Django Design Patterns and Best Practices - Second Edition

Problem details

Fat models, thin views is an adage commonly told to Django beginners. Ideally, your views should not contain anything other than presentation logic.

However, over time, pieces of code that cannot be placed anywhere else tend to go into models. Soon, models become a dump yard for the code.

Consider refactoring out a Service object if your model contains code for any of the following:

1. Interactions with external services, for example, checking whether the user is eligible to get a SuperHeroProfile with a web service
2. Helper tasks that do not deal with the database, for example, generating a short URL or random captcha for a user
3. Making a short-lived object without a database state, for example, creating a JSON response for an ...