ActionController::Renderer allows you to render arbitrary templates without requirement of being in controller actions.

Developing a Ruby on Rails application on Windows can be difficult, but doesn't have to be with Docker. Learn how to use Docker to create isolated containers and get them to talk with the Rails app and passed through to the local computer.

Extend your image upload functionality with JCrop. Learn to redirect the user to a crop page once they have uploaded their image and save versions of the cropped images.

Using Continuous Integration, you can perform tasks and run your tests automatically whenever you commit your code. Travis CI offers free Continuous Integration for open source projects.

SimpleMDE is a great WYSIWYG Markdown Editor, but lacks the ability to handle image uploads. In this episode, we look at adding ActiveStorage and some JavaScript to handle image uploading.