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POMagento - Implementing order limits based on custom criterias
 

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  1. POMagento - Implementing order limits based on custom criterias
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    <p>I'd like to implement a global order limit on certain products. The point of this is that I want to enable backorders on certain products and define several date periods where there are limits to how many of these individual products that may be ordered.</p> <p>Currently my custom model is loaded with the relevant information for the chosen date period and attached to the product models when they are loaded as <code>$product-&gt;setMyModel(...)</code> on these events:</p> <ul> <li><code>catalog_product_load_after</code></li> <li><code>catalog_product_collection_load_after</code></li> <li><code>sales_quote_item_collection_products_after_load</code></li> </ul> <p>Accessing my model with data for a specific product is as simple as calling <code>$product-&gt;getMyModel()</code>, which I hence will refer to as simply <em>my model</em>.</p> <p><strong>This is what I want to do:</strong></p> <p><strong>1.</strong> Whenever a product is added to a cart/quote, or placed in an order, I want to do something like this (pseudocode):</p> <pre><code>// Somehow get $product and $requestedQty (most likely from an event) $myModel = $product-&gt;getMyModel(); if($myModel-&gt;applyOrderLimit()) { // ($orderedQty + $requestedQty) &lt;= $orderLimit if($myModel-&gt;isRequestedQtyAvailable($requestedQty)) { // Issue an error and prevent the item from being ordered return; } // $orderedQty += $requestedQty $myModel-&gt;addToQtyOrdered($requestedQty); } // Continue Magentos default behaviour </code></pre> <p><strong>1.1.</strong> I suspect that <code>Mage_CatalogInventory_Item::checkQuoteItemQty()</code> should be overriden to capture the <code>$requestedQty</code> here.</p> <p><strong>2.</strong> Update <code>$myModel::ordered_qty</code> whenever an order is cancelled, refunded or such.</p> <p>I guess the real question is where do I run this code, and is there anything more to implementing such an order limit and keeping track of the qty's than I have realized?</p> <p>To me, this seem like quite a complex task. Which is why I need assistance from more experienced Magento developers!</p> <p><em>Note: I couldnt figure out how to mix numbered lists and code blocks, but I hope its readable enough</em></p>
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    1. COTry to develop an observer against sales_quote_save_before, and just through an addError message in the session, and it will role back automatically.
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    2. COThe tests I've done show that validating the qty by overriding `Mage_CatalogInventory_Item::checkQty()` works just fine (return false if it doesnt suit me). I may be overlooking something though. Anyway, I still don't know when and how it would be appropriate to add to/subtract from my models `ordered_items` - note that I only want to do this under certain conditions, not for example when the admin updates the qty (see the post)
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