DMZ 1.7.1 (DataMapper OverZealous Edition)

[eluser]7amza[/eluser]
hey ,
i have a small problem .
my database structure:
portals(parent): id title created ..
categories(child) : id portal_id title..
pages(child) : id portal_id title..
portal.php(model) :

Code:

<?php
class Portal extends DataMapper {
    
    var $table = "portals";
    var $has_many = array(
                    "category" => array(
                    'class' => 'category',
                    'other_field' => 'category'),
                    "page" => array(
                    'class' => 'page',
                    'other_field' => 'page')
                    );

    function __construct($id = NULL)
    {
        parent::__construct($id);
    }
}

category.php

Code:

<?php
class Category extends DataMapper {

    var $table = "categories";
    var $has_one = array("portal");
    var $has_many = array("article");

    function __construct($id = NULL)
    {
        parent::__construct($id);
    }
}

page.php

Code:

<?php
class Page extends DataMapper {

    var $table = "pages";
    var $has_one = array(
                        "portal" => array(
                        'class' => 'portal',
                        'other_field' => 'portal')
                        );

    function __construct($id = NULL)
    {
        parent::__construct($id);
    }
}

so when i use relationship between categories and portal($category->portal->title) it works fine but when i try to get relationship between pages and portal($page->portal->title) it didn't work , i get the following error :

DataMapper Error: 'page' is not a valid parent relationship for Portal. Are your relationships configured correctly?

i wrote the manual especially the item #4 that's try to solve the problem but i didn't get a solution .