RailRoad is a class diagrams generator for Ruby on Rails applications.¹

Installation

$ sudo apt-get install graphviz
$ sudo gem install railroad

Generating Diagrams

Generating models diagram in .dot file format and converting it to png:

$ railroad -o models.dot -M
$ dot -Tpng models.dot > models.png

Models diagram in svg format.

$ railroad -M | dot -Tsvg > models.svg

Models diagram with all classes showing inheritance relations

$ railroad -a -i -o full_models.dot -M

Controllers diagram in png format.

$ railroad -C | neato -Tpng > controllers.png

Resources

¹ Railroad gem
Graphviz
Ruby on rails diagram generator – RailRoad