class AlfaData < ActiveRecord::Base
  belongs_to :alfa

  def before(what)
    self.send( "#{what}_före" )
  end
end

-----
module ApplicationHelper
  def icontable( ds1, ds2, names )
    alfa = ""
    Mci.new.send( names ).each do |v|
      alfa += iconbox(v, ds1.send(v), ds2.send(v)) unless ['kampanj'].include?(v)
    end
    return alfa
  end
end
-----
erb:

icontable( ds1.method(:before), ds1.method(:after), 'pres' )

----

Controller:
ds1=Alfa.first.dataset
ds2=Alfa.last.dataset

---

Previously this was in the model too:

  def after(&block)
    lambda { |what| self.send( "#{what}_efter" ) }
  end

didn't work either