Caching: MemCache and Redis stores use local cache for multi-reads

Fixes #31909.
Closes #31911.

1 files changed, 17 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/cache/strategy/local_cache.rb b/activesupport/lib/active_support/cache/strategy/local_cache.rb
index aaa9638fa8..e17308f83e 100644
--- a/activesupport/lib/active_support/cache/strategy/local_cache.rb
+++ b/activesupport/lib/active_support/cache/strategy/local_cache.rb
@@ -54,6 +54,10 @@ module ActiveSupport
             @data[key]
           end
 
+          def read_multi_entries(keys, options)
+            Hash[keys.map { |name| [name, read_entry(name, options)] }.keep_if { |_name, value| value }]
+          end
+
           def write_entry(key, value, options)
             @data[key] = value
             true
@@ -116,6 +120,19 @@ module ActiveSupport
             end
           end
 
+          def read_multi_entries(keys, options)
+            return super unless local_cache
+
+            local_entries = local_cache.read_multi_entries(keys, options)
+            missed_keys = keys - local_entries.keys
+
+            if missed_keys.any?
+              local_entries.merge!(super(missed_keys, options))
+            else
+              local_entries
+            end
+          end
+
           def write_entry(key, entry, options)
             if options[:unless_exist]
               local_cache.delete_entry(key, options) if local_cache