add unread count to topnav and update subscription on thread view

app/routes/threads.py

@@ -1,6 +1,6 @@
 from flask import Blueprint, redirect, url_for, render_template, request, abort
 from functools import wraps
-from ..auth import login_required, get_active_user
+from ..auth import login_required, get_active_user, is_logged_in
 from ..models import Threads, Posts, Topics, Users, Reactions, Subscriptions
 from ..util import get_form_checkbox, time_now
 import math
@@ -59,6 +59,11 @@ def thread(thread_id, slug):
             abort(404)
     posts = thread.get_posts(PER_PAGE, page)
     last_post = posts[-1]
+    user = get_active_user()
+    if user:
+        subscription = Subscriptions.find({'user_id': user.id, 'thread_id': thread.id})
+        if subscription:
+            subscription.update({'last_seen': last_post['created_at']})
     return render_template(
         'threads/thread.html', thread=thread,
         posts=posts, page=page,