Minor Improvements Before Introducing the Cloud Firestore

In this lesson, we'll continue to put our newly gained knowledge of "Dynamic Getters" to work for us by using the thread getter to fix the reply count on the Forum page.

We'll also extract the authUser getter to a more general use "user" getter in 2 simple steps and use the user dynamic getter to display the proper thread count and posts count under the user on the post cards. This simple refactor demonstrates the power and flexibility of well thought out and well executed code.