Get values from one collection that are used in other (MongoDB) - angularjs

Question

I'm trying to create a small prediction game for football world cup with MEAN stack, but I have a problem that I need to get all the predicted games of user and all that are not predicted yet separately.
My schemas are (users schema is the default mean-stack):
/**
* Prediction Schema
*/
var PredictionSchema = new Schema({
game_id: {
type: Schema.ObjectId,
ref: 'Game'
},
user: {
type: Schema.ObjectId,
ref: 'User'
},
date: {
type: Date,
default: Date.now
},
choice: {
type: Number
}
});
And game schema:
var GameSchema = new Schema({
team1_key: {
type: String
},
team1_title: {
type: String
},
team2_key: {
type: String
},
team2_title: {
type: String
},
play_at: {
type: Date
},
score1: {
type: Number
},
score2: {
type: Number
}
});
mongoose.model('Game', GameSchema);
Anyway, what I'm trying to achieve is to get all games that are mentioned in all predictions and with the active user.
I tried like this, but it does not work:
/**
* List of Games predicted
*/
exports.allPredicted = function(req, res) {
Game.find({_id: {$in: Prediction.distinct('game_id')}}).sort('-created').populate('user', 'name username').exec(function(err, games) {
if (err) {
res.render('error', {
status: 500
});
} else {
res.jsonp(games);
}
});
};
What's wrong? I got error:
Error: Failed to lookup view "error" in views directory "/Users/username/Projects/ProjectName/server/views"
Any ideas? Thanks! :)
EDIT:
Got distinct values, not sure if this the create way of doing it, but anyway works.. almost:
exports.allPredicted = function(req, res) {
Prediction.distinct('game_id').populate('user', 'name username').exec(function(err, predictions) {
if (err) {
res.render('error', {
status: 500
});
} else {
console.log(predictions);
Game.find({_id: {$in: predictions }}).sort('-created').populate('user', 'name username').exec(function(err, games) {
if (err) {
res.render('error', {
status: 500
});
} else {
res.jsonp(games);
}
});
}
});
};
Now I need, that it should consider the active user as well. Any help?

Answer 1

you can find your active user in
req.user
so try
Prediction.find({user : req.user._id}).sort('-created').populate('game_id').exec(function(err, predictions) {
if (err) {
res.render('error', {
status: 500
});
} else {
res.jsonp(predictions);
}
});
This should return all the predictions made by your user and replace the game_id by the game associated.
ps: I don't test it but i think this is the logic of request you're looking for.
ps2 : see http://mongoosejs.com/docs/populate.html if you want to populate your users data too