gistfile1.txt

class HashRowColumn
  include MongoMapper::Document
  key :row, String
  key :column, Hash
  key :column_ids, Array

  def self.[](r = nil)
    return HashRowColumns if(r.nil?)
    hr = HashRowColumn.find_by_row(r)
    if(hr)
      hr
    else
      HashRowColumn.create!(:row => r)
    end
  end

  def []=(c,value)
    column[c] = value
    column_ids << c
    save
  end
end

class HashRowColumns
  def self.[](c)
    HashRowColumn.all(:conditions => {:column_ids => c})
  end
end