movies/app/Http/Controllers/Forum/TopicsController.php

<?php

namespace App\Http\Controllers\Forum;

use App\Http\Controllers\Controller;
use App\Http\Requests\Forum\TopicRequest;
use App\Models\Forum\Category;
use App\Models\Forum\Post;
use App\Models\Forum\Thread;
use App\Models\Forum\Topic;
use Illuminate\Http\Request;
use Illuminate\Support\Str;

class TopicsController extends Controller
{
    public function show(string $categorySlug, string $threadSlug, string $topicSlug)
    {
        $thread = Thread::with('category')->where('slug', $threadSlug)->first();
        $topic = Topic::with('author')->where('slug', $topicSlug)->first();

        if (!$topic || !$thread) {
            abort(404);
        }

        $topic->views_no = $topic->views_no+1;
        $topic->save();

        $posts = Post::with('author')->where('topic_id', $topic->id)->paginate(15);

        // Get similar topics from the same thread
        $similarTopics = Topic::where('thread_id', $thread->id)
            ->where('id', '!=', $topic->id)
            ->limit(5)
            ->get();

        return view('forum.topics.show', compact('thread', 'topic', 'posts', 'similarTopics'));
    }

    public function create(string $categorySlug, string $threadSlug)
    {
        // check policy
        $forumCategories = Category::get();
        $forumThreads = Thread::get();

        $currentThread = Thread::with('category')->where('slug', $threadSlug)->first();

        return view('forum.topics.create', compact('forumCategories', 'forumThreads', 'currentThread'));
    }

    public function store(TopicRequest $request, string $categorySlug, string $threadSlug)
    {
        // check policy
        $thread = Thread::with('category')->where('slug', $threadSlug)->first();

        $topic = Topic::create([
            'name' => $request->get('name'),
            'slug' => Str::slug($request->get('name')),
            'status' => Topic::STATUS_OPEN,
            'category_id' => $thread->category->id,
            'thread_id' => $thread->id,
            'user_id' => auth()->user()->id,
        ]);

        Post::create([
            'content' => $request->get('content'),
            'user_id' => auth()->user()->id,
            'category_id' => $thread->category->id,
            'thread_id' => $thread->id,
            'topic_id' => $topic->id,
        ]);

        return redirect()->route('forums.thread.topics.show', [$categorySlug, $threadSlug, $topic->slug]);
    }

    public function edit(string $categorySlug, string $threadSlug, string $topicSlug)
    {
        // check policy
    }

    public function update(TopicRequest $request)
    {
        // check policy
    }

    public function destroy()
    {
        // check policy
    }
}