Magento: Allow checkout if cart quantity multiplies in predefined number

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Every day I get new ideas but unfortunately there is the time factor and my personal goals that don’t allow me to complete everything I want. At the beginning of this week I got interesting email from Ronald about something that was in my head since I’ve created Magento extension for custom cart validations. So this time I said to myself “Now is the moment!”:

Hi,

I read your article on custom cart validation in Magento on http://www.sessiondigital.de/blog/magento-create-custom-cart-validation-rules-developers-module/ and I have a question.

I have been breaking my head over a way to enable Magento to sell products in multiples of X, but with any product combination possible. An example would be wine bottles. Any combination of wine bottles is possible, but checkout is only possible if the total quantity is a multiple of 6. If that rule is not validated, a message for the customer is displayed and checkout is disabled.

Would your method be the way to go here, and if so, can you point me in the right direction? Do you have a working example?

Your help is much appreciated.

Cheers,

Ronald

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