Contents

# frozen_string_literal: true

class IsbnValidator < ActiveModel::EachValidator

  CHARACTERS ||= %w[0 1 2 3 4 5 6 7 8 9 0 x].freeze

  def validate_each(record, attribute, value)
    return if valid?(value.to_s)
    record.errors[attribute] <<
      (options[:message] || I18n.t('active_validation.errors.messages.isbn'))
  end

  private

  def valid_format?(value)
    return(false) if value.empty?
    value = value.gsub(/-| /, '').downcase.chars

    [10, 13].include?(value.size) && value.all? { |chr| CHARACTERS.include?(chr) }
  end

  def valid_length?(value)
    value.present?
  end

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

end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
active_validation-5.0.0	lib/active_validation/validators/isbn_validator.rb
active_validation-4.1.0	lib/active_validation/validators/isbn_validator.rb