php artisan make:filament-resource Product --generate

app/Filament/Resources/Products/
├── ProductResource.php
├── Pages/
│   ├── ListProducts.php
│   ├── CreateProduct.php
│   └── EditProduct.php

// Layout components → Schemas
use Filament\Schemas\Components\Tabs;
use Filament\Schemas\Components\Grid;
use Filament\Schemas\Components\Section;

// Form fields → Forms
use Filament\Forms\Components\TextInput;
use Filament\Forms\Components\Select;
use Filament\Forms\Components\Toggle;

// Schema (NOT Form!)
use Filament\Schemas\Schema;

protected static ?string $navigationLabel = 'Sản phẩm';
protected static ?string $modelLabel = 'Sản phẩm';
protected static ?string $pluralModelLabel = 'Các sản phẩm';
protected static ?string $navigationIcon = 'heroicon-o-shopping-bag';

public static function getNavigationBadge(): ?string
{
    return (string) static::getModel()::where('active', true)->count();
}

// Form with Tabs
public static function form(Schema $schema): Schema {
    return $schema->schema([
        Tabs::make()->tabs([
            Tabs\Tab::make('Thông tin')->schema([
                TextInput::make('name')->label('Tên')->required(),
                Select::make('category_id')->label('Danh mục')->relationship('category', 'name'),
                Toggle::make('active')->label('Hiển thị')->default(true),
            ]),
        ])->columnSpanFull(),
    ]);
}

// Table with eager loading
public static function table(Table $table): Table {
    return $table
        ->modifyQueryUsing(fn($q) => $q->with(['category']))
        ->reorderable('order')  // If has order column
        ->columns([
            TextColumn::make('name')->label('Tên')->searchable(),
            ToggleColumn::make('active')->label('Hiển thị'),
        ])
        ->recordActions([EditAction::make()->iconButton()]);
}

class ProductObserver {
    public function creating(Product $p): void {
        if (empty($p->slug)) $p->slug = Str::slug($p->name);
        if (empty($p->meta_title)) $p->meta_title = $p->name;
        if ($p->order === null) $p->order = (Product::max('order') ?? 0) + 1;
    }
}

// AppServiceProvider::boot()
Product::observe(ProductObserver::class);

// Model
public function images(): MorphMany {
    return $this->morphMany(Image::class, 'model');
}

// Resource
public static function getRelations(): array {
    return [ImagesRelationManager::class];
}