Let Zeitwerk be a dependency of Active Support

Zeitwerk is a strong dependency, planned to replace AS::Dependencies. A
line in the generated Gemfile does not convey this as much.

4 files changed, 7 insertions, 18 deletions

diff --git a/railties/lib/rails/application/configuration.rb b/railties/lib/rails/application/configuration.rb
index 16fbc99e7a..af3ec36064 100644
--- a/railties/lib/rails/application/configuration.rb
+++ b/railties/lib/rails/application/configuration.rb
@@ -271,7 +271,11 @@ module Rails
       end
 
       def autoloader=(autoloader)
-        if %i(classic zeitwerk).include?(autoloader)
+        case autoloader
+        when :classic
+          @autoloader = autoloader
+        when :zeitwerk
+          require "zeitwerk"
           @autoloader = autoloader
         else
           raise ArgumentError, "config.autoloader may be :classic or :zeitwerk, got #{autoloader.inspect} instead"
diff --git a/railties/lib/rails/generators/rails/app/templates/Gemfile.tt b/railties/lib/rails/generators/rails/app/templates/Gemfile.tt
index a1f1224a45..783254b54d 100644
--- a/railties/lib/rails/generators/rails/app/templates/Gemfile.tt
+++ b/railties/lib/rails/generators/rails/app/templates/Gemfile.tt
@@ -36,9 +36,7 @@ gem 'bootsnap', '>= 1.4.0', require: false
 # gem 'rack-cors'
 
 <%- end -%>
-<% if RUBY_ENGINE == "ruby" -%>
-gem "zeitwerk", ">= 1.0.0"
-
+<% if RUBY_ENGINE == 'ruby' -%>
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
diff --git a/railties/test/generators/app_generator_test.rb b/railties/test/generators/app_generator_test.rb
index 937b8eb427..1ee9e43e89 100644
--- a/railties/test/generators/app_generator_test.rb
+++ b/railties/test/generators/app_generator_test.rb
@@ -660,15 +660,6 @@ class AppGeneratorTest < Rails::Generators::TestCase
     assert_gem "jbuilder"
   end
 
-  def test_inclusion_of_zeitwerk
-    run_generator
-    if RUBY_ENGINE == "ruby"
-      assert_gem "zeitwerk"
-    else
-      assert_no_gem "zeitwerk"
-    end
-  end
-
   def test_inclusion_of_a_debugger
     run_generator
     if defined?(JRUBY_VERSION) || RUBY_ENGINE == "rbx"
diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index 47d42645c6..4442cdf4bf 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -491,11 +491,7 @@ Module.new do
   # Fake 'Bundler.require' -- we run using the repo's Gemfile, not an
   # app-specific one: we don't want to require every gem that lists.
   contents = File.read("#{app_template_path}/config/application.rb")
-  if RUBY_ENGINE == "ruby"
-    contents.sub!(/^Bundler\.require.*/, "%w(turbolinks webpacker zeitwerk).each { |r| require r }")
-  else
-    contents.sub!(/^Bundler\.require.*/, "%w(turbolinks webpacker).each { |r| require r }")
-  end
+  contents.sub!(/^Bundler\.require.*/, "%w(turbolinks webpacker).each { |r| require r }")
   File.write("#{app_template_path}/config/application.rb", contents)
 
   require "rails"