Per-Field-Instance lookups

GSOC-2022.md

Per-Field-Instance lookups

Contributer: Allen Jonathan David Mentors: Mariusz Felisiak, Simon Charette Organization: Django Software Foundation

Goal

This project aims to add support to register and unregister custom lookups on a model’s Field instances. As of now, the Lookup API can only register and unregister lookups on Field classes. So a custom lookup added or overridden to a field affects all models which have that field, thus limiting the customizability of model lookups. Support for custom lookups for a particular field is the main goal of this project.

The detailed proposal for this project can be found here: GSoC-Proposal

The project

The project had already some work done by Simon Charette. I first worked on testing the existing implemetation. Later class_or_instance_method, register_instance_lookup, unregister_instance_lookup and get_instance_lookup were added. Then I fixed existing tests, worked on writing tests for the new feature (instance lookups) and added addition tests for already existing class lookups tests. Lastly I worked on the documentation explaining the new feature and version changed annotations.

The project pull request - Allowed registering lookups per field instances.

Main tasks

• Tested class_or_instance_method which return repective methods based on call type.
• Added support for register_instance_lookup, unregister_instance_lookup and get_instance_lookup.
• Added support for reverse relations.
• Fixed existing tests and wrote addition tests for the feature.
• Wrote the documentation explaining the new feature.

Additional tasks

Since the project was almost done earlier than expected, I worked on a few addition tickets.

• ticket_26511 Documented KeyTransform and KeyTextTransform
• ticket_33966 Add support for using KeyTextTransform from lookup

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