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Generate ERD diagrams for rails3 or highrer versions

Generate ERD diagrams for rails3 or highrer versions?

1)install sudo aptitude install graphviz
2)Add gem "rails-erd" to your application's Gemfile
3)bundle install
4)bundle exec erd

Another Method
1)gem install railroad
2)railroad -C | neato -Tpng > controllers.png
Controller diagram in PNG format
3)railroad -M | neato -Tpng > models.png
Model diagram in PNG format
railroad -M | dot -Tsvg > models.svg
Model diagram in SVG format
4)railroad -h

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