Split string into an array of substrings or characters in MongoDB

Question

I need to convert fields like this:

{ 
    \"_id\" : ObjectId(\"576fd6e87d33ed2f37a6d526\"), 
    \"phoneme\" : \"JH OY1 N Z\" 
}

into an a

Answer 1

This should work with Mongo 3.4+ (see here for more info). This is a bit more concise than user3100115's answer.

db.members.aggregate(
    [
        { "$addFields": { 
            "phonemes": { "$split": [ "$phoneme", " " ] } 
        }},
        { "$out": "members" }
    ]
)