A simple shopping cart implementation.
You can find an example application here.
As of Version 0.2.0 Rails 3 is no longer supported. Please use the 0-1-x branch if you still need to implement this gem in a Rails 3 app
Include it in your Gemfile
gem 'acts_as_shopping_cart', :github => 'crowdint/acts_as_shopping_cart', :branch => '0-1-x'
And run bundler
bundle install
Just include it in your Gemfile as:
gem 'acts_as_shopping_cart', '~> 0.2.1'
And run bundle install
bundle install
You need two models, one to hold the Shopping Carts and another to hold the Items
You can use any name for the models, you just have to let each model know about each other.
For the Shopping Cart:
class Cart < ActiveRecord::Base
acts_as_shopping_cart_using :cart_item
end
For the items:
class CartItem < ActiveRecord::Base
acts_as_shopping_cart_item_for :cart
end
or, if you want to use convention over configuration, make sure your models are called ShoppingCart and ShoppingCartItem, then just use the shortcuts:
class ShoppingCart < ActiveRecord::Base
acts_as_shopping_cart
end
class ShoppingCartItem < ActiveRecord::Base
acts_as_shopping_cart_item
end
In order for this to work, the Shopping Cart Item model should have the following fields:
create_table :cart_items do |t|
t.shopping_cart_item_fields # Creates the cart items fields
end
Your ShoppingCart class will have a shopping_cart_items association that returns all the ShoppingCartItem objects in your cart.
To add an item to the cart you use the add method. You have to send the object and the price of the object as parameters.
So, if you had a Product class, you would do something like this:
@cart = Cart.create
@product = Product.find(1)
@cart.add(@product, 99.99)
In the case where your product has a price field you could do something like:
@cart.add(@product, @product.price)
I tried to make it independent to the models in case you calculate discounts, sale prices or anything customized.
You can include a quantity parameter too.
@cart.add(@product, 99.99, 5)
In that case, you would add 5 of the same products to the shopping cart. If you don't specify the quantity 1 will be assumed.
To remove an item from the cart you can use the remove method. You just have to send the object and the quantity you want to remove.
@cart.remove(@product, 1)
To remove all the items in the cart at once, just use the clear method
@cart.clear
You can find out about the total using the total method:
@cart.total # => 99.99
Taxes by default are calculated by multiplying subtotal times 8.25
If you want to change the way taxes are calculated, override the taxes method on your class that acts_as_shopping_cart.
Example:
class ShoppingCart < ActiveRecord::Base
acts_as_shopping_cart
def taxes
(subtotal - 10) * 8.3
end
end
If you just want to update the percentage, just override the tax_pct method.
class ShoppingCart < ActiveRecord::Base
acts_as_shopping_cart
def tax_pct
3.5
end
end
Shipping cost will be added to the total. By default its calculated as 0, but you can just override the shipping_cost method on your cart class depending on your needs.
class ShoppingCart < ActiveRecord::Base
acts_as_shopping_cart
def shipping_cost
5 # defines a flat $5 rate
end
end
You can find out how many unique items you have on your cart using the total_unique_items method.
So, if you had something like:
@cart.add(@product, 99.99, 5)
Then,
@cart.total_unique_items # => 5
Install the dependencies
bundle install
Run rspec
rspec spec
Run cucumber features
cucumber
Both:
rake
Crowd Interactive is a leading Ruby and Rails consultancy firm based in Mexico currently doing business with startups in the United States. We specialize in building and growing Rails applications, by increasing your IT crew onsite or offsite. We pick our projects carefully, as we only work with companies we believe in.
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