NodeJS with Mongoose - pragmatically add url to image retrieved with find() - node.js

Question

I have the following Mongoose schema:
var userSchema = new Schema({
username: {
type: String,
},
password: {
type: String,
},
email: {
type: String,
},
_imageId: [{
type: mongoose.Schema.Types.ObjectId,
ref: 'files'
}]
});
When I retrieve data from the database using the function findOne() in this way
getById: function (req, res) {
User.findOne({ _id: req.params.id }, function (err, user) {
getProfileImage(req, user, function(user) {
return res.status(200).send({
msg: 'User retrieved successfully',
data: user
});
});
});
}
I get an array of image, but only with their id, so I have to manually add the URL using the function getProfileImage.
Is there a way using Mongoose to pragmatically add the URL?
EDIT:
I add the implementation of getProfileImage
var getProfileImage = function(req, user, callback) {
if(user && user._imageId.length > 0) {
user.set('profileImage', req.protocol + '://' + req.get('host') + '/image/get/' + user._imageId[user._imageId.length - 1], { strict: false });
}
callback(user);
};

Answer 1

Yes there is a way, and it doesn't involve storing _imageId in the userSchema. It's the other way around. You need to create a imageSchema that stores _userId and fetch all images from there.
Schemas
var userSchema = new Schema({
username: {
type: String,
},
password: {
type: String,
},
email: {
type: String,
}
});
var imageSchema = new Schema({
url: {
type: String,
},
userId: {
type: mongoose.Schema.Types.ObjectId,
}
});
Controller
getById: function (req, res) {
User.findOne({ _id: req.params.id }, function (err, user) {
// Get images related to the user
Image.find({userId: req.params.id}, function(err, images) {
user.images = images;
return res.status(200).send({
msg: 'User retrieved successfully',
data: user
});
});
});
}