Magento: Filter a custom product by its parameters

Question

I want to filter some custom products by attributes that are used to create more instances of this product (size, color, etc.). This means that these attributes are not directly assigned to the custom product, but their children.

I already have code that filters custom products by some attributes, but they are all assigned to the main product, and the children inherit this: designer.

$attributes_designers = $this->getRequest()->getParam('designers');   
$attributes_colors = $this->getRequest()->getParam('color');
$attributes_sizes = $this->getRequest()->getParam('size');



$currentCategory =  Mage::getModel('catalog/layer')->getCurrentCategory(); 
$_productCollection = $currentCategory->getProductCollection();

if(count($attributes_designers)>0 and !in_array("ALL",$attributes_designers)) {        
    $_productCollection->addAttributeToFilter('designer',$attributes_designers);
}
if(count($attributes_colors)>0 and !in_array("ALL",$attributes_colors)) {        
    $_productCollection->addAttributeToFilter('color',$attributes_colors);
}
if(count($attributes_sizes)>0 and !in_array("ALL",$attributes_sizes)) {        
    $_productCollection->addAttributeToFilter('size_apparel_eu',$attributes_sizes);
}
if(isset($_GET['order'])) $_productCollection->setOrder($this->getRequest()->getParam('order'), $this->getRequest()->getParam('dir'));

 $_productCollection->load();

here colorand size_apparel_eudo not work because they are not directly linked to the product, and their children.

Answer 1

... - :

$_product = $this->getProduct();
$_configurable_model = Mage::getModel('catalog/product_type_configurable');
$_child_products = array();
if ($_product->getTypeId() == 'configurable')
  $_child_products = $_configurable_model->getUsedProducts(null, $_product);

- (foreach - )

foreach ($_child_products as $_child_product){
    $_child_product->getRequest()->getParam('designers');
}

, , , .

, !