whats wrong with this schema, or is it my xpdo-query?

	<object class="Products" table="products" extends="xPDOObject">
		<field key="products_id" dbtype="int" precision="11" phptype="integer" null="false" index="pk"  generated="native" />
		<field key="products_ean" dbtype="varchar" precision="128" phptype="string" null="true" />
		<field key="products_quantity" dbtype="int" precision="4" phptype="integer" null="false" default="0" />
		<field key="products_shippingtime" dbtype="int" precision="4" phptype="integer" null="false" default="0" />
		<field key="products_model" dbtype="varchar" precision="64" phptype="string" null="true" />
        <and_so_on />      

		<index alias="PRIMARY" name="PRIMARY" primary="true" unique="true" type="BTREE" >
			<column key="products_id" length="" collation="A" null="false" />
		</index>
        
        <composite alias="ProductsDescription" class="ProductsDescription" local="products_id" foreign="products_id" cardinality="one" owner="local" />
        
	</object>
	<object class="ProductsDescription" table="products_description" extends="xPDOObject">
		<field key="products_id" dbtype="int" precision="11" phptype="integer" null="false" index="pk"  generated="native" />
		<field key="language_id" dbtype="int" precision="11" phptype="integer" null="false" default="1" index="pk" />
		<field key="products_name" dbtype="varchar" precision="64" phptype="string" null="false" default="" index="index" />
		<field key="products_description" dbtype="text" phptype="string" null="true" />
        <and_so_on />   

		<index alias="PRIMARY" name="PRIMARY" primary="true" unique="true" type="BTREE" >
			<column key="products_id" length="" collation="A" null="false" />
			<column key="language_id" length="" collation="A" null="false" />
		</index>
        
        <aggregate alias="Products" class="Products" local="products_id" foreign="products_id" cardinality="one" owner="foreign" />        
	</object>

<?php    
    
$c = $xpdo->newQuery('Products');

$collection = $xpdo->getCollection('Products', $c);
$rows=array();
foreach ($collection as $object){
	$desc = $object->getOne('ProductsDescription');
    $row = array_merge($object->toArray(),$desc->toArray());
    $rows[]=$row;
}

<?php   
$c = $xpdo->newQuery('Products');
$c->leftJoin('ProductsDescription','desc');
$c->select('Products.*');
//$c->select('`desc`.`products_id` AS products_desc_id');
$c->select('`desc`.`products_name` AS products_name');

$collection = $xpdo->getCollection('Products', $c);
$rows=array();
foreach ($collection as $object){
    $row =$object->toArray();
    
    $row['products_name'] = $object->get('products_name'); 
    $rows[]=$row;
}

<?php   
$c = $xpdo->newQuery('Products');
$c->leftJoin('ProductsDescription','desc','desc.products_id=Products.products_id');
$c->select('Products.*');
//$c->select('`desc`.`products_id` AS products_desc_id');
$c->select('`desc`.`products_name` AS products_name');

$collection = $xpdo->getCollection('Products', $c);
$rows=array();
foreach ($collection as $object){
    $row =$object->toArray();
    
    $row['products_name'] = $object->get('products_name'); 
    $rows[]=$row;
}

<?php

$c = $xpdo->newQuery($classname);

$c->select('Products.*');

//here some conditions

$collection = $xpdo->getCollectionGraph($classname, '{ "ProductsDescription":{} }', $c );

$rows=array();
foreach ($collection as $object){
    
    $row = array_merge($object->toArray(),$object->ProductsDescription->toArray());
    $rows[]=$row;
}