Activity 1

Get HTML, XML, and JSON formatted views working for who_bought requests. Experiment with including the order information in the XML view by rendering @product.to_xml(include: :orders). Do the same thing for JSON.

Hint: use builder templates for XML.

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Activity 2

What happens if you click the “Checkout” button in the sidebar while the checkout screen is already displayed? Can you find a way to disable the button in this circumstance?

Hint: variables set in the controller are available in layouts and partials as well as in the directly rendered template.

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Activity 3

The list of possible payment types is currently stored as a constant in the Order class. Can you move this list into a database table? Can you still make validation work for the field?

Hint: Replace the pay_type string with a pay_type_id in the Orders model, and use http://ar.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html#M000083 to verify that this field is set.

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