Merge pull request #22193 from grosser/grosser/multi

call local_cache 1 time instead of 3 times

activesupport/lib/active_support/cache/strategy/local_cache.rb

@@ -102,10 +102,10 @@ def decrement(name, amount = 1, options = nil) # :nodoc:
 
         protected
           def read_entry(key, options) # :nodoc:
-            if local_cache
-              local_cache.fetch(key) do
+            if cache = local_cache
+              cache.fetch(key) do
                 entry = super
-                local_cache.write_entry(key, entry, options)
+                cache.write_entry(key, entry, options)
                 entry
               end
             else