add unread count to thread title in topic view

app/routes/topics.py

@@ -1,6 +1,7 @@
 from flask import Blueprint, redirect, url_for, render_template, request, session, abort
 
-from ..models import Topics, Threads
+from ..models import Topics, Threads, Subscriptions
+from ..auth import get_active_user
 import math
 
 bp = Blueprint('topics', __name__, url_prefix = '/topics/')
@@ -33,7 +34,15 @@ def topic(topic_id, slug):
         page = max(1, min(int(request.args.get('page', default=1)), page_count))
     except ValueError:
         abort(404)
-    return render_template('topics/topic.html', topic=topic, threads=topic.get_threads(PER_PAGE, page, sort_by), sort_by=sort_by, page=page, page_count=page_count)
+    threads = topic.get_threads(PER_PAGE, page, sort_by)
+    subscriptions = {}
+    user = get_active_user()
+    if user:
+        for thread in threads:
+            subscription = Subscriptions.find({'user_id': user.id, 'thread_id': thread['id']})
+            if subscription:
+                subscriptions[thread['id']] = subscription.get_unread_count()
+    return render_template('topics/topic.html', topic=topic, threads=threads, sort_by=sort_by, page=page, page_count=page_count, subscriptions=subscriptions)
 
 @bp.get('/<int:topic_id>/feed.atom/')
 def feed(topic_id):