Mongoose auto increment

According to this mongodb article it is possible to auto increment a field and I would like the use the counters collection way.

The problem with that example is that I don't have thousands of people typing the data in the database using the mongo console. Instead I am trying to use mongoose.

So my schema looks something like this:

var entitySchema = mongoose.Schema({  testvalue:{type:String,default:function getNextSequence() {        console.log('what is this:',mongoose);//this is mongoose        var ret = db.counters.findAndModify({                 query: { _id:'entityId' },                 update: { $inc: { seq: 1 } },                 new: true               }        );        return ret.seq;      }    }});

I have created the counters collection in the same database and added a page with the _id of 'entityId'. From here I am not sure how to use mongoose to update that page and get the incrementing number.

There is no schema for counters and I would like it to stay that way because this is not really an entity used by the application. It should only be used in the schema(s) to auto increment fields.