_form.erb

<%= error_messages_for 'type' %>

<div class="box">
 <p>
    <%= f.text_field :descrizione, :label=>l(:label_descrizione), :required => true-%>
 </p>
 <p>
    <%= f.text_field 'figlia_di', :label=>l(:label_parent) -%>
 </p>
 <p>
    <%= f.text_field :riferimento, :label=>l(:label_riferimento), :required => true  %>
 </p>


</div>

gistfile2.txt

new.erb

<h2><%=l(:label_type)%></h2>

<% labelled_tabular_form_for :type, @type, :url => {:action => 'create' } do |f| %>
<%= render :partial => 'form', :locals => { :f => f } %>


<%= submit_tag l(:button_create) %>

<% end %>

type_custom_fields.rb

class TypeCustomFields < ActiveRecord::Base
  
  validates_presence_of :descrizione
  validates_presence_of :riferimento
  
   def self.findAll
     TypeCustomFields.find(:all)
   end

end

type_custom_fields_controller.rb

class TypeCustomFieldsController < ApplicationController
  
      def new
        @type = TypeCustomFields.new
      end
  
    def create
      @type = TypeCustomFields.new(params[:typeCustomFields])
      if @type.save
        flash[:notice] = l(:notice_successful_create)
        redirect_to :controller => 'type_custom_fields', :action => 'settings'
       else
         render :action => 'new'
      end
    end


  def edit
    if request.post? and @type.update_attributes(params[:descrizione]) and  @type.update_attributes(params[:riferimento])
      flash[:notice] = l(:notice_successful_update)
      redirect_to :controller => 'type_custom_fields', :action => 'settings'
    end
  end


  def settings
     respond_to do |format|
        format.html { render :template => ' settings/redmine_linked_custom_fields_settings', :layout => !request.xhr? }
   end
  end
end