Object.get_or_create: merge repeated fields instead of overwriting

models.py

@@ -1132,6 +1132,11 @@ class Object(StringIdModel):
 
         if set(props.keys()) & set(('as2', 'bsky', 'mf2', 'raw')):
             obj.clear()
+
+        # merge repeated fields
+        for field in 'feed', 'copies', 'labels', 'notify', 'users':
+            getattr(obj, field).extend(props.pop(field, []))
+
         obj.populate(**{
             k: v for k, v in props.items()
             if v and not isinstance(getattr(Object, k), ndb.ComputedProperty)

protocol.py

@@ -933,7 +933,11 @@ class Protocol:
             error(f'Actor {actor} is opted out or blocked', status=204)
 
         # write Object to datastore
-        orig_props = obj.to_dict()
+        orig_props = {
+            **obj.to_dict(),
+            # structured properties
+            'copies': obj.copies,
+        }
         obj = Object.get_or_create(id, new=obj.new, changed=obj.changed,
                                    authed_as=actor, **orig_props)
 

tests/test_models.py

@@ -637,11 +637,23 @@ class ObjectTest(TestCase):
         obj7 = Object.get_or_create('http://b.ee/ff', as2={'a': 'b'}, mf2={'c': 'd'},
                                     source_protocol='web')
         Object.get_or_create('http://b.ee/ff', authed_as='http://b.ee/ff',
-                             users=[ndb.Key(Web, 'me')])
+                             users=[ndb.Key(Web, 'me')], labels=['feed'],
+                             copies=[Target(protocol='ui', uri='http://foo')])
         self.assert_object('http://b.ee/ff', as2={'a': 'b'}, mf2={'c': 'd'},
-                           users=[ndb.Key(Web, 'me')],
+                           users=[ndb.Key(Web, 'me')], labels=['feed'],
+                           copies=[Target(protocol='ui', uri='http://foo')],
                            source_protocol='web')
 
+        # repeated properties should merge, not overwrite
+        Object.get_or_create('http://b.ee/ff', authed_as='http://b.ee/ff',
+                             users=[ndb.Key(Web, 'you')], labels=['user'],
+                             copies=[Target(protocol='ui', uri='http://bar')])
+        self.assert_object('http://b.ee/ff', as2={'a': 'b'}, mf2={'c': 'd'},
+                           users=[ndb.Key(Web, 'me'), ndb.Key(Web, 'you')],
+                           labels=['feed', 'user'], source_protocol='web',
+                           copies=[Target(protocol='ui', uri='http://foo'),
+                                   Target(protocol='ui', uri='http://bar')])
+
     def test_get_or_create_auth_check(self):
         Object(id='fake:foo', our_as1={'author': 'fake:alice'},
                source_protocol='fake').put()