// app/Models/Book.php
class Book extends Model
{
    // กำหนดฟิลด์ที่สามารถกรอกผ่านคำสั่ง Book::create() ได้อย่างปลอดภัย
    protected $fillable = ['title', 'author', 'price'];
}

// app/Http/Controllers/AdminController.php
namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use App\Models\Blog;

class AdminController extends Controller
{
    public function __construct()
    {
        $this->middleware('auth');
    }

    function blog()
    {
        $blogs = Blog::paginate(5);
        return view("blog", compact('blogs'));
    }

    function about()
    {
        // ...
    }
}

// app/Http/Controllers/AdminController.php
function insert(Request $request)
{
    $request->validate(
        [
            'title' => 'required|max:50',
            'content' => 'required',
        ],
        [
            'title.required' => 'กรุณาใส่ชื่อบทความ',
            'title.max' => 'ชื่อบทความต้องไม่เกิน 50 ตัวอักษร',
            'content.required' => 'กรุณาใส่เนื้อหา',
        ]
    );

    $data = [
        'title' => $request->title,
        'content' => $request->content,
    ];

    Blog::insert($data);

    return redirect('/blog');
}

// app/Http/Controllers/AdminController.php
function delete($id)
{
    Blog::find($id)->delete();
    return redirect('/blog');
}

// app/Http/Controllers/AdminController.php
function delete($id)
{
    Blog::find($id)->delete();
    return redirect()->back();
}

// app/Http/Controllers/AdminController.php
function edit($id)
{
    $blog = Blog::find($id);
    return view("edit", compact('blog'));
}

// app/Http/Controllers/AdminController.php
function update(Request $request, $id)
{
    $request->validate(
        [
            'title' => 'required|max:50',
            'content' => 'required',
        ],
        [
            'title.required' => 'กรุณาใส่ชื่อบทความ',
            'title.max' => 'ชื่อบทความต้องไม่เกิน 50 ตัวอักษร',
            'content.required' => 'กรุณาใส่เนื้อหา',
        ]
    );

    $data = [
        'title' => $request->title,
        'content' => $request->content,
    ];

    Blog::find($id)->update($data);

    return redirect('/blog');
}

Illuminate\Database\Eloquent\MassAssignmentException

Add [title] to fillable property to allow mass assignment on [App\Models\Blog].

// Endpoint ที่เรียกใช้งาน
POST http://127.0.0.1:8000/update,41

// app/Models/Blog.php
namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Blog extends Model
{
    use HasFactory;

    protected $fillable = [
        'title',
        'content',
        'status'
    ];
}

// app/Http/Controllers/AdminController.php
function change($id)
{
    $blog = Blog::find($id);
    $data = [
        'status' => !$blog->status
    ];
    Blog::find($id)->update($data);
    return redirect()->back();
}

// จัดระเบียบกลุ่ม URL ที่เริ่มต้นด้วย /admin
Route::prefix('admin')->group(function () {
    Route::get('/users', [UserController::class, 'index']); // URL คือ /admin/users
    Route::get('/settings', [SettingController::class, 'index']); // URL คือ /admin/settings
});

// routes/web.php
Route::prefix('author')->group(function () {
    Route::get('/about', [AdminController::class, 'about'])->name('about');
    Route::get('/blog', [AdminController::class, 'blog'])->name('blog');
    Route::get('/create', [AdminController::class, 'create'])->name('create');
    Route::post('/insert', [AdminController::class, 'insert']);
});

// app/Http/Controllers/AdminController.php
function insert(Request $request)
{
    $request->validate(
        [
            'title' => 'required|max:50',
            'content' => 'required',
        ],
        [
            'title.required' => 'กรุณาใส่ชื่อบทความ',
            'title.max' => 'ชื่อบทความต้องไม่เกิน 50 ตัวอักษร',
            'content.required' => 'กรุณาใส่เนื้อหา',
        ]
    );

    $data = [
        'title' => $request->title,
        'content' => $request->content,
    ];

