gistfile1.rb

class Array
  # Split an array with defined size
  # [1,2,3,4,5,6,7].split_by_size(2) #=> [[1, 2], [3,4], [5,6], [7]]
  def split_by_size(size = 500)
    tmp = []
    newarray = []
    self.each_with_index do |a, i|
      if i % size == 0
        unless tmp.blank?
          newarray.push tmp + [a] 
          tmp = []
        end
      else
        tmp.push a
      end      
    end
    newarray + [tmp]
  end
end