Node devs tend to take a different approach to Rails/Django in this regard, there's no single ORM with lots of database backends (ala ActiveRecord). This is probably related to the fact that Node devs tend to use tools like Redis, Mongo and Couch rather than traditional relational databases like MySQL and Postgres which all have similar SQL interfaces. There are some really nice libraries and modeling tools available but they're not database agnostic SQL ORMs, for example recently I've been using Mongoose: http://mongoosejs.com/
I've come from the Django world so I empathise with the "How do I do [insert Django/Rails feature here]?" mindset, but a lot of the time the Django/Rails just doesn't work well Node. Node.js is a single-threaded, event-based, non-blocking server; it really is a totally different paradigm so you have to be prepared to rethink the modus operandi for developing web applications.
Of course, I did think about Redis/Mongo/etc. But the project (a) had deadlines, so I thought I'd go experimental on only half the software stack, (b) seemed very nicely suited to relational data modelling, and (c) allowed me to indulge my infinite love and respect for Postgres (stable! solid! powerful! frugal! fast! free!).
Also, I didn't find a lot of help online with how to do this modus operandi rethink. (Again, no whining implied).
Node devs tend to take a different approach to Rails/Django in this regard, there's no single ORM with lots of database backends (ala ActiveRecord). This is probably related to the fact that Node devs tend to use tools like Redis, Mongo and Couch rather than traditional relational databases like MySQL and Postgres which all have similar SQL interfaces. There are some really nice libraries and modeling tools available but they're not database agnostic SQL ORMs, for example recently I've been using Mongoose: http://mongoosejs.com/
I've come from the Django world so I empathise with the "How do I do [insert Django/Rails feature here]?" mindset, but a lot of the time the Django/Rails just doesn't work well Node. Node.js is a single-threaded, event-based, non-blocking server; it really is a totally different paradigm so you have to be prepared to rethink the modus operandi for developing web applications.