Rails - Aug 2006 - Newbie question about adding product to cart

Hello.  I''m using the Agile Web Dev. book 1st Edition and I''m
puzzled by
the code on pp. 83-84.

<%= link_to ''Add to Cart'', {:action =>
''add_to_cart'', :id => product },
                    :class => ''addtocart'' %>

  def add_to_cart
    product = Product.find(params[:id])
    @cart = find_cart
    @cart.add_product(product)
    redirect_to(:action => ''display_cart'')
  end

In the link_to code, why isn''t :id set to product.id?  In other words, 
shouldn''t it be :id => product.id  ?

I don''t understand why the whole product object is being hashed when
the
find method is only going to use the id value anyway.

Thanks
David

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David Cheng wrote:
> Hello.  I''m using the Agile Web Dev. book 1st Edition and
I''m puzzled by
> the code on pp. 83-84.
>
> <%= link_to ''Add to Cart'', {:action =>
''add_to_cart'', :id => product },
>                     :class => ''addtocart'' %>
>
>   def add_to_cart
>     product = Product.find(params[:id])
>     @cart = find_cart
>     @cart.add_product(product)
>     redirect_to(:action => ''display_cart'')
>   end
>
> In the link_to code, why isn''t :id set to product.id?  In other
words,
> shouldn''t it be :id => product.id  ?
>
> I don''t understand why the whole product object is being hashed
when the
> find method is only going to use the id value anyway.
>
>   
Umm, I don''t have the 1st edition (I have the 2nd edition PDF) and it
is
explained there that when you make that assignment, it actually sets it 
to product.id (I think it''s due to the conventions involved) and
it''s
basically "idiomatic shorthand"

Hope this helps!
Cheers
Mohit.

Mohit Sindhwani wrote:
> David Cheng wrote:
>>     redirect_to(:action => ''display_cart'')
>>   end
>>
>> In the link_to code, why isn''t :id set to product.id?  In
other words,
>> shouldn''t it be :id => product.id  ?
>>
>> I don''t understand why the whole product object is being
hashed when the
>> find method is only going to use the id value anyway.
>>
>>   
> Umm, I don''t have the 1st edition (I have the 2nd edition PDF) and
it is
> explained there that when you make that assignment, it actually sets it
> to product.id (I think it''s due to the conventions involved) and
it''s
> basically "idiomatic shorthand"
> 
> Hope this helps!
> Cheers
> Mohit.
Yes you''re right - I just saw the footnote in my book that says the
same
thing.  D''oh!

David

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