gistfile1.builder

require 'rubygems'
require 'pp'
require 'faster_csv'

num = 0
file = "t.csv"

data = []
columns = []

FasterCSV.foreach(file) do |row|
  num += 1
  if num == 1
    columns = row
    next
  end
  
  hash = {}
  columns.each_with_index do |col, i|
    next unless col
    val = row[i]
    
    setter = hash
    sp = col.split('__')
    sp.each_with_index do |key, j|
      if j == sp.size - 1
        setter[key] = val
      else
        setter[key] ||= {}
        
        setter = setter[key]
      end
    end
    
  end
  
  data << hash
end

pp data