Mongoose .populate() only showing 1 document - json

Question

I am trying to output just the hometeam name's to the page so that I can try to understand how to work with my code better. It is only printing one team to the page, and it is printing all the details of that team to the page, whereas I only want it to print one part.
This is my code, I want it to print the name's of each hometeam to the page
app.get('/home', function(req, res) {
Match.findOne({}).populate('hometeam.name').exec(function(err, teams){
util.log(teams);
res.send(teams);
});
});
But when I load the page all I get is the first piece of data from this list of Matches
[
{
"hometeam": "5106e7ef9afe3a430e000007",
"_id": "5113b7ca71ec596125000005",
"__v": 0,
"key": 1360246730427
},
{
"hometeam": "5113c13e0eea687b28000001",
"_id": "5113e951354fe70330000001",
"__v": 0,
"key": 1360259409361
},
{
"hometeam": "5113c13e0eea687b28000001",
"_id": "5113e999354fe70330000002",
"__v": 0,
"key": 1360259481412
}
]
Also, if I try to put util.log(teams.hometeam.name) I get the following:
TypeError: Cannot call method 'toString' of undefined
But I would want it to be able to print the name which belongs to hometeam here. As hometeam is just the objectId of a Team in my database, am I missing something with the DBreferencing here?
Update:
Team Schema
var Team = new Schema({
'key' : {
unique : true,
type : Number,
default: getId
},
'name' : { type : String,
validate : [validatePresenceOf, 'Team name is required'],
index : { unique : true }
}
});
module.exports.Schema = Team;
module.exports.Model = mongoose.model('Team', Team);
Match Schema
var Team = require('../schemas/Team').Schema;
var Match = new Schema({
'key' : {
unique: true,
type: Number,
default: getId
},
'hometeam' : { type: Schema.ObjectId, ref: 'Team' },
'awayteam' : { type: Schema.ObjectId, ref: 'Team' }
});
module.exports = mongoose.model('Match', Match);

Answer 1

Populate takes the property name of the property you are trying to retrieve. This means that you should use 'hometeam' instead of 'hometeam.name'. However, you want to retrieve the name of the team so you could filter for that. The call would then become..
Match.findOne({}).populate('hometeam', {name: 1}).exec(function(err, teams)
Now you have a property called 'hometeam' with in that the name. Have fun :)
EDIT
Showing how to have a single mongoose instance in more files to have correct registration of schemas.
app.js
var mongoose = require('mongoose');
var Team = require('./schemas/team-schema')(mongoose);
var Match = require('./schemas/match-schema')(mongoose);
// You can only require them like this ONCE, afterwards FETCH them.
var Team = mongoose.model('Team'); // LIKE THIS
schemas/match-schema.js
module.exports = function(mongoose) {
var Match = new mongoose.Schema({
'key' : {
unique: true,
type: Number,
default: getId
},
'hometeam' : { type: mongoose.Schema.ObjectId, ref: 'Team' },
'awayteam' : { type: mongoose.Schema.ObjectId, ref: 'Team' }
});
return mongoose.model('Match', Match);
};
schemas/team-schema.js
module.exports = function(mongoose) {
var Team = new mongoose.Schema({
'key' : {
unique : true,
type : Number,
default: getId
},
'name' : { type : String,
validate : [validatePresenceOf, 'Team name is required'],
index : { unique : true }
}
});
return mongoose.model('Team', Team);
};