gistfile1.js

Location = {
    referencia: {
        type: Number,
        unique: true
    },
    owner: {
        type: Schema.Types.ObjectId,
        ref: 'Owner'
    },
    accounts: [
        {
            type: Schema.Types.ObjectId,
            ref: 'Account'
        }
    ], 
    ...
};

Account = {
    nome: {
        type: String
    },
    telemovel: {
        type: String
    },
    contacto2: {
        type: String
    },
    email: {
        type: String
    },
    nif: {
        type: Number
    }
};


//Accounts Controller
var list = function(req, res){
    Account.find().sort({nome: 1}).exec(function(err, accounts){
        //what is the best way to find out what locations each owner has?
        //right now, i am doing:
        var data = {};
        data.accounts = accounts;
        if(accounts.length === 0){
            res.render('accounts', data);
            return;
        }
        var completed = 0
        accounts.forEach(function (account) {
            Location.find({accounts: account._id}, function(err, locations){
                console.log('locations found');
                account.locations = locations;
                console.log(idx, account);
                if(++completed === accounts.length){
                    res.render('accounts', data);
                }
            });
        })
    });
};