MongoMapper counting loop

gistfile1.rb

date_started = Date.parse("2011-08-09")
date_now = Date.today
@by_day = []

@days_passed = date_now.mjd - date_started.mjd

(1..@days_passed).each do |day|
  date = Kit.where(:created_at.gte => day.days.ago, :created_at.lte => (day-1).days.ago).fields(:created_at).first
  count = Kit.count(:created_at.gte => day.days.ago, :created_at.lte => (day-1).days.ago)
  @by_day.push("date" => date.created_at.strftime("%m/%d"), "count" => count)
end

@data = @by_day.reverse.to_json