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POmagento cannot override core model
 

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    <p>first of all, I apologize for asking yet another "magento core override" question here, but I followed about 10 tutorials and read through almost all similar questions posted here, no success.</p> <p>I have to override a bunch of core models and classes. The code works, because I already changed the core (in a test magento site) and it worked perfect. But every now and then a magento update is available and if we would apply the updates all of my changes would be lost. So I have to override the base code instead. I want to make my own module to put in all of the required code, because I only have to override 1 or 2 functions in every class, the rest should work like Magento intended.</p> <p>My first attempt was to override the <strong>Mage_Sales_Model_Order_Pdf_Invoice</strong> class. Ok, so I made my module. The file structure is:</p> <p><strong>app/code/local/[namespace]/Sales/etc/config.xml</strong></p> <p><strong>app/code/local/[namespace]/Sales/Helper/Data.php</strong> (This class doesn't do anything, it's just an empty class. I made it because I read somewhere that Magento sometimes doesn't recognize the module if there is no Helper class)</p> <p><strong>app/code/local/[namespace]/Sales/Model/Order/Pdf/Invoice.php</strong></p> <p><strong>app/etc/modules/[namespace]_Sales.xml</strong></p> <p>The [namespace]_Sales.xml file looks this way:</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;config&gt; &lt;modules&gt; &lt;[namespace]_Sales&gt; &lt;active&gt;true&lt;/active&gt; &lt;codePool&gt;local&lt;/codePool&gt; &lt;/[namespace]_Sales&gt; &lt;/modules&gt; &lt;/config&gt; </code></pre> <p>The config.xml file looks like this:</p> <pre><code>&lt; ?xml version="1.0"?&gt; &lt;config&gt; &lt;modules&gt; &lt;[namespace]_Sales&gt; &lt;version&gt;0.1.0&lt;/version&gt; &lt;/[namespace]_Sales&gt; &lt;/modules&gt; &lt;global&gt; &lt;helpers&gt; &lt;sales&gt; &lt;class&gt;[namespace]_Sales_Helper&lt;/class&gt; &lt;/sales&gt; &lt;/helpers&gt; &lt;models&gt; &lt;sales&gt; &lt;rewrite&gt; &lt;order_pdf_invoice&gt;[namespace]_Sales_Model_Order_Pdf_Invoice&lt;/order_pdf_invoice&gt; &lt;/rewrite&gt; &lt;/sales&gt; &lt;/models&gt; &lt;/global&gt; &lt;/config&gt; </code></pre> <p>And the Invoice.php file looks like this:</p> <pre><code>&lt;?php /****I'm adding some different classes here*******************************/ include_once Mage::getBaseDir('lib')."/myclass.php"; include_once Mage::getBaseDir('lib')."/another_library.php"; /********************************************************/ class [namespace]_Sales_Model_Order_Pdf_Invoice extends Mage_Sales_Model_Order_Pdf_Invoice { public function getPdf($invoices = array()) { //my code } } </code></pre> <p>I wanted to test this first before I go and override all the other controllers and models I have to change.</p> <p>The problem is, it still uses the original model. </p> <p>I think the module code and paths are correct, because magento finds my custom model. I checked by going into the backend and looked at <strong>System->configuration->advanced</strong></p> <p>I cleared the cache completely, so that's not it.</p> <p>I used get_class to determine what model is returned in the controller: <strong>get_class(Mage::getModel('sales/order_pdf_invoice'))</strong>, this returns <strong>Mage_Sales_Model_Order_Pdf_Invoice</strong></p> <p>I do not know where I made a mistake but I am sure I made one :(</p>
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    1. COWhy whitespace here? `< ?xml version="1.0"?>`
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    2. COI copied the xml structure out of examples and changed it accordingly to my custom module. I don't think the white space is necessary, but it works this way too.
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