通过单独count和distinct的方式获取帖子列表的参与人数

app/service/forumThreadService.js

@@ -819,7 +819,7 @@ function getSubThreads(doc, sort, callback) {
         } else {
             var lastResult = results[2];
             lastResult.subThreads.docTotal = results[1] || 0;
-            lastResult.subThreads.total = results[0];
+            lastResult.subThreads.total = results[0].size();
             callback(null, lastResult);
         }
     });