class Shoulda::Matchers::ActiveRecord::HaveDbColumnMatcher

def correct_scale?
  return true unless @options.key?(:scale)
  if actual_scale.to_s == @options[:scale].to_s
    true
  else
    @missing = "#{model_class} has a db column named #{@column} "
    @missing << "of scale #{actual_scale}, not #{@options[:scale]}."
    false
  end
end