Summary

In this chapter, we built a fully functional question and answer application for Google App Engine.

We learned how to use the Google App Engine SDK for Go to build and test our application locally before deploying it to the cloud, ready for our friends and family to use. The application is ready to scale if it suddenly starts getting a lot of traffic, and we can rely on the healthy quota to satisfy early traffic.

We explored how to model data in Go code, keep track of keys, and persist and query data in Google Cloud Datastore. We also explored strategies to denormalize such data in order to make it quicker to read back at scale. We saw how transactions can guarantee data integrity by ensuring that only one operation occurs at a particular point in time, allowing us to build reliable counters for the score of our answers. We used predictable data store keys to ensure that our users can only have one vote per answer, and we used incomplete keys when we wanted the data store to generate...