# Cart Development

> Build and manage shopping cart functionality including adding items, calculating totals, and managing multiple cart instances. Use when this capability is needed.

- Skill: `tomevault-io/cart-development` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/cart-development`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/cart-development/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/cart-development

---


# Cart Development

## When to use this skill

Use this skill when implementing shopping cart features, e-commerce workflows, or wishlist management in Laravel applications using the `realrashid/cart` package.

## Features

- Publish configuration (`vendor:publish` tag: `cart-config`).
- Manage multiple cart instances (e.g., 'main', 'wishlist').
- Add, update, and remove items with custom options and associated models.
- Automatically calculate subtotals, taxes, and totals based on cart contents.

## Examples

### Adding an item to the cart

```php
use RealRashid\Cart\Facades\Cart;

Cart::add('id_1', 'Product 1', 2, 19.99, ['size' => 'L']);
```

### Updating cart item quantity

```php
Cart::update($rowId, 3); // Update quantity to 3
Cart::update($rowId, ['name' => 'New Product Name']); // Update other details
```

### Associating a cart item with an Eloquent model

```php
Cart::associate($rowId, 'App\Models\Product');
$item = Cart::get($rowId);
echo $item->model->name; // Access associated product model
```

### Showing cart contents and totals

```php
$cartItems = Cart::content();
$total = Cart::total();
$tax = Cart::tax();
```

## Implementation tips for AI agents

- Use `Cart::instance('wishlist')` for multiple cart purposes within the same session.
- Leverage model association to avoid manual database lookups when displaying cart items.
- Suggest `php artisan vendor:publish --tag=cart-config` to customize default tax rates and storage settings.

---
> Source: [realrashid/cart](https://github.com/realrashid/cart) — distributed by [TomeVault](https://tomevault.io).
<!-- tomevault:4.0:skill_md:2026-06-23 -->