Merge pull request #42779 from jhawthorn/faster_template_lookups

Speed up template lookups by avoiding splats and ===

actionview/lib/action_view/lookup_context.rb

@@ -122,21 +122,29 @@ module ViewPaths
       attr_reader :view_paths, :html_fallback_for_js
 
       def find(name, prefixes = [], partial = false, keys = [], options = {})
-        @view_paths.find(*args_for_lookup(name, prefixes, partial, keys, options))
+        name, prefixes = normalize_name(name, prefixes)
+        details, details_key = detail_args_for(options)
+        @view_paths.find(name, prefixes, partial, details, details_key, keys)
       end
       alias :find_template :find
 
       def find_all(name, prefixes = [], partial = false, keys = [], options = {})
-        @view_paths.find_all(*args_for_lookup(name, prefixes, partial, keys, options))
+        name, prefixes = normalize_name(name, prefixes)
+        details, details_key = detail_args_for(options)
+        @view_paths.find_all(name, prefixes, partial, details, details_key, keys)
       end
 
       def exists?(name, prefixes = [], partial = false, keys = [], **options)
-        @view_paths.exists?(*args_for_lookup(name, prefixes, partial, keys, options))
+        name, prefixes = normalize_name(name, prefixes)
+        details, details_key = detail_args_for(options)
+        @view_paths.exists?(name, prefixes, partial, details, details_key, keys)
       end
       alias :template_exists? :exists?
 
       def any?(name, prefixes = [], partial = false)
-        @view_paths.exists?(*args_for_any(name, prefixes, partial))
+        name, prefixes = normalize_name(name, prefixes)
+        details, details_key = detail_args_for_any
+        @view_paths.exists?(name, prefixes, partial, details, details_key, [])
       end
       alias :any_templates? :any?
 
@@ -147,12 +155,6 @@ def build_view_paths(paths)
         ActionView::PathSet.new(Array(paths))
       end
 
-      def args_for_lookup(name, prefixes, partial, keys, details_options)
-        name, prefixes = normalize_name(name, prefixes)
-        details, details_key = detail_args_for(details_options)
-        [name, prefixes, partial || false, details, details_key, keys]
-      end
-
       # Compute details hash and key according to user options (e.g. passed from #render).
       def detail_args_for(options) # :doc:
         return @details, details_key if options.empty? # most common path.
@@ -167,12 +169,6 @@ def detail_args_for(options) # :doc:
         [user_details, details_key]
       end
 
-      def args_for_any(name, prefixes, partial)
-        name, prefixes = normalize_name(name, prefixes)
-        details, details_key = detail_args_for_any
-        [name, prefixes, partial || false, details, details_key]
-      end
-
       def detail_args_for_any
         @detail_args_for_any ||= begin
           details = {}

actionview/lib/action_view/path_set.rb

@@ -44,28 +44,31 @@ def #{method}(*args)
       METHOD
     end
 
-    def find(*args)
-      find_all(*args).first || raise(MissingTemplate.new(self, *args))
+    def find(path, prefixes, partial, details, details_key, locals)
+      find_all(path, prefixes, partial, details, details_key, locals).first ||
+        raise(MissingTemplate.new(self, path, prefixes, partial, details, details_key, locals))
     end
 
-    def find_all(path, prefixes = [], *args)
-      _find_all path, prefixes, args
+    def find_all(path, prefixes, partial, details, details_key, locals)
+      search_combinations(prefixes) do |resolver, prefix|
+        templates = resolver.find_all(path, prefix, partial, details, details_key, locals)
+        return templates unless templates.empty?
+      end
+      []
     end
 
-    def exists?(path, prefixes, *args)
-      find_all(path, prefixes, *args).any?
+    def exists?(path, prefixes, partial, details, details_key, locals)
+      find_all(path, prefixes, partial, details, details_key, locals).any?
     end
 
     private
-      def _find_all(path, prefixes, args)
-        prefixes = [prefixes] if String === prefixes
+      def search_combinations(prefixes)
+        prefixes = Array(prefixes)
         prefixes.each do |prefix|
           paths.each do |resolver|
-            templates = resolver.find_all(path, prefix, *args)
-            return templates unless templates.empty?
+            yield resolver, prefix
           end
         end
-        []
       end
 
       def typecast(paths)

actionview/test/template/lookup_context_test.rb

@@ -221,7 +221,7 @@ def setup
   test "if a single prefix is passed as a string and the lookup fails, MissingTemplate accepts it" do
     e = assert_raise ActionView::MissingTemplate do
       details = { handlers: [], formats: [], variants: [], locale: [] }
-      @lookup_context.view_paths.find("foo", "parent", true, details)
+      @lookup_context.view_paths.find("foo", "parent", true, details, nil, [])
     end
     assert_match %r{Missing partial parent/_foo with .*\n\nSearched in:\n  \* "/Path/to/views"\n}, e.message
   end