Add notification message

issue11065
review367951004

CHANGELOG

@@ -1,3 +1,4 @@
+* Support notification message
 * Use defusedxml to parse XML (11244)
 * Add support for Python 3.10
 * Remove support for Python 3.6

proteus/__init__.py

@@ -1172,6 +1172,10 @@ class Model(object):
             self._parent._changed.add(self._parent_field_name)
             self._parent._on_change([self._parent_field_name])
 
+    def notifications(self):
+        values = self._get_on_change_values()
+        return getattr(self._proxy, 'on_change_notify')(values, self._context)
+
 
 class Wizard(object):
     'Wizard class for Tryton wizards'