correctly accumulate sync summaries.

if a sync summary for (say) invited_member_count goes from 1 to 0, it should be accumluated as 0, rather than 1. Should fix element-hq/element-web#23345
matrix-org · May 16, 2023 · 18722d0 · 18722d0
1 parent 5119934
commit 18722d0
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diff --git a/spec/unit/sync-accumulator.spec.ts b/spec/unit/sync-accumulator.spec.ts
@@ -545,6 +545,23 @@ describe("SyncAccumulator", function () {
             expect(summary["m.heroes"]).toEqual(["@bob:bar"]);
         });
 
+        it("should reset summary properties", function () {
+            sa.accumulate(
+                createSyncResponseWithSummary({
+                    "m.heroes": ["@alice:bar"],
+                    "m.invited_member_count": 2,
+                }),
+            );
+            sa.accumulate(
+                createSyncResponseWithSummary({
+                    "m.heroes": ["@alice:bar"],
+                    "m.invited_member_count": 0,
+                }),
+            );
+            const summary = sa.getJSON().roomsData.join["!foo:bar"].summary;
+            expect(summary["m.invited_member_count"]).toEqual(0);
+        });
+
         it("should return correctly adjusted age attributes", () => {
             const delta = 1000;
             const startingTs = 1000;

diff --git a/src/sync-accumulator.ts b/src/sync-accumulator.ts
@@ -399,9 +399,9 @@ export class SyncAccumulator {
 
             const acc = currentData._summary;
             const sum = data.summary;
-            acc[HEROES_KEY] = sum[HEROES_KEY] || acc[HEROES_KEY];
-            acc[JOINED_COUNT_KEY] = sum[JOINED_COUNT_KEY] || acc[JOINED_COUNT_KEY];
-            acc[INVITED_COUNT_KEY] = sum[INVITED_COUNT_KEY] || acc[INVITED_COUNT_KEY];
+            acc[HEROES_KEY] = sum[HEROES_KEY] ?? acc[HEROES_KEY];
+            acc[JOINED_COUNT_KEY] = sum[JOINED_COUNT_KEY] ?? acc[JOINED_COUNT_KEY];
+            acc[INVITED_COUNT_KEY] = sum[INVITED_COUNT_KEY] ?? acc[INVITED_COUNT_KEY];
         }
 
         // We purposefully do not persist m.typing events.