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119

answers:

1

Looking for a good tool/gem that can automatically generate a nice looking UML diagram for an existing rails application.

(Im imagining such a tool would read the schema.rb file and then scan the models for relationships)

+1  A: 

RubyMine has a tool to do this; they call it a "model dependency diagram", but it generates a UML-like graph for your application models.

If you don't want to use RubyMine, check out RailRoad. It's a standalone tool that does similar, though RubyMine's is prettier, IMO.

Chris Heald
RailRoad has not been updated in the last two years so probably not the best option
Jordi Cabot
@Jordi Cabot exactly, I tried it approximately a year ago and it was not working
Gabriel Ščerbák