ico-validator

Ruby validator for format of Czech company identification number - ICO

Contains:

1. Standalone ruby validator
2. Rails ActiveModel::EachValidator
3. JS validator

What is validated:

1. ICO length - must be exactly 8 characters
2. ICO must contain only numbers
3. ICO number must satisfy last digit control formula

Ruby validator is one simple module with only one public method IcoValidation.valid_ico? which returns true or false.

require 'ico_validator'

IcoValidation.valid_ico?('12345678') # invalid ico
=> false

IcoValidation.valid_ico?('27169278')
=> true

Rails validator is implemented as ActiveModel::EachValidator. So it's easy to use within your AR models:

class Company < ActiveRecord::Base
  validates :ico, ico: true
end

If validation doesn't pass it adds :invalid_format error on validated attribute.

ico-validator is Rails engine, so if you want to validate ico with javascript just add following to application.js

//= require ico-validator

And then on any field you want to be validated with JS:

<%= form_for(...) do |f| %>
  <%= f.text_field :ico, class: 'ico-validate' %>
<% end %>

jQuery will bind validations there.