+------+
/| /|
+-+----+ | django-carton is a simple and lightweight application
| | | | for shopping carts and wish lists.
| +----+-+
|/ |/
+------+
- Simple: You decide how to implement the views, templates and payment processing.
- Lightweight: The cart lives in the session.
- Just a container: You define your product model the way you want.
View:
from django.http import HttpResponse
from carton.cart import Cart
from products.models import Product
def add(request):
cart = Cart(request.session)
product = Product.objects.get(id=request.GET.get('product_id'))
cart.add(product, price=product.price)
return HttpResponse("Added")
def show(request):
return render(request, 'shopping/show-cart.html')
We are assuming here that your products are defined in an application
called products.
Template:
{% load carton_tags %}
{% get_cart as cart %}
{% for item in cart.items %}
{{ item.product.name }}
{{ item.quantity }}
{{ item.subtotal }}
{% endfor %}
You can also use this convinent shortcut:
{% for product in cart.products %}
{{ product.name }}
{% endfor %}
This project is shipped with an application example called shopping
implementing basic add, remove, display features.
To use it, you will need to install the shopping application and
include the URLs in your project urls.py
# settings.py
INSTALLED_APPS = (
'carton',
'shopping',
'products',
)
# urls.py
urlpatterns = patterns('',
url(r'^shopping-cart/', include('shopping.urls')),
)
Assuming you have some products defined, you should be able to add, show and remove products like this:
/shopping-cart/add/?id=1
/shopping-cart/show/
/shopping-cart/remove/?id=1
This application requires Django version 1.4; all versions above should be fine.
Just install the package using something like pip and add carton to
your INSTALLED_APPS setting.
This is how you run tests:
./manage.py test tests --settings=carton.tests.settings
The cart is an object that's stored in session. Products are associated to cart items.
Cart
|-- CartItem
|----- product
|----- price
|----- quantity
A cart item stores a price, a quantity and an arbitrary instance of a product model.
You can access all your product's attributes, for instance it's name:
{% for item in cart.items %}
{{ item.price }}
{{ item.quantity }}
{{ item.product.name }}
{% endfor %}
These are simple operations to add, remove and access cart items:
>>> apple = Product.objects.all()[0]
>>> cart.add(apple, price=1.5)
>>> apple in cart
True
>>> cart.remove(apple)
>>> apple in cart
False
>>> orange = Product.objects.all()[1]
>>> cart.add(apple, price=1.5)
>>> cart.total
Decimal('1.5')
>>> cart.add(orange, price=2.0)
>>> cart.total
Decimal('3.5')
Note how we check weather the product is in the cart - The following statements are different ways to do the same thing:
>>> apple in cart
>>> apple in cart.products
>>> apple in [item.product for item in cart.items]
The "product" refers to the database object. The "cart item" is where we store a copy of the product, it's quantity and it's price.
>>> cart.items
[CartItem Object (apple), CartItem Object (orange)]
>>> cart.products
[<Product: apple>, <Product: orange>]
Clear all items:
>>> cart.clear()
>>> cart.total
0
Increase the quantity by adding more products:
>>> cart.add(apple, price=1.5)
>>> cart.add(apple) # no need to repeat the price.
>>> cart.total
Decimal('3.0')
Note that the price is only needed when you add a product for the first time.
>>> cart.add(orange)
*** ValueError: Missing price when adding a cart item.
You can tell how many items are in your cart:
>>> cart.clear()
>>> cart.add(apple, price=1.5)
>>> cart.add(orange, price=2.0, quantity=3)
>>> cart.count
4
>>> cart.unique_count # Regarless of product's quantity
2
You can add several products at the same time:
>>> cart.clear()
>>> cart.add(orange, price=2.0, quantity=3)
>>> cart.total
Decimal('6')
>>> cart.add(orange, quantity=2)
>>> cart.total
Decimal('10')
The price is relevant only the first time you add a product:
>>> cart.clear()
>>> cart.add(orange, price=2.0)
>>> cart.total
Decimal('2')
>>> cart.add(orange, price=100) # this price is ignored
>>> cart.total
Decimal('4')
Note how the price is ignored on the second call.
You can change the quantity of product that are already in the cart:
>>> cart.add(orange, price=2.0)
>>> cart.total
Decimal('2')
>>> cart.set_quantity(orange, quantity=3)
>>> cart.total
Decimal('6')
>>> cart.set_quantity(orange, quantity=1)
>>> cart.total
Decimal('2')
>>> cart.set_quantity(orange, quantity=0)
>>> cart.total
0
>>> cart.set_quantity(orange, quantity=-1)
*** ValueError: Quantity must be positive when updating cart
Removing all occurrence of a product:
>>> cart.add(apple, price=1.5, quantity=4)
>>> cart.total
Decimal('6.0')
>>> cart.remove(apple)
>>> cart.total
0
>>> apple in cart
False
Remove a single occurrence of a product:
>>> cart.add(apple, price=1.5, quantity=4)
>>> cart.remove_single(apple)
>>> apple in cart
True
>>> cart.total
Decimal('4.5')
>>> cart.remove_single(apple)
>>> cart.total
Decimal('3.0')
>>> cart.remove_single(apple)
>>> cart.total
Decimal('1.5')
>>> cart.remove_single(apple)
>>> cart.total
0
Django Carton has support for using multiple carts in the same project. The carts would need to be stored in Django session using different session keys.
from carton.cart import Cart
cart_1 = Cart(session=request.session, session_key='CART-1')
cart_2 = Cart(session=request.session, session_key='CART-2')
You can retrieve the cart in templates using
{% get_cart as my_cart %}.
You can change the name of this template tag using the
CART_TEMPLATE_TAG_NAME setting.
# In you project settings
CART_TEMPLATE_TAG_NAME = 'get_basket'
# In templates
{% load carton_tags %}
{% get_basket as my_basket %}
Cart items are associated to products in the database. Sometime a product can be found
in the cart when its database instance has been removed. These items are called stale
items. The CART_REMOVE_STALE_ITEMS setting defines whether stale items should be
automatically removed from the cart. By default they are removed. Removing stale items
is a silent operation that occurs every time the cart object is used. If site performance
is a concern, consider disabling this feature.
The CART_SESSION_KEY settings controls the name of the session key.