Redis fetch without names returns {}

When trying to call mget in Redis without any
parameters, a Redis error is thrown. To avoid
this, we circumvent Redis entirely when there
are no key names given.

1 files changed, 1 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/cache/redis_cache_store.rb b/activesupport/lib/active_support/cache/redis_cache_store.rb
index 9a55e49e27..87f9aa5346 100644
--- a/activesupport/lib/active_support/cache/redis_cache_store.rb
+++ b/activesupport/lib/active_support/cache/redis_cache_store.rb
@@ -361,6 +361,7 @@ module ActiveSupport
         def read_multi_mget(*names)
           options = names.extract_options!
           options = merged_options(options)
+          return {} if names == []
 
           keys = names.map { |name| normalize_key(name, options) }