class Shoulda::Matchers::ActiveRecord::HaveDbColumnMatcher

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