Ruby on Rails

I'm working on a Rails 1 application. We'd like to upgrade it to Rails 3
or 4, but Rails 1 is so old that we think it would take a total rewrite
to upgrade. There are management and budget issues with a total rewrite.
We wouldn't be able to deliver anything until the entire rewritten
application was finished.

So, we are searching for creative solutions to the upgrade problem. One
idea is to start rewriting the application in Rails 4 and run it
alongside the Rails 1 application. As features are added to the Rails 4
version, the same feature in the Rails 1 version could be taken offline.
Users would see a mix of the two versions. Some pages would be served by
Rails 1 and others by Rails 4.

This would require both the Rails 1 and Rails 4 versions to use the same
database.

So my question is, will this work? What problems with this approach
should we be anticipating? We know it isn't a perfect solution, but
we're hoping it's good enough to drive the project forward.

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