Hi, everyone. Rein H. was asking in the #rubyonrails freenode IRC
channel about what we’d like to see in a beginner Ruby on Rails
tutorial. I told him I wanted a good visual diagram of the basic data
model relationships. This got me thinking, so I went ahead and cooked
one up last night. I’ve added it to the files section of the Google
Groups Beta page for this group. I also have it at the following
address:
http://mboffin.com/stuff/ruby-on-rails-data-relationships.png
I hope it helps new Rails developers get their head around defining
relationships. As a new Rails developer, I certainly would have loved
to have something like this. I’d love to get feedback on it, good and
bad. (Especially if there are errors.) 
–Dylan