Fix rejecting duplicated bites

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

lib/pleroma/web/activity_pub/utils.ex

@@ -971,6 +971,7 @@ def fetch_latest_bite(
     |> maybe_exclude_activity_id(exclude_activity)
     |> Activity.Queries.by_object_id(bitten_ap_id)
     |> order_by([activity], fragment("? desc nulls last", activity.id))
+    |> exclude_rejected()
     |> limit(1)
     |> Repo.one()
   end
@@ -981,4 +982,13 @@ defp maybe_exclude_activity_id(query, %Activity{id: activity_id}) do
     query
     |> where([a], a.id != ^activity_id)
   end
+
+  defp exclude_rejected(query) do
+    rejected_activities = "Reject"
+    |> Activity.Queries.by_type()
+    |> select([a], fragment("?->>'object'", a.data))
+
+    query
+    |> where([a], fragment("?->>'id'", a.data) not in subquery(rejected_activities))
+  end
 end