Rails IBAN validator based on iban-tools gem

Add it to your Gemfile:

gem 'validates_iban_format_of'

# I18n locales are loaded automatically.

class BankAccount < ActiveRecord::Base
  validates_iban_format_of :iban, message_for_invalid: 'is not incorrect', message_for_missing: 'is blank'

  # OR
  # validates :iban, iban_format: { message_for_invalid: 'is not incorrect', message_for_missing: 'is blank' }
end

require "validates_iban_format_of/rspec_matcher"

describe Person do
  it { should validate_iban_format_of(:iban).with_message('is not looking good') }
end

:message_for_invalid
   String. A custom error message when the iban is invalid (default is: "is invalid")

:message_for_missing
   String. A custom error message when the iban is missing (default is: "is missing")

:optional
   Boolean. Flag to turn off valdiation for blank/nil case

:generate_message
  Boolean. Return the I18n key of the error message instead of the error message itself (default is false)

:on, :if, :unless, :allow_nil, :allow_blank, :strict
   Standard ActiveModel validation options.  These work in the ActiveModel/ActiveRecord/Rails syntax only.
   See http://api.rubyonrails.org/classes/ActiveModel/Validations/ClassMethods.html#method-i-validates for details.

To execute the unit tests run rspec.

Written by Dimitar Kostov mitko.kostov@gmail.com

Many thanks to the iban-tools gem for the real validation

Copyright (c) 2017 Dimitar Kostov

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.