FIX: auditlog consistency with Many2one fields

Odoo allows creating or updating records with values like ``{"many2one_field_id": empty.recordset()}``,
but this crashes when using ``deepcopy``, which fails in recreating the ``api.Environment`` object
attached to the recordset.
This commit should fix the issue by updating the values before passing them to ``deepcopy``.

auditlog/models/rule.py

@@ -311,6 +311,7 @@ class AuditlogRule(models.Model):
         def create_fast(self, vals_list, **kwargs):
             self = self.with_context(auditlog_disabled=True)
             rule_model = self.env["auditlog.rule"]
+            vals_list = rule_model._update_vals_list(vals_list)
             vals_list2 = copy.deepcopy(vals_list)
             new_records = create_fast.origin(self, vals_list, **kwargs)
             new_values = {}
@@ -715,3 +716,15 @@ class AuditlogRule(models.Model):
             if act_window:
                 act_window.unlink()
         return self.write({"state": "draft"})
+
+    @api.model
+    def _update_vals_list(self, vals_list):
+        # Odoo supports empty recordset assignment (while it doesn't handle
+        # non-empty recordset ¯\_(ツ)_/¯ ), it could be an Odoo issue, but in
+        # the meanwhile we have to handle this case to avoid errors when using
+        # ``deepcopy`` to log data.
+        for vals in vals_list:
+            for fieldname, fieldvalue in vals.items():
+                if isinstance(fieldvalue, models.BaseModel) and not fieldvalue:
+                    vals[fieldname] = False
+        return vals_list

auditlog/tests/test_auditlog.py

@@ -10,39 +10,17 @@ from odoo.addons.base.models.ir_model import MODULE_UNINSTALL_FLAG
 class AuditlogCommon(object):
     def test_LogCreation(self):
         """First test, caching some data."""
-
         self.groups_rule.subscribe()
-
-        auditlog_log = self.env["auditlog.log"]
         group = self.env["res.groups"].create({"name": "testgroup1"})
-        self.assertTrue(
-            auditlog_log.search(
+        self.assertEqual(
+            self.env["auditlog.log"].search_count(
                 [
                     ("model_id", "=", self.groups_model_id),
                     ("method", "=", "create"),
                     ("res_id", "=", group.id),
                 ]
-            ).ensure_one()
-        )
-        group.write({"name": "Testgroup1"})
-        self.assertTrue(
-            auditlog_log.search(
-                [
-                    ("model_id", "=", self.groups_model_id),
-                    ("method", "=", "write"),
-                    ("res_id", "=", group.id),
-                ]
-            ).ensure_one()
-        )
-        group.unlink()
-        self.assertTrue(
-            auditlog_log.search(
-                [
-                    ("model_id", "=", self.groups_model_id),
-                    ("method", "=", "unlink"),
-                    ("res_id", "=", group.id),
-                ]
-            ).ensure_one()
+            ),
+            1,
         )
 
     def test_LogCreation2(self):
@@ -193,6 +171,93 @@ class AuditlogCommon(object):
         if self.groups_rule.capture_record:
             self.assertTrue(len(log_record.line_ids) > 0)
 
+    def test_LogCreation7(self):
+        """Seventh test: multi-create with different M2O values.
+
+        Check that creation goes as planned (no error coming from ``deepcopy``)
+        """
+        self.groups_rule.subscribe()
+
+        auditlog_log = self.env["auditlog.log"]
+        cat = self.env["ir.module.category"].create({"name": "Test Category"})
+        groups_vals = [
+            {"name": "testgroup1"},
+            {"name": "testgroup3", "category_id": cat.browse()},
+            {"name": "testgroup2", "category_id": False},
+            {"name": "testgroup4", "category_id": cat.id},
+        ]
+        groups = self.env["res.groups"].create(groups_vals)
+
+        # Ensure ``category_id`` field has the correct values
+        expected_ids = [False, False, False, cat.id]
+        self.assertEqual([g.category_id.id for g in groups], expected_ids)
+
+        # Ensure the correct number of logs have been created
+        logs = auditlog_log.search(
+            [
+                ("model_id", "=", self.groups_model_id),
+                ("method", "=", "create"),
+                ("res_id", "in", groups.ids),
+            ]
+        )
+        self.assertEqual(len(logs), len(groups))
+
+    def test_LogUpdate(self):
+        """Tests write results with different M2O values."""
+        self.groups_rule.subscribe()
+        group = self.env["res.groups"].create({"name": "testgroup1"})
+        cat = self.env["ir.module.category"].create({"name": "Test Category"})
+        group.write(
+            {
+                "name": "Testgroup1",
+                "category_id": cat.browse(),
+            }
+        )
+        log1 = self.env["auditlog.log"].search(
+            [
+                ("model_id", "=", self.groups_model_id),
+                ("method", "=", "write"),
+                ("res_id", "=", group.id),
+            ]
+        )
+        self.assertEqual(len(log1), 1)
+        group.write({"name": "Testgroup2", "category_id": cat.id})
+        log2 = self.env["auditlog.log"].search(
+            [
+                ("model_id", "=", self.groups_model_id),
+                ("method", "=", "write"),
+                ("res_id", "=", group.id),
+                ("id", "not in", log1.ids),
+            ]
+        )
+        self.assertEqual(len(log2), 1)
+        group.write({"name": "Testgroup3", "category_id": False})
+        log3 = self.env["auditlog.log"].search(
+            [
+                ("model_id", "=", self.groups_model_id),
+                ("method", "=", "write"),
+                ("res_id", "=", group.id),
+                ("id", "not in", (log1 + log2).ids),
+            ]
+        )
+        self.assertEqual(len(log3), 1)
+
+    def test_LogDelete(self):
+        """Tests unlink results"""
+        self.groups_rule.subscribe()
+        group = self.env["res.groups"].create({"name": "testgroup1"})
+        group.unlink()
+        self.assertEqual(
+            self.env["auditlog.log"].search_count(
+                [
+                    ("model_id", "=", self.groups_model_id),
+                    ("method", "=", "unlink"),
+                    ("res_id", "=", group.id),
+                ]
+            ),
+            1,
+        )
+
 
 class TestAuditlogFull(TransactionCase, AuditlogCommon):
     def setUp(self):