Filament: Asset Stock Management

We have a simple resource to manage categories where the create and edit form opens in a modal. For category, we only have one field, name. Here is the code for CategoryResource:

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([
                Forms\Components\TextInput::make('name'),
            ]);
    }
 
    public static function table(Table $table): Table
    {
        return $table
            ->columns([
                Tables\Columns\TextColumn::make('name'),
            ])
            ->filters([
                //
            ])
            ->actions([
                Tables\Actions\EditAction::make(),
                Tables\Actions\DeleteAction::make(),
            ])
            ->bulkActions([
                Tables\Actions\BulkActionGroup::make([
                    Tables\Actions\DeleteBulkAction::make(),
                ]),
            ]);
    }
 
    public static function getPages(): array
    {
        return [
            'index' => Pages\ManageCategories::route('/'),
        ];
    }
}

Transactions resource manages transactions for an item. We can only create a new transaction.

The form of transaction is reused in the relation manager for ItemResource. We don't need a select input in the relation manager, so the hiddenOn() method is used where the Relation Manager class is passed as a parameter.

The amount text input has a column span of full only in the Relation Manager. Here is the code for the form in the TransactionResource:

public static function form(Form $form): Form
{
    return $form
        ->schema([
            Forms\Components\Select::make('item_id')
                ->preload()
                ->required()
                ->searchable()
                ->label('Item')
                ->native(false)
                ->relationship('item', 'name')
                ->hiddenOn(TransactionsRelationManager::class),
            Forms\Components\TextInput::make('amount')
                ->numeric()
                ->required()
                ->columnSpan(fn(HasForms $livewire) => $livewire instanceof TransactionsRelationManager ? 'full' : null),
            Forms\Components\Textarea::make('comment')
                ->columnSpanFull(),
        ]);
}

The transactions create() method is overwritten to use DB transaction. After successfully creating the transaction and updating the item's stock, the user is redirected...