Rewriting a model that has already been rewritten

Question

I've read about ten different places (mostly answers on Magento stack exchange) about how to rewrite a model that has already been rewritten, but can't get my module to work. I've used the "Modules conflict detector" extension to try to debug the problem, with no success.

So my module rewrites a model from another module, which rewrites a core model.

The relevant part of the other module's config.xml:
(file path /app/code/local/GoMage/Navigation/etc/config.xml)

<?xml version="1.0" encoding="utf-8"?>
<config>
  <modules>
    <GoMage_Navigation>
      <version>3.2</version>
    </GoMage_Navigation>
  </modules>
  <global>
    <models>
      <catalog>
        <rewrite>
          <layer_filter_item>GoMage_Navigation_Model_Layer_Filter_Item</layer_filter_item>
        </rewrite>
      </catalog>
    </models>
  </global>
</config>

My config.xml:
(file path /app/code/local/OOTD/Navigation/etc/config.xml)

<?xml version="1.0" encoding="utf-8"?>
<config>
  <modules>
    <OOTD_Navigation>
      <version>0.1</version>
    </OOTD_Navigation>
  </modules>
  <global>
     <models>
        <catalog>
          <rewrite>
            <layer_filter_item>OOTD_Navigation_Model_Layer_Filter_Item</layer_filter_item>
          </rewrite>
        </catalog>
     </models>
  </global>
</config>

/app/etc/modules/OOTD_Navigation.xml:

<?xml version="1.0" encoding="utf-8"?>
<config>
  <modules>
    <OOTD_Navigation>
      <active>true</active>
      <codepool>local</codepool>
      <depends>
        <GoMage_Navigation />
      </depends>
    </OOTD_Navigation>
  </modules>
</config>

/app/code/local/OOTD/Navigation/Model/Layer/Filter/Item.php:

class OOTD_Navigation_Model_Layer_Filter_Item extends GoMage_Navigation_Model_Layer_Filter_Item {
  // ...
}

I've tried so many things I don't know what to do anymore. If you need more information just ask. Thanks in advance.

Answer 1

codepool is case sensitive and should be codePool

Answer 2

It should work the way you are doing it, it looks absolutely correct. Could you add a file "text.php" with the following content in you "shell" folder below the Magento root folder?

<?php
require_once('../app/Mage.php');
umask(0);
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);

$item = Mage::getModel('catalog/layer_filter_item');
echo get_class($item);

The output should be "OOTD_Navigation_Model_Layer_Filter_Item". If it is, then your rewrite is working and you have a different issue. If it is "GoMage_Navigation_Model_Layer_Filter_Item", we have to check your rewrite code further.