# Unidom Shopping 购物领域模型引擎

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Unidom (UNIfied Domain Object Model) is a series of domain model engines. The Shopping domain model engine includes Shopping Cart and Shopping Item models.
Unidom (统一领域对象模型)是一系列的领域模型引擎。购物领域模型引擎包括购物车和购物项的模型。

## Recent Update
Check out the [Road Map](ROADMAP.md) to find out what's the next.
Check out the [Change Log](CHANGELOG.md) to find out what's new.

## Usage in Gemfile
```ruby
gem 'unidom-shopping'
```

## Run the Database Migration
```shell
rake db:migrate
```
The migration versions start with 200205.

## Call the Model
```ruby
# Create Shopping Cart
lady = Party.create name: 'Ann'
shop = Shop.create  name: 'WalMart'
shopping_cart = Unidom::Shopping::ShoppingCart.create shopper: lady, shop: shop, opened_at: Time.now

# Add Products into Shopping Cart
fish = Product.create name: 'Fish'
ball = Prdduct.create name: 'Ball'
shopping_cart.items.create! shopper: lady, shopped: fish, unit_price: 39.96, quantity: 2, opened_at: Time.now
shopping_cart.items.create! shopper: lady, shopped: ball, unit_price: 19.99, quantity: 1, opened_at: Time.now
# or
shopping_cart.add! fish, unit_price: 39.96, quantity: 2, at: Time.now
shopping_cart.add! ball, unit_price: 19.99

# Find the Shopping Cart
shopping_cart = Unidom::Shopping::ShoppingCart.shopped_by(lady).shop_is(shop).valid_at.alive.first
shopping_cart.items.valid_at.alive # fish & ball
```



## Include the Concerns
```ruby
include Unidom::Shopping::Concerns::AsCartShopper
include Unidom::Shopping::Concerns::AsItemShopper
```

### As Cart Shopper
The As Cart Shopper concern do the following tasks for the includer automatically:  
1. Define the has_many :shopping_carts macro as: ``has_many :shopping_carts, class_name: 'Unidom::Shopping::ShoppingCart', as: :shopper``
2. Define the #get_cart! method as: ``get_cart!(from: nil, at: Time.now)``

### As Item Shopper
The As Item Shopper concern do the following tasks for the includer automatically:  
1. Define the has_many :shopping_items macro as: ``has_many :shopping_items, class_name: 'Unidom::Shopping::ShoppingItem', as: :shopper``
2. Define the #add! method as: ``add!(it, into: nil, at: Time.now, unit_price: 0, quantity: 1)``