Heavily simplified this route

Author: RitamNandi

src/services/stats/stats-router.test.ts

@@ -1020,22 +1020,23 @@ describe("GET /stats/attended-at-least/:N", () => {
         const eventC = { ...EVENT_3, eventId: uuidv4() };
         await SupabaseDB.EVENTS.insert([eventA, eventB, eventC]);
 
-        // Ritam attends 2 events
-        await SupabaseDB.EVENT_ATTENDANCES.insert([
-            { eventId: eventA.eventId, attendee: ATTENDEE_RITAM.userId },
-            { eventId: eventB.eventId, attendee: ATTENDEE_RITAM.userId },
-        ]);
-
-        // Nathan attends 3 events
-        await SupabaseDB.EVENT_ATTENDANCES.insert([
-            { eventId: eventA.eventId, attendee: ATTENDEE_NATHAN.userId },
-            { eventId: eventB.eventId, attendee: ATTENDEE_NATHAN.userId },
-            { eventId: eventC.eventId, attendee: ATTENDEE_NATHAN.userId },
-        ]);
-
-        // Timothy attends 1 event
-        await SupabaseDB.EVENT_ATTENDANCES.insert([
-            { eventId: eventA.eventId, attendee: ATTENDEE_TIMOTHY.userId },
+        await SupabaseDB.ATTENDEE_ATTENDANCES.insert([
+            {
+                userId: ATTENDEE_RITAM.userId,
+                eventsAttended: [eventA.eventId, eventB.eventId],
+            },
+            {
+                userId: ATTENDEE_NATHAN.userId,
+                eventsAttended: [
+                    eventA.eventId,
+                    eventB.eventId,
+                    eventC.eventId,
+                ],
+            },
+            {
+                userId: ATTENDEE_TIMOTHY.userId,
+                eventsAttended: [eventA.eventId],
+            },
         ]);
     });
 

src/services/stats/stats-router.ts

@@ -318,7 +318,7 @@ statsRouter.get(
     }
 );
 
-// Take in paramter n, return the number of attendees who attended at least n events
+// Take in parameter n, return the number of attendees who attended at least n events
 statsRouter.get(
     "/attended-at-least/:N",
     RoleChecker([Role.enum.STAFF], false),
@@ -339,21 +339,15 @@ statsRouter.get(
         const n = result.data.N;
 
         const { data: attendanceRecords } =
-            await SupabaseDB.EVENT_ATTENDANCES.select(
-                "attendee"
+            await SupabaseDB.ATTENDEE_ATTENDANCES.select(
+                "eventsAttended"
             ).throwOnError();
 
-        // Count occurrences of each attendee
-        const attendanceCountMap: Record<string, number> = {};
-        attendanceRecords?.forEach((record: { attendee: string }) => {
-            attendanceCountMap[record.attendee] =
-                (attendanceCountMap[record.attendee] || 0) + 1;
-        });
-
-        // Count how many attendees have attended at least n events
-        const countAtLeastN = Object.values(attendanceCountMap).filter(
-            (count) => count >= n
-        ).length;
+        const countAtLeastN =
+            attendanceRecords?.filter(
+                (record: { eventsAttended: string[] }) =>
+                    record.eventsAttended.length >= n
+            ).length ?? 0;
 
         return res.status(StatusCodes.OK).json({ count: countAtLeastN });
     }