[PhillyOnRails] Initialize ActiveRecord w/o a database.

[Cassius Rosenthal <cassius@xmodulation.com>]

Here's my scenario: I have an app that interacts with a database in 
certain ways, but I don't know *which* database it will work with.  So 
the app begins with a user login which corresponds to a 
database/username/password hash.

Rails normally has this info in 'config/database.yml.'  I can't have 
this, since I don't know what the connection hash is until after the 
user logs in.  I tried leaving 'database.yml' blank and I tried 
disabling ActiveRecord's initialization.  Both cause runtime errors in 
the app, as it tries to cache relationships I guess.

I also tried running Ruby as a fcgi, and thought of running the app as a 
non-Rails program.  I looked at the Rails fcgi handler as an example.  
The fcgi handler is so extensive, I gave up on that route for now.  
[Aside: If someone wants to give a talk on how to use Ruby/fcgi without 
Rails, I think that would be cool.]

The question: Does anybody have an idea of how to initialize 
ActiveRecord on-the-fly, without using the config/database.yml' convention?

Thanks!
-Cassius
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