Contents

class SedolValidator < ActiveModel::EachValidator

  def validate_each(record, attribute, value)
    unless valid?(value.to_s)
      record.errors[attribute] << options.fetch(:message, I18n.t("active_validation.errors.messages.sedol"))
    end
  end

  private

  def valid_checksum?(value)
    digits = value.chars.map { |d| d.match(/[A-Z]/) ? (d.ord - 55) : d.to_i }
    weights = [1, 3, 1, 7, 3, 9, 1]

    total = 0
    digits.each_with_index { |d, i| total += (weights[i] * d) }

    (10 - total % 10) % 10
  end

  def valid_format?(value)
    value =~ /^([A-Z0-9]{6})(\d{1})$/
  end

  def valid_length?(value)
    value.present?
  end

  def valid?(value)
    valid_length?(value) && valid_format?(value) && valid_checksum?(value)
  end

end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
active_validation-3.0.0	lib/active_validation/validators/sedol_validator.rb