Find the longest streak of consecutive dates

consecu_dates.rb

dates = thing.order("created_at DESC").map(&:created_at)

	longest = 1
	streaks = []
	return 0 if dates.nil? || dates.empty?

	dates.each_with_index do |d, idx|
		unless (idx == dates.size - 1)
			
			d1 = dates[idx]
			d2 = dates[idx + 1] 
			td = (d2-d1) / 1.day

			if (0..1).include?(td) # start counting the streak
				longest += 1
			else
				# add that streak to the list and reset it
				streaks << longest
				longest = 0
			end
		end
	end
	streaks.uniq.max || 1