Election process concept in MongoDB - Mini Project: Build & Apply

Election Process Concept in MongoDB

📖 Scenario: You are helping organize a small community election. You want to store information about candidates and votes in a MongoDB database.This project will guide you to create a collection for candidates, add a configuration for minimum votes to win, count votes for each candidate, and finally determine the winner.

🎯 Goal: Build a MongoDB setup that stores candidates, counts votes, and identifies the winner based on a minimum vote threshold.

📋 What You'll Learn

Create a candidates collection with candidate names and their initial votes.

Add a configuration variable min_votes_to_win to set the minimum votes needed to win.

Write a query to count votes for each candidate.

Write a query to find the candidate(s) who meet or exceed the minimum votes to win.

💡 Why This Matters

🌍 Real World

Community groups and organizations often use databases like MongoDB to manage election data efficiently.

💼 Career

Understanding how to store and query election data is useful for roles in data management, civic tech, and backend development.

1

Create the candidates collection with initial data

Create a MongoDB collection called candidates and insert these exact documents: { name: "Alice", votes: 10 }, { name: "Bob", votes: 15 }, and { name: "Charlie", votes: 7 }.

MongoDB

// Insert the candidates documents into the candidates collection
// Your code here

Need a hint?

Use insertMany to add multiple documents to the candidates collection.

2

Add a minimum votes to win configuration

Create a variable called min_votes_to_win and set it to 12 to represent the minimum votes a candidate needs to win.

MongoDB

db.candidates.insertMany([
  { name: "Alice", votes: 10 },
  { name: "Bob", votes: 15 },
  { name: "Charlie", votes: 7 }
])

// Create min_votes_to_win variable
// Your code here

Need a hint?

Use const to declare the variable min_votes_to_win with the value 12.

3

Query to count votes for each candidate

Write a MongoDB query using find() on the candidates collection to get all candidates with their names and votes.

MongoDB

db.candidates.insertMany([
  { name: "Alice", votes: 10 },
  { name: "Bob", votes: 15 },
  { name: "Charlie", votes: 7 }
])

const min_votes_to_win = 12

// Query all candidates with their votes
// Your code here

Need a hint?

Use find() with a projection to show only name and votes fields.

4

Find the winner(s) based on minimum votes

Write a MongoDB query using find() on the candidates collection to find candidate(s) where votes is greater than or equal to min_votes_to_win. Store the result in a variable called winners.

MongoDB

db.candidates.insertMany([
  { name: "Alice", votes: 10 },
  { name: "Bob", votes: 15 },
  { name: "Charlie", votes: 7 }
])

const min_votes_to_win = 12

const allCandidates = db.candidates.find({}, { name: 1, votes: 1, _id: 0 })

// Find candidates with votes >= min_votes_to_win
// Your code here

Need a hint?

Use the $gte operator in the query filter to find candidates with votes greater than or equal to min_votes_to_win.