3 files changed, 46 insertions, 9 deletions

diff --git a/actionview/lib/action_view/lookup_context.rb b/actionview/lib/action_view/lookup_context.rb
index c3bb0a49fc..61fe11cf45 100644
--- a/actionview/lib/action_view/lookup_context.rb
+++ b/actionview/lib/action_view/lookup_context.rb
@@ -58,22 +58,32 @@ module ActionView
       alias :eql? :equal?
 
       @details_keys = Concurrent::Map.new
+      @digest_cache = Concurrent::Map.new
 
-      def self.get(details)
+      def self.digest_cache(details)
+        @digest_cache[details_cache_key(details)] ||= Concurrent::Map.new
+      end
+
+      def self.details_cache_key(details)
         if details[:formats]
           details = details.dup
           details[:formats] &= Template::Types.symbols
         end
-        @details_keys[details] ||= Concurrent::Map.new
+        @details_keys[details] ||= Object.new
       end
 
       def self.clear
+        ActionView::ViewPaths.all_view_paths.each do |path_set|
+          path_set.each(&:clear_cache)
+        end
+        ActionView::LookupContext.fallbacks.each(&:clear_cache)
         @view_context_class = nil
         @details_keys.clear
+        @digest_cache.clear
       end
 
       def self.digest_caches
-        @details_keys.values
+        @digest_cache.values
       end
 
       def self.view_context_class(klass)
@@ -88,7 +98,7 @@ module ActionView
       # Calculate the details key. Remove the handlers from calculation to improve performance
       # since the user cannot modify it explicitly.
       def details_key #:nodoc:
-        @details_key ||= DetailsKey.get(@details) if @cache
+        @details_key ||= DetailsKey.details_cache_key(@details) if @cache
       end
 
       # Temporary skip passing the details_key forward.
@@ -102,7 +112,8 @@ module ActionView
     private
 
       def _set_detail(key, value) # :doc:
-        @details = @details.dup if @details_key
+        @details = @details.dup if @digest_cache || @details_key
+        @digest_cache = nil
         @details_key = nil
         @details[key] = value
       end
@@ -178,7 +189,7 @@ module ActionView
         user_details = @details.merge(options)
 
         if @cache
-          details_key = DetailsKey.get(user_details)
+          details_key = DetailsKey.details_cache_key(user_details)
         else
           details_key = nil
         end
@@ -205,7 +216,7 @@ module ActionView
           end
 
           if @cache
-            [details, DetailsKey.get(details)]
+            [details, DetailsKey.details_cache_key(details)]
           else
             [details, nil]
           end
@@ -236,6 +247,7 @@ module ActionView
 
     def initialize(view_paths, details = {}, prefixes = [])
       @details_key = nil
+      @digest_cache = nil
       @cache = true
       @prefixes = prefixes
       @rendered_format = nil
@@ -245,7 +257,7 @@ module ActionView
     end
 
     def digest_cache
-      details_key
+      @digest_cache ||= DetailsKey.digest_cache(@details)
     end
 
     def initialize_details(target, details)
diff --git a/actionview/lib/action_view/rendering.rb b/actionview/lib/action_view/rendering.rb
index cf7d1105e0..da92ce1f5e 100644
--- a/actionview/lib/action_view/rendering.rb
+++ b/actionview/lib/action_view/rendering.rb
@@ -87,6 +87,7 @@ module ActionView
 
     # Returns an object that is able to render templates.
     def view_renderer # :nodoc:
+      # Lifespan: Per controller
       @_view_renderer ||= ActionView::Renderer.new(lookup_context)
     end
 
diff --git a/actionview/lib/action_view/view_paths.rb b/actionview/lib/action_view/view_paths.rb
index d5694d77f4..3ca5aedc14 100644
--- a/actionview/lib/action_view/view_paths.rb
+++ b/actionview/lib/action_view/view_paths.rb
@@ -5,13 +5,21 @@ module ActionView
     extend ActiveSupport::Concern
 
     included do
-      class_attribute :_view_paths, default: ActionView::PathSet.new.freeze
+      ViewPaths.set_view_paths(self, ActionView::PathSet.new.freeze)
     end
 
     delegate :template_exists?, :any_templates?, :view_paths, :formats, :formats=,
              :locale, :locale=, to: :lookup_context
 
     module ClassMethods
+      def _view_paths
+        ViewPaths.get_view_paths(self)
+      end
+
+      def _view_paths=(paths)
+        ViewPaths.set_view_paths(self, paths)
+      end
+
       def _prefixes # :nodoc:
         @_prefixes ||= begin
           return local_prefixes if superclass.abstract?
@@ -29,6 +37,22 @@ module ActionView
         end
     end
 
+    # :stopdoc:
+    @all_view_paths = {}
+
+    def self.get_view_paths(klass)
+      @all_view_paths[klass] || get_view_paths(klass.superclass)
+    end
+
+    def self.set_view_paths(klass, paths)
+      @all_view_paths[klass] = paths
+    end
+
+    def self.all_view_paths
+      @all_view_paths.values.uniq
+    end
+    # :startdoc:
+
     # The prefixes used in render "foo" shortcuts.
     def _prefixes # :nodoc:
       self.class._prefixes