[FIX] website_event: set utm values for event registrations

The utm parameters i.e. utm_source, utm_campaign, utm_medium, are only set
when a sale order is attached to an event registration. If no sale order is
generated the event registration won't have any source despite it being
accessed via a campaign.

Reproduction steps:
1. Create an event and copy its website link.
2. Go to link tracker and create a tracked link with utm values filled.
3. Use this tracked link in incognito preferably to register for the event.
4. Check the attendees of the event and check the marketing utm values.

The registration has no campaign. When it should have one.

This is because event.registration mistakenly does not inherit from
the utm mixin. The fix is to call the default_get of the mixin
as it is independant from any field defined in the mixin.

OPW-3222179
task-3458877

closes odoo/odoo#151047

X-original-commit: 06803bc12115ccb2afb7ea7b8dd101e3a75bfb67
Signed-off-by: Warnon Aurélien (awa) <awa@odoo.com>
Signed-off-by: Renaud Thiry (reth) <reth@odoo.com>

addons/event/models/event_registration.py

@@ -86,6 +86,18 @@ class EventRegistration(models.Model):
         registrations_confirmed.event_id._check_seats_availability()
         registrations_confirmed.event_ticket_id._check_seats_availability()
 
+    def default_get(self, fields):
+        ret_vals = super().default_get(fields)
+        utm_mixin_fields = ("campaign_id", "medium_id", "source_id")
+        utm_fields = ("utm_campaign_id", "utm_medium_id", "utm_source_id")
+        if not any(field in utm_fields for field in fields):
+            return ret_vals
+        utm_mixin_defaults = self.env['utm.mixin'].default_get(utm_mixin_fields)
+        for (mixin_field, field) in zip(utm_mixin_fields, utm_fields):
+            if field in fields and utm_mixin_defaults.get(mixin_field):
+                ret_vals[field] = utm_mixin_defaults[mixin_field]
+        return ret_vals
+
     @api.depends('partner_id')
     def _compute_name(self):
         for registration in self:

addons/website_event/tests/test_website_event.py

@@ -4,16 +4,54 @@
 from datetime import datetime, timedelta
 from dateutil.relativedelta import relativedelta
 
-from odoo import fields
+from odoo import fields, http
 from odoo.addons.base.tests.common import HttpCaseWithUserDemo, HttpCaseWithUserPortal
 from odoo.addons.mail.tests.common import mail_new_test_user
 from odoo.addons.website.tests.test_base_url import TestUrlCommon
-from odoo.addons.website_event.tests.common import OnlineEventCase
+from odoo.addons.website_event.tests.common import TestEventOnlineCommon, OnlineEventCase
 from odoo.exceptions import AccessError
-from odoo.tests import tagged
+from odoo.tests import HttpCase, tagged
 from odoo.tools import mute_logger
 from odoo.tests.common import users
 
+class TestEventRegisterUTM(HttpCase, TestEventOnlineCommon):
+    def test_event_registration_utm_values(self):
+        self.event_0.registration_ids.unlink()
+        self.event_0.write({
+            'event_ticket_ids': [
+                (5, 0),
+                (0, 0, {
+                    'name': 'First Ticket',
+                }),
+            ],
+            'is_published': True
+        })
+        event_campaign = self.env['utm.campaign'].create({'name': 'utm event test'})
+
+        self.authenticate(None, None)
+        self.opener.cookies.update({
+            'odoo_utm_campaign': event_campaign.name,
+            'odoo_utm_source': self.env.ref('utm.utm_source_newsletter').name,
+            'odoo_utm_medium': self.env.ref('utm.utm_medium_email').name
+        })
+        event_questions = self.event_0.question_ids
+        name_question = event_questions.filtered(lambda q: q.question_type == 'name')
+        email_question = event_questions.filtered(lambda q: q.question_type == 'email')
+        self.assertTrue(name_question and email_question)
+        # get 1 free ticket
+        self.url_open(f'/event/{self.event_0.id}/registration/confirm', data={
+            f'1-name-{name_question.id}': 'Bob',
+            f'1-email-{email_question.id}': 'bob@test.lan',
+            '1-event_ticket_id': self.event_0.event_ticket_ids[0].id,
+            'csrf_token': http.Request.csrf_token(self),
+        })
+        new_registration = self.event_0.registration_ids
+        self.assertEqual(len(new_registration), 1)
+        self.assertEqual(new_registration.utm_campaign_id, event_campaign)
+        self.assertEqual(new_registration.utm_source_id, self.env.ref('utm.utm_source_newsletter'))
+        self.assertEqual(new_registration.utm_medium_id, self.env.ref('utm.utm_medium_email'))
+
+
 @tagged('post_install', '-at_install')
 class TestUi(HttpCaseWithUserDemo, HttpCaseWithUserPortal):