[fw-general] Autoloading and routing question

[benxmy]

This may be a bit of a noob question, but I'm having difficulty figuring out
how to autoload/call a class that's in the library of my directory
structure.  The directory structure is as follows:

- application
   - configs
   - modules
      - auth
          - controllers
          - ...
          - Bootstrap.php
      - default
      - guestbook
   - Bootstrap.php
   - library
      - portalClasses
         - models
            - DbBaseTable.php
      - Zend
   - public
      - index.php

In the index.php file I set up all the base include paths I need:

$includePaths = array(
              APPLICATION_PATH . '/../library',
              APPLICATION_PATH . '/../library/portalClasses/models',
              APPLICATION_PATH . '/modules/default/controllers',
              APPLICATION_PATH . '/modules/default/models',
              APPLICATION_PATH . '/modules/guestbook/controllers',
              APPLICATION_PATH . '/modules/guestbook/models',
              APPLICATION_PATH . '/modules/authroization/controllers',
              APPLICATION_PATH . '/modules/authroization/models',
              get_include_path());
set_include_path(implode(PATH_SEPARATOR, $includePaths));

And in the primary Bootstrap.php file I've instatiated the autoloader:

protected function _initAutoload()
{
     $autoloader = new Zend_Application_Module_Autoloader(array(
                    'namespace' => 'portalLib_',
                    'basePath'  => APPLICATION_PATH .
'/../library/portalClasses',
                ));
     return $autoloader;        
}

I have a few abstract classes that my module model classes extend which
defines the correct database adapter to use for each model class which I
have put in /library/portalClasses/models.  For example: 

[DbBaseTable.php]
abstract class portalLib_Model_DbBaseTable_Abstract extends
Zend_Db_Table_Abstract{
   public function __construct ($config = null)
   {
      if (isset($this->_use_adapter)) {
            // $config = Zend_Registry::get($this->_use_adapter);
            $bootstrap = $this->getInvokeArg('bootstrap');
            $resource = $bootstrap->getPluginResource('multidb');
            $this->accessDb = $resource->getDb('access_data');
            $this->appDb = $resource->getDb();
      }      
   return parent::__construct($config);
   }
}

And I extend this class with various module models, for example in the
/application/modules/auth/models folder:

[Users.php]
class Auth_Model_Users extends portalLib_Model_DbBaseTable_Abstract
{
   protected $_name = 'access_data.users';
   protected $_primary = 'user_id';
   ...
}

...which throws a 'Class 'portalLib_Model_DbBaseTable_Abstract' not found'
error.  I've explicitly included the 'DbBaseTable.php' file and it works
fine.  Any clues as to where I'm going wrong with the autoloading and/or
routing?  Thanks for any help!
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