core: discussion views (fix #69)

packages/hydrooj/src/handler/discussion.ts

@@ -187,6 +187,12 @@ class DiscussionDetailHandler extends DiscussionHandler {
             if (drdoc.reply) uids.push(...drdoc.reply.map((drrdoc) => drrdoc.owner));
         }
         const udict = await user.getList(domainId, uids);
+        if (!dsdoc.view) {
+            await Promise.all([
+                discussion.inc(domainId, did, 'views', 1),
+                discussion.setStatus(domainId, did, this.user._id, { view: true }),
+            ]);
+        }
         const path = [
             ['Hydro', 'homepage'],
             ['discussion_main', 'discussion_main'],