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POAdd product to cart in observer
 

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    <p>I need to create a possibility for customers to offer a one product free of charge (as an example) in Magento shop. I figured out most of things from <a href="https://stackoverflow.com/questions/5104482/programmatically-add-product-to-cart-with-price-change">this</a> post, but now I have one problem. I am created an Observer method that is executed on <code>checkout_cart_product_add_after</code>. And there I have some code (its just a part of whole thing): </p> <pre><code> $productId = $observer-&gt;getProduct()-&gt;getId(); $cartHelper = Mage::helper('checkout/cart'); $items = $cartHelper-&gt;getCart()-&gt;getItems(); Mage::getModel('core/session')-&gt;addNotice('Product id: '.$productId); foreach ($items as $item) { if ($item-&gt;getProduct()-&gt;getId() == $productId) { $itemId = $item-&gt;getItemId(); $cart = $cartHelper-&gt;getCart()-&gt;removeItem($itemId)-&gt;save() ;//It WORKS!!!!!!!!!!!! $product = Mage::getModel('catalog/product')-&gt;load($productId); $cart-&gt;addProduct($product, $this-&gt;_getRequest()-&gt;getParams()); $cart-&gt;save(); Mage::getSingleton('checkout/session')-&gt;setCartWasUpdated(true); break; } } </code></pre> <p>So first of all my code adds a product to cart with 0.00 price (product as an example) based on some request parameters. Thats part works fine so it is not posted here. The second part (that I posted above) must delete an existing product and replace it with product with normal price. Almost everything works fine except one thing - the line <code>$cart-&gt;addProduct($product, $this-&gt;_getRequest()-&gt;getParams());</code> don't work and I cant understand why (no errors, no exceptions, no logs). <code>_getRequest</code> method looks like this:</p> <pre><code> protected function _getRequest() { return Mage::app()-&gt;getRequest(); } </code></pre> <p>And if I log an <code>$this-&gt;_getRequest()-&gt;getParams()</code> there is will be something like this: </p> <pre><code> 2012-04-09T14:46:56+00:00 DEBUG (7): Array( [uenc] =&gt; aHR0cDovL2xvY2FsaG9zdC93b3AvZmVhdHVyZWQvY2xhc3NpYy1saW5lLXBvbHkuaHRtbA,, [product] =&gt; 50 [related_product] =&gt; [bundle_option] =&gt; Array( [20] =&gt; 75 [21] =&gt; 84 [22] =&gt; 94 ) [qty] =&gt; 1 [send-request] =&gt; 0 ) </code></pre> <p>So why that <code>$cart-&gt;addProduct($product, $this-&gt;_getRequest()-&gt;getParams());</code> will not work? How to do it right? Maybe it is better to use <code>addAction()</code> of <code>Mage_Checkout_CartController</code> (overwrite it)? Sorry for my language. Thanks for answers. Hope somebody can help me...</p>
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    1. COIt seems like you are adding the same product you are removing (you are using both times the same $productId. Is that what you wanted?
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    2. COYes, it is. The logic of this is to add product to cart with normal price if this product already was added before with 0.00 price. Maybe I would rather just change the price of a quote? But i think it will not work to.
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    3. COAren't you supposed to be working with the QUOTE vs. the cart. Products are added to the quote before the checkout process begins.
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