Untitled

Count of records that are created the same day
[ [created_at date * 1000, count record for that date],
  [created_at date * 1000, count record for that date],
  [created_at date * 1000, count record for that date] ]

@kliks = Klik.all.map{|klik| [(klik.created_at.to_i * 1000), 1]}

@kliks = Klik.count( :group => "DATE( created_at )" )

SELECT *, COUNT(*) FROM kliks
GROUP BY DATE( created_at )

items = Klik.select("date(created_at) as creation_date, count(*) as count").group("date(creation_date)")
result = items.map { |k| [ k['creation_date'], k['count'] ] }

Klik.all.group_by do |k|
  k.created_at.beginning_of_day
end.map do |date, records|
  [date, records.length]
end