app_generator

# File railties/lib/rails/commands/app/update_command.rb, line 55
          def app_generator
            @app_generator ||= begin
              gen = Rails::Generators::AppGenerator.new(["rails"], generator_options, destination_root: Rails.root)
              gen.send(:valid_const?) unless File.exist?(Rails.root.join("config", "application.rb"))
              gen
            end
          end