gistfile1.rb

1.9.3-p0 :017 > Statistic.where(:id=>234, :website_id=>12)
  Statistic Load (0.4ms)  SELECT "statistics".* FROM "statistics" WHERE "statistics"."id" = 234 AND "statistics"."website_id" = 12
 => [#<Statistic id: 234, organic_visits: 55, paid_visits: nil, organic_conversions: 0, paid_conversions: nil, organic_conversion_rate: #<BigDecimal:7ff1abe91890,'0.0',9(36)>, paid_conversion_rate: nil, date: "2012-01-05 00:00:00", website_id: 12, created_at: "2012-02-07 17:27:21", updated_at: "2012-02-07 17:27:21">] 

1.9.3-p0 :018 > Statistic.find_by_website_id_and_date(12,Time.now-35.days)
  Statistic Load (0.5ms)  SELECT "statistics".* FROM "statistics" WHERE "statistics"."website_id" = 12 AND "statistics"."date" = '2012-01-05 00:20:40.456598' LIMIT 1
 => nil 

#3.1

search_date = 35.days.ago
first, last = search_date.beginning_of_day, search_date.end_of_day
Stastistic.where(:website_id => 12, :date => first..last)
#3.2

search_date = 35.days.ago
Stastistic.where(:website_id => 12, :date => search_date.all_day)