eiru_payment_term_configurator/models/accont_payments_term_config.py

# -*- coding: utf-8 -*-
from openerp import models, fields, tools, api
import openerp.addons.decimal_precision as dp

class AccontPaymentsTermConfig(models.Model):
    _name = 'accont.payments.term.config'

    name = fields.Char('Name', required=True, readonly=True)
    interest_rate = fields.Float('Tasa de interés', digits=(3,6), digits_compute=dp.get_precision('Interest'), required=True, help="Tasa de interés %")
    message_default = fields.Char('Message', default='La tasa de interés por defecto es 4% mensual, tasa diaria (4 / 30 = 0,1333).')
    compute =  fields.Boolean(help="Indica si sera calculado los interés")
    comment = fields.Text('Comment', help="Información adicional")

    @api.model
    def _create_default_config(self):
        config = {
            'name': 'Interés por cambio de fecha de cuota',
            'interest_rate': '0.1333',
            'compute': True,
        }

        termConfig = self.env['accont.payments.term.config'].search([('name','=', config['name'])])
        if (not termConfig):
            self.env['accont.payments.term.config'].create({
                'name':  config['name'],
                'interest_rate': config['interest_rate'],
                'compute': config['compute'],
            })


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

    is_interest =  fields.Boolean('Is Interest',default=False)