Sequence Number for Id

I want to configure my Mongo DB to create sequence number for an Id column. Ex. It has to start from 1001 and increase by 1 automatically when I insert next row. I have my schema definitions as part of Node.JS how to add this configuration in Node schema?

MongoDB doesn't support this out of the box. The way I've implemented this (albeit in C#) is to create a "Sequence" collection with a key and a next number. You can atomically increment and return the next number then use this as the id in your collection.

This is a C# function, using the findandmodify mongodb command to fetch and update a sequence number for a given "key".

    public long GetNextSequenceNumber(string name, string key)
    {
        var update = new BsonDocument(new BsonElement("$inc", new BsonDocument(new BsonElement("SequenceNumber", 1))));
        var query = new BsonDocument("_id", key);

        var command = new CommandDocument { 
            { "findandmodify" , name },
            { "query", query},
            { "update" , update},
            { "new" , true},
        };

        var res = Db.RunCommand(command);

        if (res.Response["value"] != BsonNull.Value)
        {
            var o = BsonSerializer.Deserialize<Sequence>(res.Response["value"].ToBsonDocument());
            return o.SequenceNumber;
        }
        else
        {
            var o = new Sequence() { Id = key, SequenceNumber = 0 };
            Db.GetCollection(name).Insert<Sequence>(o);
            return o.SequenceNumber;
        }
    }

and the Sequence model:

    public class Sequence
    {            
        public string Id { get; set; }        
        public long SequenceNumber { get; set; }       
    }

The sequence documents look like:

{
    _id : 'mykey',
    SequenceNumber : NumberLong(1234)
}

If you need converting it to javascript please ask.

Hope that helps.