michaelglass

module AlertConfirmer
  class << self
    def reject_confirm_from &block
      handle_js_modal 'confirm', false, &block
    end

    def accept_confirm_from &block
      handle_js_modal 'confirm', true, &block
    end

bogdan

CREATE INDEX "index_looks_on_created_at" ON "looks" ("created_at")

explain select * 
from looks where looks.created_at = (select max(l.created_at) from looks l where l.user_id = looks.user_id) limit 5

--                                  QUERY PLAN                                 
--  ---------------------------------------------------------------------------
--   Limit  (cost=0.00..26.50 rows=1 width=24)
--     ->  Seq Scan on looks  (cost=0.00..26.50 rows=1 width=24)
--           Filter: (created_at = (SubPlan 1))

gregolsen

1. TL; DR
2. Why?
3. When?
4. How?
   4.1. Enumerator (skip if familiar with)
   4.2. Lazy enumerator
   4.3. C patch
5. Conclusion

TL; DR