odoo/doc/howtos/backend/exercise-onchange

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# HG changeset patch
# Parent 8d5573b704b2867788dd6895503f1871c2976a29
# Parent 9eb163e5da677a0d09e01a354ba56697b576a4bc
diff --git a/openacademy/models.py b/openacademy/models.py
--- a/openacademy/models.py
+++ b/openacademy/models.py
@@ -39,3 +39,20 @@ class Session(models.Model):
r.taken_seats = 0.0
else:
r.taken_seats = 100.0 * len(r.attendee_ids) / r.seats
+
+ @api.onchange('seats', 'attendee_ids')
+ def _verify_valid_seats(self):
+ if self.seats < 0:
+ return {
+ 'warning': {
+ 'title': "Incorrect 'seats' value",
+ 'message': "The number of available seats may not be negative",
+ },
+ }
+ if self.seats < len(self.attendee_ids):
+ return {
+ 'warning': {
+ 'title': "Too many attendees",
+ 'message': "Increase seats or remove excess attendees",
+ },
+ }