Rails - May 2011 - YML to ActiveRecord

Hello I''m trying to load a yaml to a activerecord object.
The method ''salvar_datos'' save the data to a yaml file.
The method ''cargar_datos'' load the data from a yaml file.

When I call ''salvar_datos'' all go fine, but when I run
''cargar_datos''
a
exception is throw

`attribute_names'': undefined method `keys'' for nil:NilClass
(NoMethodError) ......

The problem is around     ''roles = YAML.load(archivo)''

require ''rubygems''
require ''active_record''

class Rol < ActiveRecord::Base
end

  ActiveRecord::Base.establish_connection( :adapter =>
''postgresql'', :host => ''localhost'',
:username => ''postgres'', :database
=> ''mi_bd'', :port => ''5432'');

  def salvar_datos

    roles = Rol.all

    archivo =
File.open(''/home/aconsuegra/Escritorio/salida.yml'',''w'')
    YAML.dump(roles,archivo)
    archivo.close

  end

  def cargar_datos

    archivo =
File.open(''/home/aconsuegra/Escritorio/salida.yml'')
    roles = YAML.load(archivo)
    archivo.close

    roles.each do |un_rol|
      un_rol.save

    end

  end

#puts roles

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.