# HG changeset patch
# Parent 7a7d003fe38426a405ce0657a627a139133ec4dd

Index: doc-backend/openacademy/course.py
===================================================================
--- doc-backend.orig/openacademy/course.py	2014-08-22 17:02:00.987103191 +0200
+++ doc-backend/openacademy/course.py	2014-08-22 17:02:00.983103191 +0200
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from openerp import api, fields, models
+from openerp import api, fields, models, exceptions
 
 class Course(models.Model):
     _name = 'openacademy.course'
@@ -56,3 +56,9 @@
                 },
             }
 
+    @api.one
+    @api.constrains('instructor_id', 'attendee_ids')
+    def _check_instructor_not_in_attendees(self):
+        if self.instructor_id and self.instructor_id in self.attendee_ids:
+            raise exceptions.ValidationError("A session's instructor can't be an attendee")
+