LinkedIn Clone With React Native | Like and unlike (Frontend+Backend)| Part 12.3.1|
Автор: I AM DEVELOPER
Загружено: 2025-12-19
Просмотров: 7
playlist link : • LinkedIn mobile clone using react native
In this video, I explain how to design a scalable Like / Unlike system in MongoDB using Mongoose.
We’ll see:
✅ Why storing likes inside the Post document is not scalable
✅ How to create a separate Like collection
✅ What a Compound Index is and why it is used
✅ How MongoDB internally uses a compound index (postId + userId)
✅ How to prevent duplicate likes using { unique: true }
✅ How to implement Like / Unlike toggle logic
✅ What $inc is and why it’s important
✅ How to safely store and update likesCount
✅ Common mistakes (wrong ID, wrong field type, schema mismatch)
This approach is used in real-world applications like Instagram, YouTube, and Linkedin, Twitter to handle millions of likes efficiently.
Perfect for:
✅ MERN stack developers
✅ Backend developers
✅ MongoDB & Mongoose learners
✅ Interview preparation
📌 Tech used:
✅ Node.js
✅ MongoDB
✅ Mongoose
✅ Express.js
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