eiru_salon_spa/models/project_service_activity.py

# -*- coding: utf-8 -*-
from openerp import fields, models, api

class ProjectServiceActivity(models.Model):
    _name = 'project.service.activity'

    name=fields.Char('Nombre', compute='_get_product_name')
    product_id = fields.Many2one('product.product', string='Planned work', domain=[('type', '=', 'service'),('sale_ok','=',True)])
    time_spent = fields.Float(string='Estimated Time')
    work_date = fields.Datetime(string='Date')
    user_id = fields.Many2one('res.users', string='Responsible')
    task_id = fields.Many2one('project.service.task', string="Work id")
    work_cost = fields.Float(string="Service Cost")
    duration = fields.Float(string='Duration')
    completed = fields.Boolean(string="Completed")

    _defaults = {
        'user_id': lambda obj, cr, uid, ctx=None: uid,
        'work_date': fields.datetime.now(),
    }

    @api.onchange('product_id')
    def get_price(self):
        self.work_cost = self.product_id.lst_price

    api.one
    @api.depends('task_id','product_id')
    def _get_product_name(self):
        self.name = self.task_id.name + ' / ' +  self.product_id.name