attr_accessor

new.html.erb

<%- model_class = @auth_user.class -%>
<div class="page-header">
  <h1><%=t '.title', :default => t('helpers.titles.new', :model => model_class.model_name.human,
                                 :default => "New #{model_class.model_name.human}") %></h1>
</div>
<%= simple_form_for([:auth,@auth_user]) do |f| %>
  <%= f.error_notification %>

  <div class="form-inputs">
    <%= f.input :username %>
    <%= f.input :email %>
    <!--%= f.input :confirmation_now, :as => :radio_buttons, :checked => @auth_user.confirmed? ? "true" : "false" %-->
    <%= f.input :confirmation_now, :as => :boolean, :input_html => {:value =>  @auth_user.confirmed? ? true : false} %>
    <%= f.input :password, :as => :password %>
    <%= f.input :password_confirmation %>

    <%= f.association :cms_roles, :as => :check_boxes, :collection => CmsRole.all(:order => 'name'), :checked => ( @auth_user.cms_roles.map(&:id) if @auth_user.cms_roles.present?) %>

  </div>

  <div class="form-actions">
    <%= f.button :submit, :class => 'btn-primary', :disable_with => 'loading...' %>
    <%= link_to t('.cancel', :default => t("helpers.links.cancel")),
                auth_users_path, :class => 'btn' %>
  </div>
<% end %>

user.rb

# encoding: utf-8
class User < ActiveRecord::Base
  attr_accessor :agree, :confirmation_now
  validates_acceptance_of :agree, :message => I18n.t("must_be_agree")
  #validates_acceptance_of :confirmation_now


  attr_accessible :email, :password, :password_confirmation,
             :remember_me, :username, :login, :agree,:cms_role_ids,
             :permit_ids, :confirmation_now

  before_save :if_confirmation_now

  def if_confirmation_now
    if self.confirmation_now.present?
      self.skip_confirmation! if ["true","1",1,true].include? self.confirmation_now
    else
      self.confirmation_now = nil
    end
  end
end