IsbnValidation

Custom ActiveRecord Validation for International Standard Book Number (ISBN) fields. Supports both ISBN-10 and ISBN-13. Will guarantee that validated fields contain valid ISBNs.

Default behaviour is to allow either ISBN-10 or ISBN-13, but this can be altered by specifying the :with option as shown in the example below.

For more information on ISBN, see http://en.wikipedia.org/wiki/Isbn

To use it, add it to your Gemfile:

gem 'isbn_validation'

The current version of isbn_validation only supports Rails 3+. For Rails 2.x support, please use v0.1.2.

class Book < ActiveRecord::Base
  validates :isbn,   :isbn_format => true
  validates :isbn10, :isbn_format => { :with => :isbn10 }
  validates :isbn13, :isbn_format => { :with => :isbn13 }
end

Copyright © 2015 Nick Plante, released under the MIT license