from odoo import api, fields, models


class SaleOrder(models.Model):
    _inherit = 'sale.order'

    delivery_time = fields.Integer(
        string='Delivery Time',
        default=45,
    )
    # Extend default field
    payment_term_id = fields.Many2one(
        'account.payment.term',
        domain=lambda self: [('id', 'in', self._get_payment_terms())]
    )

    @api.multi
    def _get_payment_terms(self):
        ref = self.env.ref
        terms = (
            ref('client_contracts.payment_term_prepaid').id,
            ref('client_contracts.payment_term_postpayment').id,
            ref('client_contracts.payment_term_partial_2').id,
            ref('client_contracts.payment_term_partial_3').id,
        )
        return terms