Ruby-on-rails – Create ERD type diagrams from Rails code

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I'm beginning to learn Ruby on Rails, and looking at other peoples code. Is there any way to take an exisiting codebase and create object relationship diagrams or Entity relationship diagrams (ERD's) ?

I know Visio can do some things given a database, but I was hoping to produce diagrams of classes and objects.

Best Solution

Also Rails ERD is not bad. It is a bit simpler than Railroad but it is still a great project.