Call MongoDB stored function from pymongo

Question

I have the following function stored in mongodb:

db.system.js.save({
    _id: "testFunc",
    value: function() {
        return db.clients.find_one({}, {"_id" : False});
    }
});

How do I call the function above from python using pymongo? I have already tried db.eval('testFunc') and it doesn't work. The method is deprecated.

If I read the doc correctly, it should be db.system_js.testFunc(). stackoverflow.com/questions/16774889/… — Tim Roberts
– Tim Roberts, Commented Jan 22, 2022 at 19:34
Unfortunately, I have tested that method too and it does not work. — Green Elephant
– Green Elephant, Commented Jan 22, 2022 at 19:39
Is this a real function? It's a simple findOne - there is no need for a stored function. — Wernfried Domscheit
– Wernfried Domscheit, Commented Jan 22, 2022 at 23:10
The purpose was to understand how to call a stored function in mongodb from python. The above function is just for testing. — Green Elephant
– Green Elephant, Commented Jan 23, 2022 at 11:46

Belly Buster · Accepted Answer · 2022-01-22 19:44:05Z

2

eval, system_js etc. are all deprecated.

While you can still create javascript functions on the server, it comes with a clear warning:

Do not store application logic in the database. There are performance limitations to running JavaScript inside of MongoDB. Application code also is typically most effective when it shares version control with the application itself.

answered Jan 22, 2022 at 19:44

Belly Buster

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