We recently added a bank account like functionality into one of our products. During the development we encountered some textbook problems and I thought it can be a good opportunity to go over some of the patterns we use in our Django models.
Tests can be a bummer to write but even a bigger nightmare to maintain. When we noticed we are putting off simple tasks just because we were afraid to update some monster test case, we started looking for more creative ways to simplify the process of writing and maintaining tests. In this article I will describe a class based approach to writing tests.
The Django admin is a very powerful tool. We use it for day to day operations, browsing data and support. As we grew some of our projects from zero to 100K+ users we started experiencing some of Django's admin pain points - long response times and heavy load on the database.