Django graffle is a Django app that provides a management command called graffle. This command uses Omnigraffle in order to produce a graph of your models and their relationships.
Forget complicated tools, write your models and graph them for your boss.
First, install appscript.
Download source code and run python setup.py install. Then, Add django_graffle to your INSTALLED_APPS in your project.
In you project, run python manage.py graffle. If you want to graph only some apps, specify their names on command line. The command looks for an OS X App called "Omnigraffle Professional 5". You can change it with --omnigraffle option.
Django graffle is released under the BSD license. See the LICENSE file for the complete license.