[Action View] Don't create middleman `DetailsKey` instance

All of this is `nodoc`'ed, so we shouldn't have to worry about breaking
changes, if there are any -- all internal API :).

1 files changed, 3 insertions, 9 deletions

diff --git a/actionview/lib/action_view/lookup_context.rb b/actionview/lib/action_view/lookup_context.rb
index 626c4b8f5e..9db1460ee7 100644
--- a/actionview/lib/action_view/lookup_context.rb
+++ b/actionview/lib/action_view/lookup_context.rb
@@ -63,7 +63,7 @@ module ActionView
           details = details.dup
           details[:formats] &= Template::Types.symbols
         end
-        @details_keys[details] ||= new
+        @details_keys[details] ||= Concurrent::Map.new
       end
 
       def self.clear
@@ -71,13 +71,7 @@ module ActionView
       end
 
       def self.digest_caches
-        @details_keys.values.map(&:digest_cache)
-      end
-
-      attr_reader :digest_cache
-
-      def initialize
-        @digest_cache = Concurrent::Map.new
+        @details_keys.values
       end
     end
 
@@ -236,7 +230,7 @@ module ActionView
     end
 
     def digest_cache
-      details_key.digest_cache
+      details_key
     end
 
     def initialize_details(target, details)