I am using Model.aggregate() to return selected fields from a selected document in MongoDb using Mongoose.
Here are my models (they’re simple don’t worry):
const exerciseSchema = new mongoose.Schema({
id: String,
description: String,
duration: Number,
date: {type: Date,
default: new Date()}
})
const userSchema = new mongoose.Schema({
username: { type: String,
required: true,
unique: true},
exercise: [exerciseSchema]
})
What I’m trying to do is return the user with some fields from the associated exercise array. I would like the date to be returned in a format “YYYY-MM-DD”, but I can’t figure out how to include it in my query:
app.get(`/api/exercise/log/:userId`, async(req, res) => {
let user = await User.aggregate([
{ $match : {_id: mongoose.Types.ObjectId(req.params.userId) }},
{ $project: { username: 1,
exercise: { description: 1,
duration: 1,
date: 1
}
}
}
], (err, user) => {
if (err) { console.log(err.message);
return res.send(`User id: ${req.params.userId} not found!`)
};
user[0].count = user[0].exercise.length;
res.status(200).send(user[0]);
})
});
Is there a way I can format the date field somehow before it is returned? I know there is a way ! But I cannot find it.
Also , would not say I was clear on why user is returned as an array - I guess it is because I am not searching in a “find one” type style so the query sets up an array. If anyone has advice about that (since I wonder if this is a sub optimal approach?) pleaes help!
Also … can you do something like… chain together 2 $project operations so that you can have one inclusive and one exclusive? Maybe I should not worry about it and focus on end result here !