class UserSearch def self.search term, topic_id = nil sql = User.sql_builder( "select id, username, name, email from users u /*left_join*/ /*where*/ /*order_by*/") if topic_id sql.left_join "(select distinct p.user_id from posts p where topic_id = :topic_id) s on s.user_id = u.id", topic_id: topic_id end if term.present? sql.where("username_lower like :term_like or to_tsvector('simple', name) @@ to_tsquery('simple', regexp_replace( regexp_replace( cast(plainto_tsquery(:term) as text) ,'\''(?: |$)', ':*''', 'g'), '''', '', 'g') )", term: term, term_like: "#{term.downcase}%") sql.order_by "case when username_lower = :term then 0 else 1 end asc" end if topic_id sql.order_by "case when s.user_id is null then 0 else 1 end desc" end sql.order_by "case when last_seen_at is null then 0 else 1 end desc, last_seen_at desc, username asc limit(20)" sql.exec end end