eiru_service/models/project_service.py

# -*- coding: utf-8 -*-
from openerp import models, fields, api, tools
from openerp.exceptions import ValidationError, except_orm, Warning, RedirectWarning

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

    name = fields.Many2one('product.service', string='Nombre', required=True) 
    date_start = fields.Date(string='Start Date')
    date_due = fields.Date(string='Expiration Date')
    sequence = fields.Integer(string='Sequence')
    partner_id =  fields.Many2one('res.partner', string='Customer')
    image_medium = fields.Binary('Binary File', related="name.logo")
    state = fields.Selection([('draft', 'Nuevo'),('open', 'En progreso'),
        ('cancelled', 'Cancelado'),
        ('pending', 'Pendiente'),
        ('close', 'Cerrado')],
        string='Status')
    color = fields.Integer(string='Color Index')
    project_service_task_ids = fields.One2many(
        'project.service.task',
        'project_id',
    )
    project_service_task_count = fields.Integer(
        string='Contador de tareas',
        compute='_get_project_service_task_count',
    )
    date_in = fields.Date(string='Fecha de entrada', default=fields.Date.today())
    date_out = fields.Date(string='Fecha de Salida')

    _defaults = {
        'state': 'open',
    }

    @api.multi
    def unlink(self):
        for project in self:
            if project.state in ('close'):
                raise Warning('No puedes borrar un proyecto en estado cerrado')
            if len(project.project_service_task_ids) > 0:
                raise Warning('No puedes borrar un proyecto que tiene tareas')
        return super(ProjectService, self).unlink()

    def on_change_product(self):
        if not self.name:
            return {}
        model = self.pool.get('product.service').browse(self.name)
        return {
            'value': {
                'image_medium': model.logo,
            }
        }

    @api.one
    @api.depends('project_service_task_ids')
    def _get_project_service_task_count(self):
        self.project_service_task_count = len(self.project_service_task_ids)

    @api.one 
    @api.onchange('name')
    def onchange_name(self):
        self.partner_id = self.name.partner_id.id