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Accepting Data From a Form And Saving It To MongoDB through Mongoose

McCauley™
Software Developer. An Algorithm Lover. And a Memer
・4 min read

⚫ SETTING UP YOUR NODEJS PROJECT


Or you can download the Project Setup from my GitHub repo

🌓 TERMINOLOGIES USED

  1. Model: A Mongoose model provides an interface to the database for creating, querying, updating, deleting records, etc. -FCC
  2. Schema: A Mongoose schema defines the structure of the document, default values, validators, etc. -FCC
  3. Mongoose: Mongoose is an object data modeling (ODM) library that provides a rigorous modeling environment for your data, enforcing structure as needed while still maintaining the flexibility that makes MongoDB powerful -DevCenter

🌕 STEP 1 of 3

  • Open your terminal and make sure it's navigated to the Project Folder
  • Enter the command below in the terminal to install the Mongoose and EJS modules
>> npm i mongoose ejs
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  • In your index.js file, require the mongoose module, and also create a variable that'll hold the database connection url
const mongoose = require("mongoose")
var connectionUrl = "mongodb://localhost:27017/databasename"
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  • Still in the index.js file, Establish a connection using the connection url
mongoose.connect(connectionUrl, {useNewUrlParser: true, useUnifiedTopology: true}, (err)=>{
    if(err) throw err
    console.log("Connected")
})
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🎯Summary of index.js file:

const express = require('express')
const app = express()
const mongoose = require("mongoose")
var connectionUrl = "mongodb://localhost:27017/databasename"
mongoose.connect(connectionUrl, {useNewUrlParser: true, useUnifiedTopology: true}, (err)=>{
    if(err) throw err
    console.log("Connected")
})

app.get("/home", (req, res)=>{
    res.send("Hello")
})

const port = process.env.PORT || 4000
app.listen(port, ()=>{
    console.log(`Listening to Port ${port}`)
})
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🌕 STEP 2 of 3

  • Create a new folder models Alt Text
  • In the models folder, create a user.js file
  • The following steps will be done in the user.js file:
📌 Require the mongoose module
const mongoose = require("mongoose")
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📌 Create a Schema variable and assign it the Schema class from mongoose
const Schema = mongoose.Schema
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📌 Instantiate the Schema class and pass in your document structure as an argument to the schema class
const UserSchema = new Schema({
    firstname: {
        type: String,
        required: [true, "Firstname is required"]
    }, 
    lastname: {
        type: String,
        required: [true, "Lastname is required"]
    }
})
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📌 Create a mongoose model with the preffered name of your collection and the UserSchema created above
const UserModel = mongoose.model("user", UserSchema)
// The String "user" above is the name of your collection
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📌 Export the model
module.exports = UserModel
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🎯Summary of user.js file:

const mongoose = require('mongoose');
const Schema = mongoose.Schema

const UserSchema = new Schema({
    firstname: {
        type: String,
        required: [true, "Firstname is required"]
    }, 
    lastname: {
        type: String,
        required: [true, "Lastname is required"]
    }
})

const UserModel = mongoose.model("user", UserSchema)
module.exports = UserModel
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🌕 STEP 3 of 3

  • Create a new folder views Alt Text
  • In the views folder, create an index.ejs file Alt Text
  • Create a simple html form in the index.ejs file with the method attribute set to POST and the action attribute set to /api/user
<html>
    <body>
        <form method="POST" action="/api/user">
            <label for="">Firstname</label>
            <input type="text" name="firstname" id=""><br>
            <label for="">Lastname</label>
            <input type="text" name="lastname" id=""><br>
            <input type="submit">
        </form>
    </body>
</html>
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  • The following steps will be done in the index.js file:
📌 Create a body parsing middleware with the built in express body-parser in order to populate the req.body with our inputs
app.use(express.urlencoded({extended: true}))
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📌 Set the view engine to ejs
app.set("view engine", "ejs")
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📌 Create a route for displaying the html form we created
app.get("/index", (req, res)=>{
    res.render("index")
})
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📌 Import the userModel from the models folderImport the userModel from the models folder
const UserModel = require("./models/user")
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📌 Create a route/endpoint for collecting and sending the user inputs to our Mongo DataBase
app.post("/api/user", (req, res)=>{

})
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📌 In the endpoint, Instantiate the UserModel and pass the req.body as an argument.
    const SaveUser = new UserModel(req.body)
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Note: The req.body holds the user inputs sent from the form.
📌 Save the UserInput to your database by adding the following lines of code to the endpoint:
        SaveUser.save((error, savedUser)=>{
        if(error) throw error
        res.json(savedUser)
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NOTE: The conditions in the save method is simply saying: If an error is encountered, throw the error. But if there is no error, return the saved user details.

🎯Updated Summary of index.js file:

const express = require('express')
const app = express()
const mongoose = require("mongoose")
const UserModel = require("./models/user")
var connectionUrl = "mongodb://localhost:27017/dbname"
mongoose.connect(connectionUrl, {useNewUrlParser: true, useUnifiedTopology: true}, (err)=>{
    if(err) throw err
    console.log("Connected")
})

app.use(express.urlencoded({extended: true}))
app.set("view engine", "ejs")

app.get("/home", (req, res)=>{
    res.render("index")
})

app.post("/api/user", (req, res)=>{
    const SaveUser = new UserModel(req.body)
    SaveUser.save((error, savedUser)=>{
        if(error) throw error
        res.json(savedUser)
    })
})

app.listen(9000, ()=>{
    console.log("listening to port 9000")
})
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>>> If your data was successfully saved, an object will be returned to you after submitting the form.


🏁 Having any Question or Suggestion? Drop them in the discussion section below. 👇

Discussion (2)

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dreamchild7 profile image
dreamchild7

Please review this your code especially in the index.js. It didn't work.

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zelal profile image
Zelal Hossain • Edited

Thank you for sharing