How to count records with one distinct field in mongoose?

Question

While exploring mongoose for nodejs I ran into the problem of needing to know the amount of user in my collection:

My collection has records, each record has a user

Answer 1

You can do a distinct query.

var Record = db.model('Record', yourSchema);
Record.find().distinct('user').exec(callback);

Mongoose Queries: http://mongoosejs.com/docs/queries.html

MongoDB distinct query: http://www.mongodb.org/display/DOCS/Aggregation#Aggregation-Distinct