How to check if attribute exists in mongodb document in forEach function?

Question

I use MongoDB 2.6.2. I need to check in forEach if field name exists on selected document.

db.testData.find(...).forEach(function(x){
// insert code here
})

How to check inside forEach function if x contains field name or not ?

Answer 1

Mongo shell is a JavaScript shell, so most of the standard JavaScript methods are supported. You can check if the property exists as you would do on any regular object in JavaScript - by using hasOwnProperty() method:

db.testData.find({}).forEach(function(x){
    if (x.hasOwnProperty('name')) {
        // Do something
    }
})