How it works, and how to extend it.
Ways to modify the Cart
There are a few different ways to modify the shopping cart contents, each with their own purpose.
- API calls
Modify via URL
There are a number of urls that can be called to make modifications to the cart. There is a common controller 'ShoppingCart', which uses the default url 'mysite/shoppingcart'.
Add product with ID '19' to the cart:
Remove one of product with ID '19'
Remove all of product with ID '19'
Set quantity of product with ID '19' to 5
Modify via form
Cart contents can be modified with a form. This is particularly useful when needign to choose custom options for an order item.
The ShoppingCart class can be called directly for your own purposes. See ShoppingCart.php for more details.
When an item is added to the cart, the system also stores the current version associated with that product. This is done so that the product details (Price, Name, etc) do not change for a customer if the product details are changed by a store administrator.
Only if a customer completely removes an item from the cart will they be presented with a different set of details.
Ordering Customised Products (Order Item Parameters)
You may want to add seperate types of the same item to a cart. for example: "12 meters of rope", along with "5 meters of rope". or another example: "chicken soup" for delivery this week, along with "chicken soup" for delivery in two weeks
The shop module supports such products.
Making use of this requires:
- adding GET parameters to url links / forms
- modifying order item to store data, such as length, or group