Merge pull request #29645 from y-yagi/check_component_when_run_app_update

Do not generate unused components contents in `app:update` task

railties/CHANGELOG.md

@@ -1,3 +1,10 @@
+*   Skip unused components when running `bin/rails app:update`.
+
+    If the initial app generation skipped Action Cable, Active Record etc.,
+    the update task honors those skips too.
+
+    *Yuji Yaginuma*
+
 *   Make Rails' test runner work better with minitest plugins.
 
     By demoting the Rails test runner to just another minitest plugin —

railties/lib/rails/app_updater.rb

@@ -0,0 +1,31 @@
+require "rails/generators"
+require "rails/generators/rails/app/app_generator"
+
+module Rails
+  class AppUpdater # :nodoc:
+    class << self
+      def invoke_from_app_generator(method)
+        app_generator.send(method)
+      end
+
+      def app_generator
+        @app_generator ||= begin
+          gen = Rails::Generators::AppGenerator.new ["rails"], generator_options, destination_root: Rails.root
+          File.exist?(Rails.root.join("config", "application.rb")) ? gen.send(:app_const) : gen.send(:valid_const?)
+          gen
+        end
+      end
+
+      private
+        def generator_options
+          options = { api: !!Rails.application.config.api_only, update: true }
+          options[:skip_active_record] = !defined?(ActiveRecord::Railtie)
+          options[:skip_action_mailer] = !defined?(ActionMailer::Railtie)
+          options[:skip_action_cable]  = !defined?(ActionCable::Engine)
+          options[:skip_sprockets]     = !defined?(Sprockets::Railtie)
+          options[:skip_puma]          = !defined?(Puma)
+          options
+        end
+    end
+  end
+end

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -128,7 +128,7 @@ module Rails
         gsub_file "config/initializers/cookies_serializer.rb", /json(?!,)/, "marshal"
       end
 
-      unless action_cable_config_exist
+      if !options[:skip_action_cable] && !action_cable_config_exist
         template "config/cable.yml"
       end
 

railties/lib/rails/tasks/framework.rake

@@ -36,38 +36,21 @@ namespace :app do
   end
 
   namespace :update do
-    class RailsUpdate
-      def self.invoke_from_app_generator(method)
-        app_generator.send(method)
-      end
-
-      def self.app_generator
-        @app_generator ||= begin
-          require_relative "../generators"
-          require_relative "../generators/rails/app/app_generator"
-          gen = Rails::Generators::AppGenerator.new ["rails"],
-                                                    { api: !!Rails.application.config.api_only, update: true },
-                                                    destination_root: Rails.root
-          File.exist?(Rails.root.join("config", "application.rb")) ?
-            gen.send(:app_const) : gen.send(:valid_const?)
-          gen
-        end
-      end
-    end
+    require_relative "../app_updater"
 
     # desc "Update config/boot.rb from your current rails install"
     task :configs do
-      RailsUpdate.invoke_from_app_generator :create_boot_file
-      RailsUpdate.invoke_from_app_generator :update_config_files
+      Rails::AppUpdater.invoke_from_app_generator :create_boot_file
+      Rails::AppUpdater.invoke_from_app_generator :update_config_files
     end
 
     # desc "Adds new executables to the application bin/ directory"
     task :bin do
-      RailsUpdate.invoke_from_app_generator :update_bin_files
+      Rails::AppUpdater.invoke_from_app_generator :update_bin_files
     end
 
     task :upgrade_guide_info do
-      RailsUpdate.invoke_from_app_generator :display_upgrade_guide_info
+      Rails::AppUpdater.invoke_from_app_generator :display_upgrade_guide_info
     end
   end
 end

railties/test/generators/app_generator_test.rb

@@ -278,6 +278,22 @@ class AppGeneratorTest < Rails::Generators::TestCase
     end
   end
 
+  def test_app_update_does_not_generate_action_cable_contents_when_skip_action_cable_is_given
+    app_root = File.join(destination_root, "myapp")
+    run_generator [app_root, "--skip-action-cable"]
+
+    FileUtils.cd(app_root) do
+      # For avoid conflict file
+      FileUtils.rm("#{app_root}/config/secrets.yml")
+      quietly { system("bin/rails app:update") }
+    end
+
+    assert_no_file "#{app_root}/config/cable.yml"
+    assert_file "#{app_root}/config/environments/production.rb" do |content|
+      assert_no_match(/config\.action_cable/, content)
+    end
+  end
+
   def test_application_names_are_not_singularized
     run_generator [File.join(destination_root, "hats")]
     assert_file "hats/config/environment.rb", /Rails\.application\.initialize!/