Repository pattern for data access in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Express module.

Express

const express = require('[1]');

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Afs

Bexpress

Chttp

Dpath

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'http' instead of 'express'.

Forgetting to put quotes around the module name.

The Express module is imported by requiring 'express'.

2fill in blank

medium

Complete the code to create a new Express Router instance.

Express

const router = express.[1]();

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Aapp

Bserver

Croute

DRouter

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'route' instead of 'Router'.

Using 'app' which is for the main app, not router.

Express Router is created by calling express.Router().

3fill in blank

hard

Fix the error in the repository method to return all users.

Express

async getAllUsers() {
  return await this.db.[1]('users');
}

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Afind

Binsert

Cdelete

DfindOne

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'findOne' which returns a single user.

Using 'insert' which adds data instead of retrieving.

The method to get all documents is 'find'.

4fill in blank

hard

Fill both blanks to define a repository method that finds a user by ID.

Express

async getUserById([1]) {
  return await this.db.findOne([2]: id);
}

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Aid

BuserId

C_id

Duser_id

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'userId' as parameter but not matching query key.

Using 'id' parameter but wrong query key like 'user_id'.

The method parameter is 'id' and the query key is '_id' to find by MongoDB ID.

5fill in blank

hard

Fill all three blanks to create a repository method that updates a user by ID.

Express

async updateUser([1], [2]) {
  return await this.db.updateOne([3]: id}, { $set: data });
}

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Aid

Bdata

C_id

DuserData

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing parameter names like 'userData' instead of 'data'.

Using wrong query key like 'user_id' instead of '_id'.

The method takes 'id' and 'data' as parameters, and uses '_id' as the query key to update the user.