core: limit ranking to joined users

packages/hydrooj/src/handler/domain.ts

@@ -26,7 +26,7 @@ class DomainRankHandler extends Handler {
     @query('page', Types.PositiveInt, true)
     async get(domainId: string, page = 1) {
         const [dudocs, upcount, ucount] = await this.paginate(
-            domain.getMultiUserInDomain(domainId, { uid: { $gt: 1 }, rp: { $gt: 0 } }).sort({ rp: -1 }),
+            domain.getMultiUserInDomain(domainId, { uid: { $gt: 1 }, rp: { $gt: 0 }, join: true }).sort({ rp: -1 }),
             page,
             'ranking',
         );