Strategies for organizing libraries within mongoDB's system.js

Exploring techniques for storing prototype-based libraries or frameworks in mongoDB's system.js can be challenging. An issue arose when attempting to incorporate dateJS formats in a map-reduce function. JIRA #SERVER-770 clarifies that object closures, including their prototypes, are lost during serialization to the system.js collection, which is considered normal behavior. This limitation impacts popular frameworks like dojo, Google Closure, and jQuery.

Is there a workaround to store libraries without relying on prototyping? One potential approach involves initializing before Map-Reduce and passing them through the scope object but results have been mixed. If this method proves ineffective, what alternatives exist to facilitate server-side javascript reusability within mongoDB?

javascriptmongodbmapreducegoogle-closure-library

Answer №1

When utilizing JavaScript for queries, it is possible to either reuse an existing JS context or create a new one where stored JS objects are loaded. To achieve your desired functionality, you have two options:

  1. Have mongod automatically run the stored code upon installation
  2. Use mapreduce with an init method

The first option is more intriguing. Interestingly, the mongodb v8 build does this automatically (though unofficially), while the official spidermonkey build does not.

For example, if you store code like this:

db.system.js.save({ _id: "mylib", value: "myprint = function() { print('installed'); return 'installed';" }

In the v8 build, you can freely use myprint() in your code, but in the spidermonkey build, you would need to explicitly call mylib().

To work around this, you can create another method:

db.system.js.save({ _id: "installLib", value: "if (!libLoaded) mylib(); libLoaded = true;" }

And then call it from your map() function.

I have created a ticket to standardize engines and enable automatic execution:

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