Rails - Apr 2006 - Extending Depot Example

Hi

I am new to the whole Rails/Ruby world as having come from a MS .NET 
background, but I have followed the Depot example in the Agile Web Dev. 
with Rails book with relative ease. However as an exercise to see how 
much I had understood, I thought I would attempt to modify the example a 
bit and add a Quantity field to the store index so as to pass that value 
into the cart. I have extended the cart behaviour OK but I am having 
great difficulty seeing how to get this quantity value from the  index 
view into the controller''s add_to_cart behaviour. I have tried various 
approaches but none of them seem to work. Has anyone else done this and 
if so how? If not, then how should that example view be modified 
(preferably without modifying any model classes) to facilitate this 
requirement?

Thanks in advance
Mike

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Posted via http://www.ruby-forum.com/.

Hi Mike,

I''ve found it''s easier to get help here when I post something
concrete.  My
recommendation is to post a bit of your code so we can see where you''re
having trouble.

Best regards,
Bill

----- Original Message -----
From: "Mike Williams" <dokie1963-misc@yahoo.co.uk>
To: <rails@lists.rubyonrails.org>
Sent: 2006-04-11 12:36 PM
Subject: [Rails] Extending Depot Example

> Hi
>
> I am new to the whole Rails/Ruby world as having come from a MS .NET
> background, but I have followed the Depot example in the Agile Web Dev.
> with Rails book with relative ease. However as an exercise to see how
> much I had understood, I thought I would attempt to modify the example a
> bit and add a Quantity field to the store index so as to pass that value
> into the cart. I have extended the cart behaviour OK but I am having
> great difficulty seeing how to get this quantity value from the  index
> view into the controller''s add_to_cart behaviour. I have tried
various
> approaches but none of them seem to work. Has anyone else done this and
> if so how? If not, then how should that example view be modified
> (preferably without modifying any model classes) to facilitate this
> requirement?
>
> Thanks in advance
> Mike
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails

Bill Walton wrote:
> Hi Mike,
> 
> I''ve found it''s easier to get help here when I post
something concrete.
> My
> recommendation is to post a bit of your code so we can see where
you''re
> having trouble.
> 
> Best regards,
> Bill
> 
> ----- Original Message -----
> From: "Mike Williams" <dokie1963-misc@yahoo.co.uk>
> To: <rails@lists.rubyonrails.org>
> Sent: 2006-04-11 12:36 PM
> Subject: [Rails] Extending Depot Example
Bill

OK. The example view (index.rhtml) is as follows

<% for product in @products %>
    <div class="catalogentry">
        <img src="<%= product.image_url %>"/>
        <h3><%= h(product.title) %></h3>
        <%= product.description %>
        <span class="catalogprice"><%=
number_to_currency(product.price)
%></span>
        <%= link_to ''Add to Cart'',
                    {:action => ''add_to_cart'', :id =>
product},
                    :class => ''addtocart''  %><br/>
    </div>
    <div class="separator">&nbsp;</div>
<% end %>
<%= link_to "Show my cart", :action => "display_cart"
%>

I would like to add a quantity value to this view for each product so 
that when the user adds it to the cart, this extra piece of data is 
passed. The Product class would not really support the quantity value, 
so how can this view be modified? The Controller code is

  def add_to_cart
    product_id = params[:id]
    product = Product.find(product_id)
    @cart = find_cart
    @cart.add_product(product, params[:qty])
    redirect_to(:action => ''display_cart'')
  rescue
    logger.error("Attempt to access invalid product #{params[:id]}")
    redirect_to_index(''Invalid product'')
  end

where I have coded the parameter :qty in anticipation of being able to 
pass it in this manner. From the action onwards into the cart, the code 
is fine, it is just the view I cannot get my head around.

Thanks
Mike

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