How to look for more than one element in an embedded array in MongoDb - sql

Question

I have a mongodb query: (Give me settings where account='test')
db.collection_name.find({"account" : "test1"}, {settings : 1}).pretty();
where I get the following output:
{
"_id" : ObjectId("49830ede4bz08bc0b495f123"),
"settings" : {
"clusterData" : {
"us-south-1" : "cluster1",
"us-east-1" : "cluster2"
},
},
What I'm looking for now, is to give me the account where the clusterData has more than 1 element in its array.
I'm only interested in listing those accounts with (2) or more elements.
I've tried this:
db.collection_name.find({'settings.clusterData.1': {$exists: true}}, {account : 1}).pretty();
Its not returning any results. Is my query correct? Is there another way to do this?

Answer 1

The reason that it isn't working is that your clusterdata is an object, not an array. I would suggest changing your data to be an array of clusters with two properties like below, then it will work.
{
"_id" : ObjectId("49830ede4bz08bc0b495f123"),
"settings" : {
"clusterData" : [
{
name : "cluster1",
location : "us-south-1"
},
{
name : "cluster2",
location : "us-east-1"
}
]
}
}