MongoDB - index an internal list of objects

Question

Assume the following data structure in MongoDB:

{
    \"_id\" : \"Bob Blocker\",
    \"ratings\" : {
        \"771206753\" : 1
    },
    \"prevalence\" : 1
}


        

Answer 1

You can't index dynamic keys and indexing ratings would index the whole object as a blob so you don't want to do that either.

It may work better to rework your schema to:

{
    "_id" : "Bob Blocker",
    "ratings" : [
        {id: "771206753", value: 1}
    ],
    "prevalence" : 1
}

and then index 'ratings.id'.