Blah blah STI

gistfile1.rb

class Result
  # Possible attributes:
  #   seller_name: String, nil
  #   title      : String, nil
  #   description: String
  #   price      : Decimal

  def human_readable_on_base
    str = if self.title
            "#{self.title} "
          else
            ''
          end
    str += if self.seller_name
             if str.length > 0
               " by #{self.seller_name}: "
             else
               "#{self.seller_name}: "
             end
           else
             ": "
           end
    str + price.to_s
  end
end

class Site1Result < Result
  # From Site1, we get all fields
  def human_readable
    "#{self.title} by #{self.seller_name}: #{self.price.to_s}"
  end
end

class Site2Result < Result
  # Site2 does not provide a seller_name
  def human_readable
    "#{self.title}: #{self.price.to_s}"
  end
end

class Site3Result < Result
  # Site3 does not provide a title.
  def human_readable
    "#{self.seller_name}: #{self.price.to_s}"
  end
end