domain-fields

class CalculoPapelProducto(ModelSQL, ModelView):
    'Modelo Wizard Calculo Papel'
    _name = 'sale_imprenta.producto'

    #Campos definidos en modelo product.template
    orientacion = fields.Selection([
            ('H', 'Horizontal'),
            ('V', 'Vertical'),
            ], u'Orientación')
    cantidad_hojas_necesarias = fields.Integer('Cantidad de Hojas')
    desperdicio = fields.Numeric('Desperdicio', digits=(3, 2))
    paginas_por_hoja = fields.Integer('Paginas por Hoja')
    name = fields.Char('Name', size=None, translate=True,
        select=True)
    producto = fields.Many2One('product.template', 'Producto',
            select=True)
    height = fields.Float('Height', digits=(16, 2))
    width = fields.Float('Width', digits=(16, 2))
    id_wizard = fields.Integer('id del wizard')

CalculoPapelProducto()


class CalculoPapelStart(ModelView):
    'Modelo Wizard Calculo Papel'
    _name = 'sale_imprenta.calculo.papel.start'

    producto_papel = fields.Many2One('sale_imprenta.producto',u'Papel',
                        domain=[('id_wizard', '=', Get(Eval('context', {}), 'active_id', '0'))],
                        required=False
                        )
   #######
   ## The domain it's not working :(
CalculoPapelStart()

class CalculoPapel(Wizard):
    'Wizard Calcular Papel'
    _name = 'sale_imprenta.calculo.papel'

    start = StateView('sale_imprenta.calculo.papel.start',
    'sale_imprenta.calculo_papel_start_view_form', [
    Button('Cancelar', 'end', 'tryton-cancel'),
    Button('Siguiente', 'buscar_papel', 'tryton-go-next', True),
    ])

    buscar_papel = StateTransition()

    seleccion = StateView('sale_imprenta.calculo.papel.start',
    'sale_imprenta.calculo_papel_seleccion_view_form', [
    Button('Cancelar', 'end', 'tryton-cancel'),
    Button('Atras', 'volver_start', 'tryton-go-previous'),
    Button('Finalizar', 'terminar', 'tryton-ok', True),
    ])

    volver_start = StateTransition()
    terminar = StateTransition()

    def transition_buscar_papel(self, session):
        return 'seleccion'

    def default_seleccion(self, session, fields):
        res = {}
        pool = Pool()
        wiz_obj = pool.get('sale_imprenta.calculo.papel.start')

        t = Transaction()
        id_wizard = t.context.get('active_id')

        producto_wiz_obj = pool.get('sale_imprenta.producto')
        producto_wiz_obj.create({'name':'Basura '+ str(id_wizard), 'id_wizard': id_wizard})

        return res

    def default_start(self, session, fields):
        return session.data['start']

    def transition_volver_start(self, session):
        return 'start'

    def transition_terminar(self, session):
        return 'end'

CalculoPapel()