add to nested json in mongoDB

Question

For an instance I have a json document in mongodb

{
a:{b:c}
}

Now what am I suppost to do if I want to add to a nested json which will make it look like:

{
a:{b:c, d:e}
}

I have read the documentation of update. It has documented about $inc, $rename, $set & $unset. But I want it to add with existing elements of a. just like $addToSet do with an array.

beny23 · Accepted Answer · 2013-02-04 22:38:29Z

2

You can use the $set operator:

collection.update({'a.b': 'c' }, {$set: {'a.d': 'e'}} )

answered Feb 4, 2013 at 22:38

beny23

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3 Comments

sadaf2605 Over a year ago

for one or two elements its ok! But what will we do when the document will get bigger? :(

jmikola Over a year ago

@sadaf2605: You can add multiple criteria fields (e.g. if you also needed to match a value for a.f), and likewise for adding additional fields to $set. { $set: {'a.d': 'e', 'a.f': 'g'}} is perfectly legal syntax.

sadaf2605 Over a year ago

Thank you! :) I was thinking in a complicated way :(

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