Update an item in an array that is in an array

Question

I have a document in a mongodb collection like this :

{
    sessions : [
        {
            issues : [ 
                {
                    id : \"6e184         


        

Answer 1

You have to use this (apparently equivalent) query:

db.mycollection.update({"sessions.0.issues": {$elemMatch: {id: <yourValue>}}}, {$set: {"sessions.0.issues.$.text": "newText"}})

Notice that your update expression was correct.

More information about $elemMatch.

Btw, MongoDB reference explicits that $ operator does not work "with queries that traverse nested arrays".

Important: $elemMatch only works with version 4 or more.