Summary

In this chapter, we built the Postgres database locally and learned how to use the pgAdmin tool to manage it. Then, through the SQLAlchemy module, we developed an object library to manipulate the database. This is much easier than using SQL syntax directly. And, as long as we define the relationship between models, we can easily get the information we want. This results in higher code readability, fewer lines of code, and the elimination of repetitive SQL. We then use Flask-Migrate to build all the data tables. Then, when we migrate the database in the future, we simply need two commands – flask db migrate and flask db upgrade; it's simple and easy. Although Flask-Migrate can help us to set up and migrate a database more easily, in a production environment, performing this kind of migration still requires extra due diligence. We should always back up the database to safeguard our precious data.

During development, we should frequently test our code to make sure...