登録されるとつらいユーザー名を禁止するRails Validator

ban_reserved_validator.rb

class BanReservedValidator < ActiveModel::EachValidator

  WORDS = %w{
    index home top help about security contact support faq form mail
    update mobile tour plan price business company store shop term
    privacy rule inquiry legal policy image css stylesheet src js
    javascript asset account user item entry article event doc word
    product download video community blog site popular i my me topic
    news info status search explore share feature upload rss widget
    api wiki auth session register login logout signup signin signout
    root postmaster webmaster show create edit update destroy new
    dashboard recruit join offer career corp school dev test bug code
    guest web root info admin guest delete remove www null 0 default
    empty page app archive bookmark captcha comment jump maintenance
    profile premium ranking setting source tool tag api rpc id reset
    post member connect self notify read recent recently bot game
    special forum category report secure contribute howto usage feed
    contest ad service system sys official message msg project new
    old first last photo config log analysis design theme lang language
    tutorial repository purpose query start get spec call phone manual
    owner license calendar organization develop developer asct book
    friend portal share group dic dict dictionary pr press release version
    error diary state graph watch infomation navi navigation site sitemap
    cart gift alpha beta tux year wiki private analytics public static
    img style script file flash swf dist xml svg cgi atom forgot server
    cgi-bin server-status balancer-manager icon ldap-status server-info svn
  }

  def validate_each(record, attribute, value)
    if (WORDS + WORDS.map {|w| w.pluralize}).include?(value)
      record.errors[attribute] <<
        (options[:message] || I18n.t('activerecord.errors.messages.reserved'))
    end
  end

end