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Using Mongoose with Node.js to Add Documents into a MongoDB Collection and For Loops to Display Document Fields
Posted on July 20, 2015 in MongoDB, Node.js by Matt Jennings

server.js Example

// require path
var path = require("path");

// require express and create express app
var express = require("express");
var app = express();

// Require body-parser since we need to handle
// poth data for adding a user
var bodyParser = require("body-parser");
app.use(bodyParser.urlencoded( {extended: true} ));

// Static content
app.use(express.static(path.join(__dirname + "/static")));

// Set up views folder and ejs
app.set("views", path.join(__dirname + "/views"));
app.set("view engine", "ejs");

// Require mongoose
var mongoose = require("mongoose");

// Connect to a MongoDB Database named
// "basic_mongoose" and if this Database doesn't exist
// create it!
mongoose.connect("mongodb://localhost/basic_mongoose");

// Create a new schema instance of the mongoose.Schema(...)
// object constructor which takes a
// JSON object as a parameter with schema types like
// "String" and "Number"
var UserSchema = new mongoose.Schema({
    name: String,
    age: Number
});

// Create a blueprint object and
// create the necessary database collection out of the model
var User = mongoose.model("User", UserSchema);

// Index route
app.get("/", function(req, res) {

    // Execute the "User" model to display documents
    // in the "user" collection
    User.find({}, function(err, users) {
        // If errors exist console log them on terminal server-side
        if(err) {
            console.log("Error:", err);
        }
        // Else render "index.ejs" and pass a "users" object with the
        // "users" MongoDB collection
        // of the "basic_mongoose" Database to "index.ejs"
        else {
            res.render("index", {users: users});
        }
    });

});

// Route to add a user
app.post("/users", function(req, res) {
    console.log("POST DATA", req.body);

    // Create a new User with the name and age corresponding
    // to those from req.body
    var user = new User( {name: req.body.name, age: req.body.age} );

    // Try to save that new user to the database and if needed
    // run a callback with an error from the operation
    user.save(function(err) {
        if(err) {
            console.log("Something went wrong");
        }
        else {
            console.log("Successfully added a user");
            res.redirect("/");
        }
    });

});

// Listen on port 8000
app.listen(8000, function() {
    console.log("Listening on port 8000");
});

For In Loop to Display Document Fields from a users MongoDB Collection on index.ejs

<% for(var user in users) { %>
    <ul>
        <li>Name: <%= users[user].name %><br />
            Age: <%= users[user].age %></li>
    </ul>
<% } %>

For Loop to Iterate Over Document Fields (from the LAST to FIRST element) from a users MongoDB Collection on index.ejs

<% for(var i = users.length - 1; i >= 0; i--) { %>
    <ul>
        <li>Name: <%= users[i].name; %><br />
        Age: <%= users[i].age %></li>
    </ul>
<% } %>

For Loop to Iterate Over Document Fields (from the FIRST to LAST element) from a users MongoDB Collection on index.ejs

<% for(var i = 0; i < users.length; i++) { %>
<ul>
    <li>Name: <%= users[i].name; %><br />
        Age: <%= users[i].age %></li>
</ul>
<% } %>

HTML form to insert Documents in a users Collection on index.ejs

<form action="users" method="post">
    <p>Name: <input type="text" name="name"/></p>
    <p>Age: <input type="number" name="age"/></p>
    <p><input type="submit" value="Submit"/></p>
</form>