Load seen time in the same query as tickets

Use left join to load related TicketSeen objects along with Tickets
instead of doing a query per ticket when rendering.

todosrht/blueprints/tracker.py

@@ -10,13 +10,14 @@ from todosrht.search import apply_search
 from todosrht.types import TicketSubscription
 from todosrht.types import Event, EventType, EventNotification
 from todosrht.types import Tracker, Ticket, TicketStatus, TicketAccess
-from todosrht.types import Label, TicketLabel
+from todosrht.types import Label, TicketLabel, TicketSeen
 from todosrht.urls import tracker_url
 from srht.config import cfg
 from srht.database import db
 from srht.flask import paginate_query, loginrequired
 from srht.validation import Validation
 from datetime import datetime
+from sqlalchemy import and_
 
 tracker = Blueprint("tracker", __name__)
 
@@ -97,7 +98,14 @@ def return_tracker(tracker, access, **kwargs):
         ).one_or_none()
         is_subscribed = bool(sub)
 
-    tickets = Ticket.query.filter(Ticket.tracker_id == tracker.id)
+    tickets = (db.session
+        .query(Ticket, TicketSeen)
+        .filter(Ticket.tracker_id == tracker.id)
+        .outerjoin(TicketSeen, and_(
+            TicketSeen.ticket_id == Ticket.id,
+            TicketSeen.user == current_user,
+        )))
+
     search = request.args.get("search")
     tickets = tickets.order_by(Ticket.updated.desc())
     if search:

todosrht/templates/tracker.html

@@ -136,7 +136,7 @@
       </form>
       {% if len(tickets) %}
       <div class="ticket-list">
-        {% for ticket in tickets %}
+        {% for ticket, seen in tickets %}
         <div class="id">
           <a href="{{ ticket|ticket_url }}">#{{ticket.scoped_id}}</a>
         </div>
@@ -154,7 +154,7 @@
             {{ ticket.submitter }}
           </a>
         </div>
-        {% if ticket.new_updates(current_user) %}
+        {% if seen and seen.last_view >= ticket.updated %}
         <div class="comments">
           {{icon("comments-o")}}
           {{ ticket.comments | length }}

todosrht/types/ticket.py

@@ -51,14 +51,3 @@ class Ticket(Base):
 
     view_list = sa.orm.relationship("TicketSeen")
     labels = sa.orm.relationship("Label", secondary="ticket_label")
-
-    def new_updates(self, user):
-        if not user:
-            return None
-        seen = (TicketSeen.query
-                .filter(TicketSeen.user_id == user.id,
-                    TicketSeen.ticket_id == self.id)
-                .one_or_none())
-        if seen:
-            return seen.last_view >= self.updated
-        return None