an_option.rb

def valid_score_method
  if score_as_multi?
    unless valid_scoring_for_multi
      self.errors[:base] << "Score Method must be None, Sum or Max for Checkbox or Select-multiple tags"
      return false
    end
  elsif score_as_text?
    unless valid_scoring_for_text?
      self.errors[:base] << "Score Method must be None, TextCompletion or TextNumeric for Text or Textarea tags"
      return false
    end
  else
    unless valid_scoring_for_generic?
      self.errors[:base] << "Score Method #{score_method} invalid for tag #{answer_tag}"
      return false
    end
  end
end

private

def score_as_multi?
  answer_type_in?(['checkbox', 'select-multiple'])
end

def score_as_text?
  answer_type_in?(['text', 'textarea'])
end

def answer_type_in?(valid_types)
  valid_types.include?(answer_tag.downcase)
end

def valid_scoring_for_multi?
  score_method_in?(['sum', 'max', 'none'])
end

def valid_scoring_for_text?
  score_method_in?('textcontains', 'textnumeric', 'none')
end

def valid_scoring_for_generic?
  score_method_in?('value', 'none')
end

def score_method_in?(valid_score_methods)
  valid_score_methods.include?(score_method.downcase)
end