Utility class for generating CSV files

CSVBuilder.rb

require 'csv'

class CSVBuilder
  # Initializes the CSV builder.
  def initialize
    @keys=[]
    @items=[]
  end
  # Ignores certain keys previously
  # added when writing the CSV.
  def ignore(*keysarr)
    for k in keysarr
      @keys.delete(k)
    end
  end
  # Adds a hash of keys.  +item+ is a hash
  # of keys and values.
  def add(item)
    @keys|=item.keys
    @items.push(item)
  end
  # Writes the data to CSV.  Each column
  # is a different key, and the columns are
  # sorted by key name.
  def write(file)
    CSV.open(file,"w"){|csv|
     sortedKeys=@keys.sort
     csv << sortedKeys
     for item in @items
      tmp=[]
      for k in sortedKeys
       tmp.push(item[k]||"")
      end
      csv << tmp
     end
    }
  end
end