Catches exception thrown when boosting unknown statuses

bookwyrm/activitypub/base_activity.py

@@ -3,7 +3,7 @@ from dataclasses import dataclass, fields, MISSING
 from json import JSONEncoder
 
 from django.apps import apps
-from django.db import transaction
+from django.db import IntegrityError, transaction
 
 from bookwyrm.connectors import ConnectorException, get_data
 from bookwyrm.tasks import app
@@ -92,7 +92,10 @@ class ActivityObject:
 
         with transaction.atomic():
             # we can't set many to many and reverse fields on an unsaved object
+            try:
                 instance.save()
+            except IntegrityError as e:
+                raise ActivitySerializerError(e)
 
             # add many to many fields, which have to be set post-save
             for field in instance.many_to_many_fields:

bookwyrm/tests/test_incoming.py

@@ -8,6 +8,7 @@ from django.http import HttpResponseBadRequest, HttpResponseNotAllowed, \
         HttpResponseNotFound
 from django.test import TestCase
 from django.test.client import RequestFactory
+import responses
 
 from bookwyrm import models, incoming
 
@@ -421,6 +422,25 @@ class Incoming(TestCase):
         self.assertEqual(notification.related_status, self.status)
 
 
+    @responses.activate
+    def test_handle_discarded_boost(self):
+        ''' test a boost of a mastodon status that will be discarded '''
+        activity = {
+            'type': 'Announce',
+            'id': 'http://www.faraway.com/boost/12',
+            'actor': self.remote_user.remote_id,
+            'object': self.status.to_activity(),
+        }
+        responses.add(
+            responses.GET,
+            'http://www.faraway.com/boost/12',
+            json={'id': 'http://www.faraway.com/boost/12'},
+            status=200)
+        incoming.handle_boost(activity)
+        self.assertEqual(models.Boost.objects.count(), 0)
+
+
+
     def test_handle_unboost(self):
         ''' undo a boost '''
         activity = {