git add .

git commit "fix: city selection, comment user display, and back button bug"

app/Http/Controllers/CityController.php

@@ -3,11 +3,14 @@
 namespace App\Http\Controllers;
 
 use App\Models\City;
+use App\Models\Province;
 
 class CityController extends Controller
 {
-     public function byProvince($province)
+     public function byProvince( Province $province)
     {
-        return City::where('province_id', $province)->get();
+        return response()->json(
+            $province->cities()->select('id', 'name')->get()
+        );
     }
 }