Hi there buddy! I've heard you've been looking for a simple and functional documentation generator for this Ruby web app of yours. Phari Doc Generator will provide you an easy way to generate documentation for your projects. The result will be a project page with a description that can be written using a simplified markdown syntax that is going to be explained ahead. Also, each ruby Class will have it's own page especifying it's relatios helper methods and controller routes including their inputs, outputs and descriptions. The gem includes an executable file and the classes that can be used individually, providing the possibility to use the generator for any project structure.
Full article: https://rubygems.org/gems/phari_doc_gen