how to display openerp error message

Question

In my student module I inherited res.partner. And I want to restrict to modify name in partner view if partner is a student. here is my cord.

from openerp.osv import osv, fields


class res_partner(osv.Model):
    _inherit = 'res.partner'
    _columns = {
        'name': fields.char('Name', size=250, required=True, select=True),
        'is_student': fields.boolean('Student', readonly=True),
}

def write(self, cr, uid, ids, vals, context=None):

    stud = self.browse(cr, uid, ids, context=context)[0]

    if ('name' in vals) & (stud.is_student is True):
        raise "Cannot Edit"
    else:
        return super(res_partner, self).write(cr, uid, ids, vals, context=context)

it is working but I want to display error message in a message box. not a exception. How could I do this?

Answer 1

raise osv.except_osv(('Error'), ('Error  Cannot Edit'))

Answer 2

Regarding @Damian's answer, osv.except_osv is marked in the source as deprecated but hasn't actually been deprecated yet as it is still in a lot of Odoo code. There is a newer openerp.exceptions.except_orm and the even newer Warning. Confusing to say the least.

Also, don't forget to translate. Using except_orm as an example.

from openerp.exceptions import except_orm
from openerp.tools.translate import _

raise osv.except_osv(_('Error!'), _("Something bad happened."))

or:

from openerp import _
from openerp.exceptions import Warning

raise Warning(_('Something bad happened.'))