Here's an example of doing yields in Ruby. The fail! and finished! methods set the state of the load in the DB and save the execution time

load.rb

  def self.audit(command = 'Load')
    unless block_given?
      raise ArgumentError, "You can only invoke audit with a block"
    end

    a = nil

    begin
      a = Load.create :command => command, :status => 'started', :start_time => Time.now
      yield a
      # rescue ActiveRecord::ActiveRecordError
      #   raise
    rescue Exception => e
      a.fail!(e)
    end

    a.finished!    
    a
  end