1 files changed, 6 insertions, 1 deletions
diff --git a/railties/lib/rails/generators/rails/app/app_generator.rb b/railties/lib/rails/generators/rails/app/app_generator.rb
index 96c49a81bb..a90f109844 100644
--- a/railties/lib/rails/generators/rails/app/app_generator.rb
+++ b/railties/lib/rails/generators/rails/app/app_generator.rb
@@ -356,8 +356,13 @@ module Rails
         @app_name ||= File.basename(destination_root)
       end
 
+      def defined_app_const_base
+        Rails.respond_to?(:application) && defined?(Rails::Application) &&
+          Rails.application.is_a?(Rails::Application) && Rails.application.class.name.sub(/::Application$/, "")
+      end
+
       def app_const_base
-        @app_const_base ||= app_name.gsub(/\W/, '_').squeeze('_').camelize
+        @app_const_base ||= defined_app_const_base || app_name.gsub(/\W/, '_').squeeze('_').camelize
       end
 
       def app_const