Rails - Dec 2007 - How to fix routing error?

Working through the Depot application in Agile (and having lots of fun).
I''m on Iteration C3 - Handling Errors. I just added the flash to the
add_to_cart method in the store controller. Then I try the faulty URL
/store/add_to_cart/wibble to see my flash handle the error, but instead
I get this:

no route found to match
"/store/#<Product:0x48e872c>/#<Product:0x48e86f0>/#<Product:0x48e86c8>"
with {:method=>:get}

I tried googling this but no luck. I''ve proofread my additions to the
method and they appear correct. Any idea what this can be?
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Still poking around with this and having no luck, but one thing I 
noticed in the error message:

with {:method=>:get}

The book makes it explicit to use a post method of adding to cart, 
making sure button_to was used instead of link_to:

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

(Side note: then a couple pages later, they tell you to link the image 
up to the add_to_cart method using link_to - making no sense whatsoever 
to restricting it to a button in the first place)

Is this happening because hacking the URL is a GET vs. a POST?

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