    Blog::insert($data);

    return redirect('/author/blog');
}

// app/Http/Controllers/AdminController.php
function update(Request $request, $id)
{
    $request->validate(
        [
            'title' => 'required|max:50',
            'content' => 'required',
        ],
        [
            'title.required' => 'กรุณาใส่ชื่อบทความ',
            'title.max' => 'ชื่อบทความต้องไม่เกิน 50 ตัวอักษร',
            'content.required' => 'กรุณาใส่เนื้อหา',
        ]
    );

    $data = [
        'title' => $request->title,
        'content' => $request->content
    ];

    Blog::find($id)->update($data);

    return redirect('/author/blog');
}

<!-- resources/views/layouts/app.blade.php -->
<li class="nav-item dropdown">
    <a id="navbarDropdown" class="nav-link dropdown-toggle" href="#" role="button">
        สวัสดี , {{ Auth::user()->name }}
    </a>

    <div class="dropdown-menu dropdown-menu-end" aria-labelledby="navbarDropdown">
        <a class="dropdown-item" href="/author/create">เขียนบทความ</a>
        <a class="dropdown-item" href="/author/blog">บทความของฉัน</a>
        <a class="dropdown-item" href="{{ route('logout') }}"
           onclick="event.preventDefault();
                         document.getElementById('logout-form').submit();">
            ออกจากระบบ
        </a>
    </div>
</li>

<!-- resources/views/form.blade.php -->
@section('content')
    <h2 class="text text-center py-2">เขียนบทความใหม่</h2>
    <form method="POST" action="/author/insert">
        @csrf
        <div class="form-group">
            <label for="title">ข้อความ</label>
            <input type="text" name="title" class="form-control">
        </div>
        @error('title')
            <div class="my-2">
                <span class="text text-danger">{{ $message }}</span>
            </div>
        @enderror

        <div class="form-group">
            <label for="content">เนื้อหา</label>
            <textarea name="content" cols="30" rows="5" class="form-control"></textarea>
        </div>
        @error('content')
            <div class="my-2">
                <span class="text text-danger">{{ $message }}</span>
            </div>
        @enderror
        <input type="submit" value="บันทึก" class="btn btn-primary my-3">
        <a href="/blog" class="btn btn-success my-3">บทความทั้งหมด</a>
    </form>
@endsection

<!-- resources/views/home.blade.php -->
<div class="card-body">
    @if (session('status'))
        <div class="alert alert-success" role="alert">
            {{ session('status') }}
        </div>
    @endif

    {{ __('You are logged in!') }}
    <br>
    <a href="/author/create" class="btn btn-primary">เขียนบทความ</a>
    <a href="/author/blog" class="btn btn-primary">บทความทั้งหมด</a>
</div>

<!-- resources/views/form.blade.php -->
        <div class="form-group">
            <label for="content">เนื้อหา</label>
            <textarea name="content" cols="30" rows="5" class="form-control"></textarea>
        </div>
        @error('content')
            <div class="my-2">
                <span class="text text-danger">{{ $message }}</span>
            </div>
        @enderror
        <input type="submit" value="บันทึก" class="btn btn-primary my-3">
        <a href="/author/blog" class="btn btn-success my-3">บทความทั้งหมด</a>
    </form>
@endsection

<!-- resources/views/edit.blade.php -->
        <div class="form-group">
            <label for="content">เนื้อหา</label>
            <textarea name="content" cols="30" rows="5" class="form-control"></textarea>
        </div>
        @error('content')
            <div class="my-2">
                <span class="text text-danger">{{ $message }}</span>
            </div>
        @enderror
        <input type="submit" value="อัพเดท" class="btn btn-primary my-3">
        <a href="/author/blog" class="btn btn-success my-3">บทความทั้งหมด</a>
    </form>
@endsection

// routes/web.php
Route::prefix('author')->group(function () {
    Route::get('/about', [AdminController::class, 'about'])->name('about');
    Route::get('/blog', [AdminController::class, 'blog'])->name('blog');
    Route::get('/create', [AdminController::class, 'create'])->name('create');
    Route::post('/insert', [AdminController::class, 'insert']);
});