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-rw-r--r--lib/PublicInbox/Inbox.pm2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/PublicInbox/Inbox.pm b/lib/PublicInbox/Inbox.pm
index a1a072ad..5a22e40d 100644
--- a/lib/PublicInbox/Inbox.pm
+++ b/lib/PublicInbox/Inbox.pm
@@ -429,4 +429,6 @@ sub on_unlock {
 
 sub uidvalidity  { $_[0]->{uidvalidity} //= $_[0]->mm->created_at }
 
+sub eidx_key { $_[0]->{newsgroup} // $_[0]->{inboxdir} }
+
 1;