don't create db directory when skip active_record

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

@@ -241,6 +241,7 @@ def create_active_record_files
       end
 
       def create_db_files
+        return if options[:skip_active_record]
         build(:db)
       end
 

railties/test/generators/app_generator_test.rb

@@ -356,6 +356,7 @@ def test_generator_if_skip_puma_is_given
 
   def test_generator_if_skip_active_record_is_given
     run_generator [destination_root, "--skip-active-record"]
+    assert_no_directory "db/"
     assert_no_file "config/database.yml"
     assert_no_file "app/models/application_record.rb"
     assert_file "config/application.rb", /#\s+require\s+["']active_record\/railtie["']/