Merge pull request #35533 from Shopify/zeitwerk-custom-inflectors

Allow autoloader inflectors to be swaped out

3 files changed, 13 insertions, 2 deletions

diff --git a/railties/lib/rails.rb b/railties/lib/rails.rb
index 1f533a8c04..663960bb77 100644
--- a/railties/lib/rails.rb
+++ b/railties/lib/rails.rb
@@ -6,6 +6,7 @@ require "pathname"
 
 require "active_support"
 require "active_support/dependencies/autoload"
+require "active_support/dependencies/zeitwerk_integration"
 require "active_support/core_ext/kernel/reporting"
 require "active_support/core_ext/module/delegation"
 require "active_support/core_ext/array/extract_options"
diff --git a/railties/lib/rails/autoloaders.rb b/railties/lib/rails/autoloaders.rb
index a6974cc207..36444ef05e 100644
--- a/railties/lib/rails/autoloaders.rb
+++ b/railties/lib/rails/autoloaders.rb
@@ -7,13 +7,19 @@ module Rails
 
       def main
         if zeitwerk_enabled?
-          @main ||= Zeitwerk::Loader.new.tap { |loader| loader.tag = "rails.main" }
+          @main ||= Zeitwerk::Loader.new.tap do |loader|
+            loader.tag = "rails.main"
+            loader.inflector = ActiveSupport::Dependencies::ZeitwerkIntegration::Inflector
+          end
         end
       end
 
       def once
         if zeitwerk_enabled?
-          @once ||= Zeitwerk::Loader.new.tap { |loader| loader.tag = "rails.once" }
+          @once ||= Zeitwerk::Loader.new.tap do |loader|
+            loader.tag = "rails.once"
+            loader.inflector = ActiveSupport::Dependencies::ZeitwerkIntegration::Inflector
+          end
         end
       end
 
diff --git a/railties/test/application/configuration_test.rb b/railties/test/application/configuration_test.rb
index 73773602a3..9ba5517afd 100644
--- a/railties/test/application/configuration_test.rb
+++ b/railties/test/application/configuration_test.rb
@@ -1167,6 +1167,8 @@ module ApplicationTests
       assert_instance_of Zeitwerk::Loader, Rails.autoloaders.once
       assert_equal "rails.once", Rails.autoloaders.once.tag
       assert_equal [Rails.autoloaders.main, Rails.autoloaders.once], Rails.autoloaders.to_a
+      assert_equal ActiveSupport::Dependencies::ZeitwerkIntegration::Inflector, Rails.autoloaders.main.inflector
+      assert_equal ActiveSupport::Dependencies::ZeitwerkIntegration::Inflector, Rails.autoloaders.once.inflector
 
       config.autoloader = :classic
       assert_not Rails.autoloaders.zeitwerk_enabled?
@@ -1181,6 +1183,8 @@ module ApplicationTests
       assert_instance_of Zeitwerk::Loader, Rails.autoloaders.once
       assert_equal "rails.once", Rails.autoloaders.once.tag
       assert_equal [Rails.autoloaders.main, Rails.autoloaders.once], Rails.autoloaders.to_a
+      assert_equal ActiveSupport::Dependencies::ZeitwerkIntegration::Inflector, Rails.autoloaders.main.inflector
+      assert_equal ActiveSupport::Dependencies::ZeitwerkIntegration::Inflector, Rails.autoloaders.once.inflector
 
       assert_raises(ArgumentError) { config.autoloader = :unknown }
     end