From 9d42119a0989d6edfba53c5ba0e29bd71305beb8 Mon Sep 17 00:00:00 2001
From: cuom1999 <lephuocdinh99@gmail.com>
Date: Tue, 21 Feb 2023 14:13:37 -0600
Subject: [PATCH] Fix hash

---
 judge/ml/collab_filter.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/judge/ml/collab_filter.py b/judge/ml/collab_filter.py
index 512c747..f06637f 100644
--- a/judge/ml/collab_filter.py
+++ b/judge/ml/collab_filter.py
@@ -41,7 +41,7 @@ class CollabFilter:
 
     def user_recommendations(self, user, problems, measure=DOT, limit=None, **kwargs):
         uid = user.id
-        problems_hash = hashlib.sha1(str(problems).encode()).hexdigest()
+        problems_hash = hashlib.sha1(str(list(problems)).encode()).hexdigest()
         cache_key = ":".join(map(str, [self.name, uid, measure, limit, problems_hash]))
         value = cache.get(cache_key)
         if value: