Fixed quiz

app/Http/Controllers/Admin/QuizSubjectController.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Http\Controllers\Admin;
+
+use App\Http\Controllers\Controller;
+use App\Models\QuizSubject;
+use Illuminate\Http\Request;
+use Illuminate\Support\Str;
+
+class QuizSubjectController extends Controller
+{
+    public function index()
+    {
+        // Load subjects and count how many questions belong to each
+        $subjects = QuizSubject::withCount('questions')->latest()->get();
+        return view('admin.quiz-subjects.index', compact('subjects'));
+    }
+
+    public function store(Request $request)
+    {
+        $request->validate([
+            'title' => 'required|string|max:255',
+        ]);
+
+        QuizSubject::create([
+            'title' => $request->title,
+            // Generate a unique slug for potential API/URL usage
+            'slug' => Str::slug($request->title) . '-' . time(),
+        ]);
+
+        return back()->with('success', 'درس با موفقیت اضافه شد.');
+    }
+
+    public function destroy(QuizSubject $quiz_subject)
+    {
+        // Prevent deletion if questions are already assigned to this subject
+        if ($quiz_subject->questions()->count() > 0) {
+            return back()->with('error', 'این درس دارای سوال است و نمی‌تواند حذف شود. ابتدا سوالات مربوطه را ویرایش یا حذف کنید.');
+        }
+
+        $quiz_subject->delete();
+        return back()->with('success', 'درس با موفقیت حذف شد.');
+    }
+}