Mongoose interprets the object in the Schema with key ‘type’ in your schema as type definition for that object.
deviceId: {
type : String,
index : {
unique : true,
dropDups : true
}
}
So for this schema mongoose interprets deviceId as a String instead of Object and does not care about all other keys inside deviceId.
SOLUTION:
Add this option object to schema declaration { typeKey: '$type' }
var deviceSchema = new Schema(
{
deviceId: {
type : String,
index : {
unique : true,
dropDups : true
}
},
alarms : [ {
timestamp : Number,
dateTime : String, //yyyymmddhhss
difference : Number,
actionTaken : String, //"send sms"
} ]
},
{ typeKey: '$type' }
);
By adding this we are asking mongoose to use $type
for interpreting the type of a key instead of the default keyword type
Mongoose Docs reference: https://mongoosejs.com/docs/guide.html#typeKey