Rails - Jun 2007 - Passing :id param in link_to etc...

Just need some more inside information...

Sample Code from the AWDWR book.

<%= link_to ( image_tag( product.image_url ),
   { :action => :add_to_cart, :id => product },
   :method => :post,
   :confirm => "Are you sure?" ) %>

Why is my ":id =>" reference using ''product'' and
not ''product.id''

Is the :id symbol ''dual purpose'' and used as a key for an id
param AND
it also infers that the FIELD to ''get'' from the product object
is named
''id''?

Thanks.

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Hi --

On Fri, 8 Jun 2007, Jean Nibee wrote:
>
>
>
> Just need some more inside information...
>
> Sample Code from the AWDWR book.
>
> <%= link_to ( image_tag( product.image_url ),
>   { :action => :add_to_cart, :id => product },
>   :method => :post,
>   :confirm => "Are you sure?" ) %>
>
> Why is my ":id =>" reference using ''product''
and not ''product.id''
>
> Is the :id symbol ''dual purpose'' and used as a key for an
id param AND
> it also infers that the FIELD to ''get'' from the product
object is named
> ''id''?
It uses the to_param method to get the value, so product ends up being
product.to_param.  By default, to_param returns the id, but you can
override it if you wish:

   class Book < ActiveRecord::Base
     def to_param
       isbn
     end
   end

for example.


David

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