Rails - Aug 2010 - @cart.add_product(product)

Any one can explain me????????

in agile web development book in chapter Cart Creation

depot_f/app/models/cart.rb

class Cart
  attr_reader :items
  def initialize
    @items = []
  end

 def add_product(product)
   @items << product
 end
end

depot_f/app/views/store/index.html.erb

<%= button_to ''Add to Cart'', :action =>
''add_to_cart'', :id => product %>

depot_f/app/controllers/store_controller.rb

def add_to_cart
   product = Product.find(params[:id])
   @cart = find_cart
   @cart.add_product(product)
end

when use will click on Add_to_cart button in index page then width
particular product id add_to_cart action take placed in
store_controller.rb file.After finding the array of row from from
table product and assign to product variable. then find_cart method is
called in same controller which is private and create OR initialize
session. then add_product method is called width product variable then
it will goes to  cart.rb model and then execute def

add_product(product)
   @items << product
 end

please explain me why add_product(product) method in store_controller
will go in Cart class in model cart.rb why not in other class.

thanks

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On 26 August 2010 07:04, pravin mishra
<diatm.pravin.it.07.27-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Any one can explain me????????
>
> in agile web development book in chapter Cart Creation
>
> depot_f/app/models/cart.rb
>
> class Cart
>  attr_reader :items
>  def initialize
>    @items = []
>  end
>
>  def add_product(product)
>   @items << product
>  end
> end
>
> depot_f/app/views/store/index.html.erb
>
> <%= button_to ''Add to Cart'', :action =>
''add_to_cart'', :id => product %>
>
> depot_f/app/controllers/store_controller.rb
>
> def add_to_cart
>   product = Product.find(params[:id])
>   @cart = find_cart
>   @cart.add_product(product)
> end
>
> when use will click on Add_to_cart button in index page then width
> particular product id add_to_cart action take placed in
> store_controller.rb file.After finding the array of row from from
> table product and assign to product variable. then find_cart method is
> called in same controller which is private and create OR initialize
> session. then add_product method is called width product variable then
> it will goes to  cart.rb model and then execute def
>
> add_product(product)
>   @items << product
>  end
>
> please explain me why add_product(product) method in store_controller
> will go in Cart class in model cart.rb why not in other class.
add_product is called by the line
@cart.add_product(product)
@cart is a Cart object so it calls the add_product method of the Cart
class.  Perhaps you should do a bit of reading up on basic Ruby.  The
Ruby Pickaxe book is very good.

Colin

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