import.rake

  task :import_stat_range => :environment do
    entity = ENV['ENTITY']
    start_date = ENV['START_DATE'].to_date
    end_date = ENV['END_DATE'] ? ENV['END_DATE'].to_date : start_date
    Entity.import_range(entity,start_date..end_date)
  end

import_range.rb

  def self.import_range(entity,date_range)
    raise RuntimeErrror, "date_range must be a range" unless date_range.is_a?(Range)
    
    import_method = self.methods.select {|q| q if q.match(/import_#{entity}/)}[0]
    date_range.min.upto(date_range.max) do |i|
      self.send(import_method.to_sym,i)
    end
  end