How to add multiple items to a cart

Rails
1

My first question here.
I am developing a shopping cart based on “Beginning Ruby on Rails E-
Commerce”.
I would like to be able to add multiple items. Because, what if I
wanted 700 items? I don’t really want to repeat clicking on add or
dragging it to the cart.
I think the best thing (maybe) would be to add a text box in the cart
for item.amount but I’m not sure how to do this and I’m worried I’ll
mess up the code.
Any ideas?
Please please help.

My cart.rb model:
def total
cart_items.inject(0) {|sum, n| n.price * n.amount + sum}
end

def add(product_id)
items = cart_items.find_all_by_product_id(product_id)
product = Product.find(product_id)

if items.size < 1
ci = cart_items.create(:product_id => product_id,
:amount => 1,
:price => product.price)
else
ci = items.first
ci.update_attribute(:amount, ci.amount + 1)
end
ci
end

def remove(product_id)
ci = cart_items.find_by_product_id(product_id)

if ci.amount > 1
  ci.update_attribute(:amount, ci.amount - 1)
else
  CartItem.destroy(ci.id)
end
return ci

end

My cart_controller.rb has:
def add
params[:id].gsub!(/product_/, “”)
@product = Product.find(params[:id])

if request.xhr?
@item = @cart.add(params[:id])
flash.now[:cart_notice] = “Added #{@item.product.title}</
em>”
render :action => “add_with_ajax”
elsif request.post?
@item = @cart.add(params[:id])
flash[:cart_notice] = “Added #{@item.product.title}”
redirect_to :controller => “catalog”
else
render
end
end

my _cart.rhtml view has:

    <% for item in @cart.cart_items %>
  • <%= render :partial => "cart/item", :object => item %>
    • <% end %>

add_with_ajax.rjs:
page.replace_html “shopping_cart”, :partial => “cart”
page.visual_effect :highlight,
“cart_item_#{@item.product.id}”, :duration => 3
page.visual_effect :fade, ‘cart_notice’, :duration => 3

add.rhtml:
Please confirm adding <%= @product.title %>
to your shopping cart.
<%= button_to “Confirm”, :action => “add”, :id => params[:id] %>

Thanks,
Elle

2

Hi Elle,

The first step is to get your model to allow adding many items with a
specified amount. In card.rb:

def add(product_id, amount = 1) # By setting the default to one,

if no amount is specified, the method is still the same

items = cart_items.find_all_by_product_id(product_id)
product = Product.find(product_id)

if items.size < 1
ci = cart_items.create(:product_id => product_id,
:amount => amount,
:price => product.price)
else
ci = items.first
ci.update_attribute(:amount, ci.amount + amount)
end
ci
end

Now we need to get it to the controller action. Change
@item = @cart.add(params[:id])
to
@item = @cart.add(params[:id], params[:amount])

Last step is to add a text box to the form. It looks like it would go
in the cart/item partial (no listed here?) but basically needs to look
like this inside your form:

<%= text_box_tag “amount”, 1 %>

Good Luck,
Rob