Introducing SocialNetwork (Composition)

Up until now, we’ve built our User and Post classes, and we’ve ensured that sensitive data is protected. But what happens when we scale up? Imagine managing a bustling social network where thousands of users post chirps daily. Without a central place to organize and manage all this data, your application would quickly become chaotic.

Until now, our User and Post classes have worked independently, handling their own data and behaviors. But in a real-world application, we need a home base to gather and manage these objects—a container that lets you easily search, update, and maintain everything in one place. This is where composition comes in.

Composition is an OOP concept where a class is built by combining objects of other classes. In composition, one class has objects of other classes as part of its internal structure. This forms a has-a relationship—if a SocialNetwork class has users and posts, then SocialNetwork is composed of these objects within a single organization.