from odoo import api, fields, models, _


class PurchaseOrder(models.Model):
    _inherit = 'purchase.order'

    state = fields.Selection([
        ('draft', '询价'),
        ('sent', '发送询价'),
        ('to approve', '待批准'),
        ("approved", "已批准"),
        ('purchase', '采购订单'),
        ('done', '完成'),
        ('cancel', '取消'),
        ('rejected', '已驳回')
    ], string='Status', readonly=True, index=True, copy=False, default='draft', tracking=True)