From b37d908879e80b81616c3e9a9f92d968d5c327de Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C4=93teris=20Caune?= <cuu508@gmail.com>
Date: Sat, 20 Jul 2019 12:17:00 +0300
Subject: [PATCH] Optimization: don't instantiate Flip objects in
 Check.downtimes()

---
 hc/api/models.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hc/api/models.py b/hc/api/models.py
index d3f648b6..d7e11e39 100644
--- a/hc/api/models.py
+++ b/hc/api/models.py
@@ -265,8 +265,9 @@ class Check(models.Model):
 
         # A list of flips and month boundaries
         events = [(b, "---") for b in boundaries]
-        for flip in self.flip_set.filter(created__gt=min(boundaries)):
-            events.append((flip.created, flip.old_status))
+        q = self.flip_set.filter(created__gt=min(boundaries))
+        for pair in q.values_list("created", "old_status"):
+            events.append(pair)
 
         # Iterate through flips and month boundaries in reverse order,
         # and for each "down" event increase the counters in `totals`.