I'm completely new on working with Magento and I'm going to create a module in order to validate and in some cases manipulate some cart/order information.
To be specific I'm gonna restrict the customer from buying an item more than X times.
I've started working on this a bit, but I'm not so satisfied with the solution.
This is how I've done it so far:
I've created a new module with a controller which subclasses Mage_Checkout_CartController and there I've implemented the addAction-method. So every time a product is added to the cart I search through the user's order history and look for previous orders containing this product. Then I prevent it from being added and trigger an error-message.
It has a lot of shortcomings. For instance, if the customer isn't logged in at the time he can add the product, you can update the cart with too many... etc.
I would be me comfortable if I could hook on events, but I don't know where to start. Haven't found so good guides about this.
I want to do this verification when listing cart, updating cart and before submitting order.
So, my questions are:
- How do I add observers on these events in my module? I couldn't get
config.xml-configuration for event observing to work. I also need to know the names of these events. - How do I manipulate the quantity of an item in cart / delete it? When updating cart with too many of the products I want to change the quantity and trigger an error.
If you have any other ideas on a better solution for this, you're very welcome to comment.
I appreciate any help. Thanks.
