Fallback to title if title assignment invalid

src/documents/consumer.py

@@ -726,12 +726,17 @@ class Consumer(LoggingMixin):
 
         storage_type = Document.STORAGE_TYPE_UNENCRYPTED
 
+        title = file_info.title[:127]
+        if self.override_title is not None:
+            try:
+                title = self._parse_title_placeholders(self.override_title)
+            except Exception:
+                self.log.error(
+                    f"Error occurred parsing title override '{self.override_title}', falling back to original",
+                )
+
         document = Document.objects.create(
-            title=(
-                self._parse_title_placeholders(self.override_title)
-                if self.override_title is not None
-                else file_info.title
-            )[:127],
+            title=title,
             content=text,
             mime_type=mime_type,
             checksum=hashlib.md5(self.working_copy.read_bytes()).hexdigest(),

src/documents/signals/handlers.py

@@ -570,6 +570,7 @@ def run_workflow(
                     document.owner = action.assign_owner
 
                 if action.assign_title is not None:
+                    try:
                         document.title = parse_doc_title_w_placeholders(
                             action.assign_title,
                             document.correspondent.name
@@ -578,10 +579,17 @@ def run_workflow(
                             document.document_type.name
                             if document.document_type is not None
                             else "",
-                        document.owner.username if document.owner is not None else "",
-                        timezone.localtime(document.added),
+                            document.owner.username
+                            if document.owner is not None
+                            else "",
+                            document.added,
                             document.original_filename,
-                        timezone.localtime(document.created),
+                            document.created,
+                        )
+                    except Exception:
+                        logger.error(
+                            f"Error occurred parsing title assignment '{action.assign_title}', falling back to original",
+                            extra={"group": logging_group},
                         )
 
                 if (

src/documents/tests/test_consumer.py

@@ -423,6 +423,16 @@ class TestConsumer(DirectoriesMixin, FileSystemAssertsMixin, TestCase):
         self.assertEqual(document.title, "Override Title")
         self._assert_first_last_send_progress()
 
+    def testOverrideTitleInvalidPlaceholders(self):
+        with self.assertLogs("paperless.consumer", level="ERROR") as cm:
+            document = self.consumer.try_consume_file(
+                self.get_test_file(),
+                override_title="Override {correspondent]",
+            )
+            self.assertEqual(document.title, "sample")
+            expected_str = "Error occurred parsing title override 'Override {correspondent]', falling back to original"
+            self.assertIn(expected_str, cm.output[0])
+
     def testOverrideCorrespondent(self):
         c = Correspondent.objects.create(name="test")
 

src/documents/tests/test_workflows.py

@@ -966,6 +966,50 @@ class TestWorkflows(DirectoriesMixin, FileSystemAssertsMixin, APITestCase):
             expected_str = f"Document correspondent {doc.correspondent} does not match {trigger.filter_has_correspondent}"
             self.assertIn(expected_str, cm.output[1])
 
+    def test_document_added_invalid_title_placeholders(self):
+        """
+        GIVEN:
+            - Existing workflow with added trigger type
+            - Assign title field has an error
+        WHEN:
+            - File that matches is added
+        THEN:
+            - Title is not updated, error is output
+        """
+        trigger = WorkflowTrigger.objects.create(
+            type=WorkflowTrigger.WorkflowTriggerType.DOCUMENT_ADDED,
+            filter_filename="*sample*",
+        )
+        action = WorkflowAction.objects.create(
+            assign_title="Doc {created_year]",
+        )
+        w = Workflow.objects.create(
+            name="Workflow 1",
+            order=0,
+        )
+        w.triggers.add(trigger)
+        w.actions.add(action)
+        w.save()
+
+        now = timezone.localtime(timezone.now())
+        created = now - timedelta(weeks=520)
+        doc = Document.objects.create(
+            original_filename="sample.pdf",
+            title="sample test",
+            content="Hello world bar",
+            created=created,
+        )
+
+        with self.assertLogs("paperless.handlers", level="ERROR") as cm:
+            document_consumption_finished.send(
+                sender=self.__class__,
+                document=doc,
+            )
+            expected_str = f"Error occurred parsing title assignment '{action.assign_title}', falling back to original"
+            self.assertIn(expected_str, cm.output[0])
+
+        self.assertEqual(doc.title, "sample test")
+
     def test_document_updated_workflow(self):
         trigger = WorkflowTrigger.objects.create(
             type=WorkflowTrigger.WorkflowTriggerType.DOCUMENT_UPDATED,