Ttdfjt

I need to retrieve all filterable attributes for category. I'm using that snippet:

$category = Mage::getModel('catalog/category')->load($categoryId);

$layer = Mage::getModel('catalog/layer');

$layer->setCurrentCategory($category);

$attributes = $layer->getFilterableAttributes();//$attributes now is empty array

Category has product with filterable attributes, also in categories options anchor was enabled. This code using in SOAP API.

Maybe someone know where I made mistake?

Most probably you didn't set the store id, we need to do so since it's implemented in the api:

protected function _retrieve(){

 $id = $this->getRequest()->getParam('id');
 $store_id = $this->getRequest()->getParam('store_id');

 $category = Mage::getModel("catalog/category")->load($id); 
 $category->setStoreId($store_id);

 if (!($category->getId())) $this->_critical(self::RESOURCE_NOT_FOUND);

 $layer = Mage::getModel("catalog/layer");
 $layer->setCurrentCategory($category);
 $attributes = $layer->getFilterableAttributes();

following code is used to get filterable attributes and their options

$categoryId = '5'; // replace with your category id
$category = Mage::getModel("catalog/category")->load($categoryId);
$layer = Mage::getModel("catalog/layer");
$layer->setCurrentCategory($category);

$setIds = Mage::getModel('eav/entity_attribute_set')
 ->load($attrSetName, 'attribute_set_name')
 ->getAttributeSetId();

$attributes = Mage::getResourceModel('catalog/product_attribute_collection');
$attributes->setItemObjectClass('catalog/resource_eav_attribute')
 ->setAttributeSetFilter($setIds)
 ->addStoreLabel(Mage::app()->getStore()->getId())
 ->setOrder('position', 'ASC');


$attributes->addFieldToFilter('additional_table.is_filterable', array('gt' => 0));
$attributes->load();

foreach ($attributes as $attribute) 
 $filter_attr = array();
 $filter_attr['title'] = $attribute->getFrontendLabel();
 $filter_attr['code'] = $attribute->getAttributeCode();

 if ($attribute->getAttributeCode() == 'price') 
 $filterBlockName = 'catalog/layer_filter_price';
 elseif ($attribute->getBackendType() == 'decimal') 
 $filterBlockName = 'catalog/layer_filter_decimal';
 else 
 $filterBlockName = 'catalog/layer_filter_attribute';
 

 $result = Mage::app()->getLayout()->createBlock($filterBlockName)->setLayer($layer)->setAttributeModel($attribute)->init();
 $i=0;

 foreach($result->getItems() as $option) 
 $attr_option = array();
 if($attribute->getAttributeCode() == 'price') 
 $attr_option['label'] = str_replace(array('<span class="price">','</span>'),'',$option->getLabel());
 else 
 $attr_option['label'] = $option->getLabel();
 

 $attr_option['value'] = $option->getValue();
 $attr_option['count'] = $option->getCount();
 $i++;
 $filter_attr['options'][] = $attr_option;
 

 if($i!=0)
 $filter_attributes[] = $filter_attr;