Rails core - May 2014 - Optional database connection in the initializer

Hi!

I'm working on a project that uses rails and I would like to have an 
onboarding process where rails works even if there's no database 
connection. I detect if ActiveRecord::Base is connected and if not, I show 
an html page to the user that explains how to connect it to the database.

With how the initializers works, I believe it's not possible to include 
ActiveRecord and not have it connected to a database so I created a fork 
and wanted to discuss about it here.

Here's the patch in my fork as it is right now: 

https://github.com/pothibo/rails/commit/f359fd6288bc3a05f41266eeecbce04e21d8a5a2

Here's a few things that might be worth discussing:

- Is it something that can make it to master?
- configuration name: can I name it better?

Have a good day,

Pier-Olivier Thibault

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