Update

tambahan kan function edit dan update di controller

<?php

namespace App\Http\Controllers;
//import Model "Post
use App\Models\Post;

//return type View
use Illuminate\View\View;

//return type redirectResponse
use Illuminate\Http\RedirectResponse;
use Illuminate\Support\Facades\Storage;
use Illuminate\Http\Request;

class PostController extends Controller
{
    public function index(): View
    {
        //get posts
        $posts = Post::latest()->paginate(5);

        //render view with posts
        return view('posts.index', compact('posts'));
    }

    public function create(): View
    {
        return view('posts.create');
    }

    public function store(Request $request): RedirectResponse
    {
        //validate form
        $this->validate($request, [
            'image'     => 'required|image|mimes:jpeg,jpg,png|max:2048',
            'title'     => 'required|min:5',
            'content'   => 'required|min:10'
        ]);

        //upload image
        $image = $request->file('image');
        $image->storeAs('public/posts', $image->hashName());

        //create post
        Post::create([
            'image'     => $image->hashName(),
            'title'     => $request->title,
            'content'   => $request->content
        ]);

        //redirect to index
        return redirect()->route('posts.index')->with(['success' => 'Data Berhasil Disimpan!']);
    }

    public function show(string $id): View
    {
        //get post by ID
        $post = Post::findOrFail($id);

        //render view with post
        return view('posts.show', compact('post'));
    }

    public function edit(string $id): View
    {
        //get post by ID
        $post = Post::findOrFail($id);

        //render view with post
        return view('posts.edit', compact('post'));
    }

    public function update(Request $request, $id): RedirectResponse
    {
        //validate form
        $this->validate($request, [
            'image'     => 'image|mimes:jpeg,jpg,png|max:2048',
            'title'     => 'required|min:5',
            'content'   => 'required|min:10'
        ]);

        //get post by ID
        $post = Post::findOrFail($id);

        //check if image is uploaded
        if ($request->hasFile('image')) {

            //upload new image
            $image = $request->file('image');
            $image->storeAs('public/posts', $image->hashName());

            //delete old image
            Storage::delete('public/posts/'.$post->image);

            //update post with new image
            $post->update([
                'image'     => $image->hashName(),
                'title'     => $request->title,
                'content'   => $request->content
            ]);

        } else {

            //update post without image
            $post->update([
                'title'     => $request->title,
                'content'   => $request->content
            ]);
        }

        //redirect to index
        return redirect()->route('posts.index')->with(['success' => 'Data Berhasil Diubah!']);
    }

    public function destroy($id): RedirectResponse
    {
        //get post by ID
        $post = Post::findOrFail($id);

        //delete image
        Storage::delete('public/posts/'. $post->image);

        //delete post
        $post->delete();

        //redirect to index
        return redirect()->route('posts.index')->with(['success' => 'Data Berhasil Dihapus!']);
    }

}

buat view edit.blade.php

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Mini Bootcamp Ramadhan</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
</head>
<body style="background: lightgray">

    <div class="container mt-5 mb-5">
        <div class="row">
            <div class="col-md-12">
                <div class="card border-0 shadow-sm rounded">
                    <div class="card-body">
                        <form action="{{ route('posts.update', $post->id) }}" method="POST" enctype="multipart/form-data">
                            @csrf
                            @method('PUT')

                            <div class="form-group">
                                <label class="font-weight-bold">GAMBAR</label>
                                <input type="file" class="form-control" name="image">
                            </div>

                            <div class="form-group">
                                <label class="font-weight-bold">JUDUL</label>
                                <input type="text" class="form-control @error('title') is-invalid @enderror" name="title" value="{{ old('title', $post->title) }}" placeholder="Masukkan Judul Post">
                            
                                <!-- error message untuk title -->
                                @error('title')
                                    <div class="alert alert-danger mt-2">
                                        {{ $message }}
                                    </div>
                                @enderror
                            </div>

                            <div class="form-group">
                                <label class="font-weight-bold">KONTEN</label>
                                <textarea class="form-control @error('content') is-invalid @enderror" name="content" rows="5" placeholder="Masukkan Konten Post">{{ old('content', $post->content) }}</textarea>
                            
                                <!-- error message untuk content -->
                                @error('content')
                                    <div class="alert alert-danger mt-2">
                                        {{ $message }}
                                    </div>
                                @enderror
                            </div>

                            <button type="submit" class="btn btn-md btn-primary">UPDATE</button>
                            <button type="reset" class="btn btn-md btn-warning">RESET</button>

                        </form> 
                    </div>
                </div>
            </div>
        </div>
    </div>
    
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
<script src="https://cdn.ckeditor.com/4.13.1/standard/ckeditor.js"></script>
<script>
    CKEDITOR.replace( 'content' );
</script>
</body>
</html>

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