mail_digest: fix behavior w/ `force_send` enabled

`force_send` is an option in `mail` core module
that allows to send an email immediately.

Handling the message w/ digest is wrong and in any case
we gonna have a digest w/out the message inside it
since is going to be deleted right after send.

A typical use case is the notification sent to new followers.

mail_digest/README.rst

@@ -42,6 +42,15 @@ Specifically:
 NOTE: under the hood the digest notification logic excludes followers to be notified,
 since you really want to notify only mail.digest's partner.
 
+NOTE 2: Odoo's mail machinery has an option `force_send`
+to send the email immediately without waiting for the mail queue to be processed.
+When this option is used the email is sent right away
+and the message record is deleted right after.
+
+A typical use case is the reset password mail.
+We assume that if you use that option you really want the email to go out "now"
+so when `force_send` is used, digest machinery is completely bypassed.
+
 
 Global settings
 ---------------

mail_digest/__manifest__.py

@@ -5,7 +5,7 @@
 {
     'name': 'Mail digest',
     'summary': """Basic digest mail handling.""",
-    'version': '10.0.1.0.1',
+    'version': '10.0.1.0.2',
     'license': 'AGPL-3',
     'author': 'Camptocamp,Odoo Community Association (OCA)',
     'website': 'https://github.com/OCA/social',

mail_digest/models/res_partner.py

@@ -89,7 +89,8 @@ class ResPartner(models.Model):
                 force_send=False, send_after_commit=True, user_signature=True):
         """Override to delegate domain generation."""
         # notify_by_email
-        email_domain = self._get_notify_by_email_domain(message)
+        email_domain = self._get_notify_by_email_domain(
+            message, force_send=force_send)
         # `sudo` from original odoo method
         # the reason should be that anybody can write messages to a partner
         # and you really want to find all ppl to be notified
@@ -97,9 +98,10 @@ class ResPartner(models.Model):
         partners._notify_by_email(
             message, force_send=force_send,
             send_after_commit=send_after_commit, user_signature=user_signature)
+        if not force_send:
             # notify_by_digest
             digest_domain = self._get_notify_by_email_domain(
-            message, digest=True)
+                message, force_send=force_send, digest=True)
             partners = self.sudo().search(digest_domain)
             partners._notify_by_digest(message)
 
@@ -127,10 +129,12 @@ class ResPartner(models.Model):
         self.env['mail.digest'].sudo().create_or_update(self, message)
 
     @api.model
-    def _get_notify_by_email_domain(self, message, digest=False):
+    def _get_notify_by_email_domain(self, message,
+                                    force_send=False, digest=False):
         """Return domain to collect partners to be notified by email.
 
         :param message: instance of mail.message
+        :param force_send: whether the message should be sent immediately
         :param digest: include/exclude digest enabled partners
 
         NOTE: since mail.mail inherits from mail.message
@@ -155,6 +159,8 @@ class ResPartner(models.Model):
             ('channel_ids', 'in', channels.ids),
             ('email', '!=', email)
         ]
+        if force_send:
+            return domain
         if not digest:
             domain.append(('notify_email', 'not in', ('none', 'digest')))
         else:

mail_digest/tests/test_partner_domains.py

@@ -91,6 +91,20 @@ class PartnerDomainCase(SavepointCase):
         domain = partner._get_notify_by_email_domain(message, digest=1)
         self._assert_found(domain)
 
+    def test_notify_domains_digest_force_send(self):
+        # when `force_send` is true, digest machinery is bypassed
+        message = self.message_model.create({'body': 'My Body', })
+        partner = self.partner1
+        partner.notify_email = 'digest'
+        # even if we have digest mode on, we find the guy
+        domain = partner._get_notify_by_email_domain(message, force_send=True)
+        self._assert_found(domain)
+        # when asking for digest domain we don't get digest-related leaves
+        # as digest domain part is bypassed
+        domain = partner._get_notify_by_email_domain(
+            message, force_send=True, digest=True)
+        self.assertNotIn('notify_email', [x[0] for x in domain])
+
     def test_notify_domains_none(self):
         message = self.message_model.create({'body': 'My Body', })
         partner = self.partner1