MongoDB allows for the use of JavaScript to do lots of work on the server side. This includes running MapReduce jobs on collections, but also can be used in where clauses and for doing grouping. Being able to use JavaScript for these things is handy, but using just the core JavaScript language can be less than ideal. That's why we prime our MongoDB environment with Underscore.js.
On the Underscore website, it claims to be a JavaScript utility belt. I've found that to be the case. It has functions like any or include that save you the trouble of having to write for loops to iterate over arrays. While the MongoDB documentation describes how you can store individual functions for server side use, it didn't really touch on how you could load an entire library like Underscore.
It turns out you can load up libraries like this pretty easily using db.eval(). I recall reading (but can't currently find the docs to prove this) that every MongoDB connection has a JavaScript context associated with it. If you create functions in this context, they will exist as long as the connection is around. So if you just eval the Underscore.js library before you do any work with your connection, you will have access to all of its functions to do your work.
Here is an example of how to use Underscore.js with the Ruby driver. In this example, I'll set up the MongoDB connection with Underscore.js, create a sample dataset of cars, then use Underscore to group them by make without repeating model.
The only downside to this approach is that db.eval does not seem to work with sharding. That is OK for me right now, but YMMV. Also note that I am using the awesome_print gem to pretty print the results.
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