Callbacks are great for quickly tapping into the object life cycle. However, after a model or an application grows, it will become harder to maintain over time. It is better to extract the responsibility and separate the logic.

In this episode, we look into creating a blockchain as well as proof of work for car maintenance tracker application. Blockchain is used to establish a trust that records have not been tampered with.

Sometimes our models get so large that they become unmaintainable. In this episode, we look at how we can slim down the size of the models without losing functionality.

Create dynamic roles that can be assigned to users. Based on the assigned role, the user will be able to perform or view various parts of the application.

In this episode we create a Like/Unlike system where users can like posts and use Global ID to obfuscate IDs.