Table with Reorderable Positions

Categories

The main ordering functionality is defined in table method using defaultSort and reordable functions with an argument of column name to order by.

->defaultSort('position')
->reorderable('position')

app/Filament/Resources/CategoryResource.php

namespace App\Filament\Resources;
 
use App\Filament\Resources\CategoryResource\Pages;
use App\Filament\Resources\CategoryResource\RelationManagers;
use App\Models\Category;
use Filament\Forms;
use Filament\Forms\Components\TextInput;
use Filament\Forms\Form;
use Filament\Resources\Resource;
use Filament\Tables;
use Filament\Tables\Columns\TextColumn;
use Filament\Tables\Table;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\SoftDeletingScope;
 
class CategoryResource extends Resource
{
    protected static ?string $model = Category::class;
 
    protected static ?string $navigationIcon = 'heroicon-o-rectangle-stack';
 
    public static function form(Form $form): Form
    {
        return $form
            ->schema([
                TextInput::make('name')
                    ->required(),
            ]);
    }
 
    public static function table(Table $table): Table
    {
        return $table
            ->columns([
                TextColumn::make('name'),
            ])
            ->filters([
                //
            ])
            ->actions([
                Tables\Actions\EditAction::make(),
            ])
            ->bulkActions([
                Tables\Actions\BulkActionGroup::make([
                    Tables\Actions\DeleteBulkAction::make(),
                ]),
            ])
            ->defaultSort('position')
            ->reorderable('position');
    }
 
    public static function getRelations(): array
    {
        return [
            //
        ];
    }
 
    public static function getPages(): array
    {
        return [
            'index'  => Pages\ListCategories::route('/'),
            'create' => Pages\CreateCategory::route('/create'),
            'edit'   => Pages\EditCategory::route('/{record}/edit'),
        ];
    }
}

Usually position of the categories is saved after you reorder them in the table. By default this value is null.

To have position value assigned when creating a new category we have observer with creating listener. It gets maximum value of the position column on the table and...