private function isAttributeInAttributeSet(Mage_Eav_Model_Entity_Attribute $attribute, $attributeSetId) { $attributesMatchingInNewAttributeSet = $attribute->getResourceCollection()->setAttributeSetFilter($attributeSetId)->addFieldToFilter('entity_attribute.attribute_id', $attribute->getId())->load(); return count($attributesMatchingInNewAttributeSet) === 0; }