# -*- coding: utf-8 -*- 
# Part of Odoo. See LICENSE file for full copyright and licensing details. 
from odoo import api, fields, models 
from datetime import datetime 

class dha(models.Model): 
    _name = 'vanphongpham.dha'


    ds_vpp = fields.One2many(comodel_name="vanphongpham.dha.detail", inverse_name="dsdmvpp", string="Required")

    @api.onchange("ds_vpp")
    def summoney(self):
        for line in self.ds_vpp:
            print line.amount
            tada = line.dsdmvpp # not show result
            for oke in tada:
                print oke.gia_ca_vpp

class dhadtl(models.Model):
    _name = 'vanphongpham.dha.detail'

    #book_load = fields.Many2one("vanphongpham.dha", "Phieu muon", required=True)
    
    dsdmvpp = fields.Many2one("product.product", "List stationery", required=True)
    amount = fields.Integer(string='Amount', required=True, default='1')
   
How to get value sale price from  in "summoney"?
Thanks in advance!