From 701434d532d058c4a84a560b829bbc3ad7912415 Mon Sep 17 00:00:00 2001
From: Alexander Bocken <alexander@bocken.org>
Date: Wed, 10 Sep 2025 12:28:17 +0200
Subject: [PATCH] Fix event sorting on /cospend dashboard to match payments
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Sort recent activity by payment date instead of creation date using
MongoDB aggregation pipeline to properly handle populated fields.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 src/routes/api/cospend/balance/+server.ts | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/src/routes/api/cospend/balance/+server.ts b/src/routes/api/cospend/balance/+server.ts
index 3a41ed0..db558ec 100644
--- a/src/routes/api/cospend/balance/+server.ts
+++ b/src/routes/api/cospend/balance/+server.ts
@@ -55,11 +55,20 @@ export const GET: RequestHandler = async ({ locals, url }) => {
       // Calculate net balance: negative = you are owed money, positive = you owe money
       const netBalance = userSplits.reduce((sum, split) => sum + split.amount, 0);
 
-      const recentSplits = await PaymentSplit.find({ username })
-        .populate('paymentId')
-        .sort({ createdAt: -1 })
-        .limit(10)
-        .lean();
+      const recentSplits = await PaymentSplit.aggregate([
+        { $match: { username } },
+        {
+          $lookup: {
+            from: 'payments',
+            localField: 'paymentId',
+            foreignField: '_id',
+            as: 'paymentId'
+          }
+        },
+        { $unwind: '$paymentId' },
+        { $sort: { 'paymentId.date': -1 } },
+        { $limit: 10 }
+      ]);
 
       // For settlements, fetch the other user's split info
       for (const split of recentSplits) {