[FIX] {test_}mail: remove activity assignation check

How to reproduce:
- Install hr with demo data
- Create a user without access to hr and turn it into an employee
- Create a user for Abigail
- Assign Abigail as manager of the new user
- Click on "onboarding plan" in the chatter of the new user
- Then in the dialog, click on "Schedule" button

You get the error "Assigned user test has no access to the document and is not
able to handle this activity." because the new user has no access to the record
employee on which those activities are scheduled.

As activities for which the user has no access to the underlying record are now
displayed in the systray (with no access to the record), we remove the check
that prevent assigning an activity to a user on a record he has no access to.

Technical note: before odoo/odoo#149965, activities scheduled manually were
created with the flag "automated" set to True and when this flag is set the
check that ensures that the user has access to the record is skipped. With
odoo/odoo#149965, as the "automated" flag is set to False when scheduling
activities manually, an error is trigerred if the user has no access to the
underlying record. Here we always skip that test and mark the method as
deprecated because the user can see the activity no matter the access he has on
the underlying record.

Task-3598836

closes odoo/odoo#155576

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/mail/models/mail_activity.py

@@ -260,9 +260,8 @@ class MailActivity(models.Model):
         # if available; otherwise fall back on read for read, write for other operations.
         activity_to_documents = dict()
         for activity in remaining_sudo:
-            # write / unlink: if not updating self or assigned, limit to automated activities to avoid
-            # updating other people's activities. As unlinking a document bypasses access rights checks
-            # on related activities this will not prevent people from deleting documents with activities
+            # write / unlink: As unlinking a document bypasses access rights checks on related activities
+            # this will not prevent people from deleting documents with activities
             # create / read: just check rights on related document
             activity_to_documents.setdefault(activity.res_model, list()).append(activity.res_id)
         for doc_model, doc_ids in activity_to_documents.items():
@@ -283,7 +282,12 @@ class MailActivity(models.Model):
         """ Check assigned user (user_id field) has access to the document. Purpose
         is to allow assigned user to handle their activities. For that purpose
         assigned user should be able to at least read the document. We therefore
-        raise an UserError if the assigned user has no access to the document. """
+        raise an UserError if the assigned user has no access to the document.
+
+        .. deprecated:: 17.0
+            Deprecated method, we don't check access to the underlying records anymore
+            as user can new see activities without having access to the underlying records.
+        """
         for model, activity_data in self._classify_by_model().items():
             # group activities / user, in order to batch the check of ACLs
             per_user = dict()
@@ -327,14 +331,10 @@ class MailActivity(models.Model):
             readable_user_partners = self.env.user.partner_id
 
         # when creating activities for other: send a notification to assigned user;
-        # in case of manually done activity also check target has rights on document
-        # otherwise we prevent its creation. Automated activities are checked since
-        # they are integrated into business flows that should not crash.
         if self.env.context.get('mail_activity_quick_update'):
             activities_to_notify = self.env['mail.activity']
         else:
             activities_to_notify = activities.filtered(lambda act: act.user_id != self.env.user)
-        activities_to_notify.filtered(lambda act: not act.automated)._check_access_assignation()
         if activities_to_notify:
             to_sudo = activities_to_notify.filtered(lambda act: act.user_id.partner_id not in readable_user_partners)
             other = activities_to_notify - to_sudo
@@ -370,8 +370,6 @@ class MailActivity(models.Model):
 
         if values.get('user_id'):
             if values['user_id'] != self.env.uid:
-                to_check = user_changes.filtered(lambda act: not act.automated)
-                to_check._check_access_assignation()
                 if not self.env.context.get('mail_activity_quick_update', False):
                     user_changes.action_notify()
             for activity in user_changes:

addons/test_mail/tests/test_mail_activity.py

@@ -124,15 +124,14 @@ class TestActivityRights(TestActivityCommon):
                     [('id', '=', test_activity.id)],
                     ['summary'])
 
-        # cannot create activities for people that cannot access record
+        # can create activities for people that cannot access record
         with patch.object(MailTestActivity, 'check_access_rights', autospec=True, side_effect=_employee_crash):
-            with self.assertRaises(exceptions.UserError):
-                activity = self.env['mail.activity'].create({
-                    'activity_type_id': self.env.ref('test_mail.mail_act_test_todo').id,
-                    'res_model_id': self.env.ref('test_mail.model_mail_test_activity').id,
-                    'res_id': self.test_record.id,
-                    'user_id': self.user_employee.id,
-                })
+            self.env['mail.activity'].create({
+                'activity_type_id': self.env.ref('test_mail.mail_act_test_todo').id,
+                'res_model_id': self.env.ref('test_mail.model_mail_test_activity').id,
+                'res_id': self.test_record.id,
+                'user_id': self.user_employee.id,
+            })
 
         # cannot create activities if no access to the document
         with patch.object(MailTestActivity, 'check_access_rights', autospec=True, side_effect=_employee_crash):