r937 from Sitepoint was kind enough to help me figure out the query I need to return correct results from my database. What I need is to be able to use this query as a scope and to be able to chain other scopes onto this one. The query is: SELECT coasters.* FROM ( SELECT order_ridden, MAX(version) AS max_version FROM coasters GROUP BY order_ridden ) AS m INNER JOIN coasters ON coasters.order_ridde