From cdf1d67d0fed44e233f26f87641601b968aaddd7 Mon Sep 17 00:00:00 2001
From: Hugo Sales <hugo@hsal.es>
Date: Sat, 8 Jan 2022 17:13:08 +0000
Subject: [PATCH] [CORE][Cache] Workaround to redis not allowing empty lists

---
 src/Core/Cache.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Core/Cache.php b/src/Core/Cache.php
index cb1a5a6636..2e5a47fbdf 100644
--- a/src/Core/Cache.php
+++ b/src/Core/Cache.php
@@ -242,7 +242,7 @@ abstract class Cache
     public static function getList(string $key, callable $calculate, string $pool = 'default', ?int $max_count = null, ?int $left = null, ?int $right = null, float $beta = 1.0): array
     {
         if (isset(self::$redis[$pool])) {
-            return self::redisMaybeRecompute(
+            $result = self::redisMaybeRecompute(
                 $key,
                 recompute: /**
                  * Caculate and trim the list to the correct size
@@ -268,6 +268,7 @@ abstract class Cache
                 pool: $pool,
                 beta: $beta,
             );
+            return empty($result) ? [] : $result; // TODO may be wrong? not sure
         } else {
             return self::get(
                 $key,
@@ -295,7 +296,7 @@ abstract class Cache
     {
         if (isset(self::$redis[$pool])) {
             if (empty($value)) {
-                self::$redis[$pool]->del($key); // Redis doesn't support empty lists
+                self::$redis[$pool]->set($key, []);
             } else {
                 self::$redis[$pool] // Ensure atomic
                     ->multi(Redis::MULTI)