RankHistory.find_by_sql('select * from rank_histories rh where created_at = (select max(created_at) from rank_histories nstd where nstd.url = rh.url)')
Ruby Nested select; is there a b...
by Teflon Ted,
December 11, 2008 19:26,
4 refactorings, tagged with ruby activerecord named_scope nested select sql
What I'm doing is getting t...