This is a plugin to generate a GraphViz chart of your ActiveRecord models through a rake task.  

To install the plugin, just do:

script/plugin install git://github.com/johnnyb/activerecord_viz.git

To generate the chart, just do:

rake arviz:argraph:create

and it will generate the file db/argraph.dot which can then be viewed with Graphviz.
Graphviz will generate the graph visualization, and then can export it to a number of 
formats.  Graphviz is available at:

http://www.graphviz.org/

Copyright information is in the LICENSE file.