autoload_with_const_missing

🔄 Leveraging autoload with const_missing

Combine Module#autoload with a custom const_missing hook to lazily load or generate constants on demand. This pattern helps keep your startup time low while ensuring only the necessary constants are loaded. You can also implement fallbacks if the file path doesn’t exist.

module MyApp
  # Automatically load `MyApp::ServiceX` from "my_app/service_x.rb"
  autoload :ServiceX, "my_app/service_x"

  def self.const_missing(name)
    warn "Constant \\#{name} not found, attempting dynamic generation..."
    # e.g., generate a null object or proxy
    const_set(name, Class.new do
      def method_missing(m, *args) ; nil ; end
    end)
  end
end

# Usage
MyApp::ServiceX.new.perform
MyApp::NonExistentConstant.some_method  # Triggers const_missing