Search users with fullname in MongoDB using Mongoosejs and Aggregation Framework in Node.js

models-user.js

var mongoose = require('mongoose');
var validate = require('mongoose-validator');
var Schema = mongoose.Schema;
var crypto = require('crypto');
var utilities = require('../services/utilities');

var userSchema = new Schema({
    firstname: { type : String, trim : true },
    lastname: { type : String, trim : true },
    username: { type: String, required: true, unique: true, lowercase: true, trim : true, index : true },
    password: { type: String, validate: passwordValidator },
    email: { type : String, trim : true, validate: emailValidator },
    phone: { type : String, trim : true },
    address: { type : String, trim : true },
    groups: [{ type : Schema.Types.ObjectId, ref : 'Group' }],
    created_at: Date,
    updated_at: Date
},
{
    toObject: { virtuals: true },
    toJSON: { virtuals: true }
});

userSchema.virtual('fullname').get(function () {
    return [this.firstname, this.lastname].filter(Boolean).join(' ');
});

userSchema.pre('save', function (next) {
    if (this.password) {
        this.password = encrypt(this.password);
    }
    utilities.reviewDate(this);
    next();
});

function encrypt(text) {
    return crypto.createHash("SHA512").update(text).digest("base64");
}

var emailValidator = [
    validate({
        validator: 'isEmail',
        message: 'Please fill a valid email address'
    })
];

var passwordValidator = [
    validate({
        validator: 'isLength',
        arguments: [6, 50],
        message: 'Password should be between {ARGS[0]} and {ARGS[1]} characters'
    }),
    validate({
        validator: 'matches',
        arguments: /\d/,
        message: 'Password should contain numbers'
    }),
    validate({
        validator: 'matches',
        arguments: /[a-zA-Z]/,
        message: 'Password should contain letters'
    }),
    validate({
        validator: 'matches',
        arguments: /[A-Z]/,
        message: 'Password must contain one uppercase letter'
    }),
    validate({
        validator: 'matches',
        arguments: /[\!\@\#\$\%\^\&\*\(\)\_\+\.\,\;\:]/,
        message: 'Password should contain a special characters like !@#$%^&*()_+'
    })
];

module.exports = mongoose.model('User', userSchema);

routes-users.js

var router = express.Router();
var User = require('../models/user');
var authorization = require('../services/authorization'); //Middleware to validate Auth Tokens :)

router.post('/find', authorization.ensureAuthenticated, function (req, res) {
    
    var userName = req.body.search; //userName = 'Juan David Nicholls';
    var searchString = new RegExp(userName, 'ig');
        
    User.aggregate()
    .project({
        fullname: { $concat: ['$firstname', ' ', '$lastname'] },
        firstname: 1,
        lastname: 1,
        username: 1,
        email: 1,
        phone: 1,
        address: 1
    })
    .match({ fullname: searchString })
    .exec(function (err, users) {
        if (err) throw err;
        
        res.json({
            users: users
        });
    });

});

services-utilities.js

var reviewDate = function (instance) {
    // get the current date
    var currentDate = new Date();
    // change the updated_at field to current date
    instance.updated_at = currentDate;
    // if created_at doesn't exist, add to that field
    if (!instance.created_at) {
        instance.created_at = currentDate;
    }
};

module.exports = {
    reviewDate: reviewDate
};