\Models\Gamme $dbGamme */
        foreach ($dbGammes as $dbGamme) {
            $gammes->push($dbGamme->id);
            $dbGamme->childGammes->sortBy('title')
                ->map(function (Gamme $childGamme) use (&$gammes) {
                    $gammes->push($childGamme->id);
                });
        }

        $products = Product::whereIn('gamme_id', $gammes)
            ->where('is_published', 1)
            ->orderBy('name')
            ->get();

        return view('front.gammes.show', compact('gamme', 'products'));
    }
}