class Shoulda::ActiveRecord::Matchers::HaveDbColumnMatcher

def correct_scale?
  return true if @scale.nil?
  if matched_column.scale.to_s == @scale.to_s
    true
  else
    @missing = "#{model_class} has a db column named #{@column} " <<
               "of scale #{matched_column.scale}, not #{@scale}."
    false
  end
end