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A comprehensive guide on building custom models fields in Django. Including descriptors, lookups, expressions and many more.

Often you need to map domain entities onto your application and store them in a database. Django provides you with a very extensible API that allows you to integrate domain entities with ORM seamlessly. This talk will walk through all essential steps in building a Money instances support for Django from the ground, based on real-life examples taken from django-money library.

Here is an overview of the talk structure:

Historical notes on django-money project.

Implementing a field for Money

• Connecting py-moneyed with Django. Map Money to Model
• What field to choose?
• Implicit currency field
• How descriptors could help here?

Querying MoneyField

• Designing the API
• Lookup API vs. old style model managers surgery
• Expressions. Enhancing Money class

Extras:

• Integrating Django admin. Utilizing AppConfig.ready
• Serialization
• Validators
• Migrations. Deconstruction & backends differences
• Testing

Slides: http://slides.com/stranger6667/building-a-custom-model-field-from-the-ground-up#/