From 9de304432f8633b5a3d24102748f368555845ab1 Mon Sep 17 00:00:00 2001
From: Sivert <316918682+grytchat@users.noreply.github.com>
Date: Wed, 28 Oct 2026 12:59:46 +0100
Subject: [PATCH] fix: thread:history carries answer_message_id too

#348 added the answer to every summary built by toThreadSummary, but
thread:fetch builds its thread object by hand, so opening a solved topic
didn't show which reply answered it. Found checking the phone against it.

Part of GRYT-1963.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 src/socket/handlers/chat.ts              | 1 +
 src/socket/handlers/threadStatus.test.ts | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/src/socket/handlers/chat.ts b/src/socket/handlers/chat.ts
index c012e7a..de43cbb 100644
--- a/src/socket/handlers/chat.ts
+++ b/src/socket/handlers/chat.ts
@@ -1281,6 +1281,7 @@ export function registerChatHandlers(ctx: HandlerContext): EventHandlerMap {
             status: thread.status,
             reply_count: thread.reply_count,
             locked: thread.locked,
+            answer_message_id: thread.answer_message_id,
             created_at: thread.created_at.toISOString(),
             last_message_at: thread.last_message_at.toISOString(),
           },
diff --git a/src/socket/handlers/threadStatus.test.ts b/src/socket/handlers/threadStatus.test.ts
index 62600ce..9ef3efb 100644
--- a/src/socket/handlers/threadStatus.test.ts
+++ b/src/socket/handlers/threadStatus.test.ts
@@ -117,6 +117,10 @@ describe("marking which reply answered it", () => {
     assert.equal(upd.answer_message_id, reply.message_id);
     assert.equal((await getThread(threadId))?.answer_message_id, reply.message_id);
 
+    await alice.handlers["thread:fetch"]({ conversationId: FORUM, threadId });
+    const fetched = alice.received("thread:history").at(-1) as { thread: { answer_message_id: string | null } };
+    assert.equal(fetched.thread.answer_message_id, reply.message_id, "opening the topic has to show the answer too");
+
     await alice.handlers["thread:status:set"]({ conversationId: FORUM, threadId, status: "open", accessToken: alice.accessToken });
     assert.equal((await getThread(threadId))?.answer_message_id, null);
   });