[FIX] event: access issue for event admin to event templates

addons/event/models/event_mail.py

@@ -11,6 +11,8 @@
 from odoo import api, fields, models, tools
 from odoo.tools import exception_to_unicode
 from odoo.tools.translate import _
+from odoo.exceptions import UserError
+
 
 _logger = logging.getLogger(__name__)
 
@@ -67,6 +69,19 @@ def _prepare_event_mail_values(self):
             'template_ref': '%s,%i' % (self.template_ref._name, self.template_ref.id)
         }
 
+    @api.onchange('notification_type')
+    def set_template_ref_model(self):
+        notification_model = self.template_model_id.model
+        model = self.env[notification_model]
+        try:
+            model.search_count([('model', '=', 'event.registration')])
+            exists = model.search([('model', '=', 'event.registration')], limit=1)
+            if exists:
+                self.template_ref = "{},{}".format(notification_model, exists.id)
+        except:
+            raise UserError(
+                _("There is no template data relevant to the notification type."))
+
 
 class EventMailScheduler(models.Model):
     """ Event automated mailing. This model replaces all existing fields and

addons/event/views/event_views.xml

@@ -55,7 +55,7 @@
                                    <tree string="Communication" editable="bottom">
                                        <field name="notification_type"/>
                                        <field name="template_model_id" invisible="1"/>
-                                       <field name="template_ref" options="{'model_field': 'template_model_id', 'no_quick_create': True}" context="{'filter_template_on_event': True, 'default_model': 'event.registration'}"/>
+                                       <field name="template_ref" options="{'hide_model': True, 'no_quick_create': True}" context="{'filter_template_on_event': True, 'default_model': 'event.registration'}"/>
                                        <field name="interval_nbr" attrs="{'readonly':[('interval_unit', '=', 'now')]}"/>
                                        <field name="interval_unit"/>
                                         <field name="interval_type"/>