Working on custom layered navigation on custom collection. follow this solution link
Getting an Error:
Exception #0 (Zend_Db_Statement_Exception): SQLSTATE[42S22]: Column not found: 1054 Unknown column 'e.min_price' in 'field list', query was: SELECT COUNT(DISTINCT e.entity_id), ROUND(MAX(e.min_price ) * 1, 2) AS `max`, ROUND(MIN(e.min_price ) * 1, 2) AS `min`, STDDEV_SAMP(ROUND((e.min_price ) * 1, 2)) AS `std` FROM `catalog_product_entity` AS `e` INNER JOIN `catalog_product_entity_int` AS `at_brands` ON (`at_brands`.`entity_id` = `e`.`entity_id`) AND (`at_brands`.`attribute_id` = '509') AND (`at_brands`.`store_id` = 0) WHERE (FIND_IN_SET('16304', at_brands.value)) AND (e.min_price IS NOT NULL) 
