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= Google's Summer of Code 2023 =

Django is a mentor organization for the 2023 Google Summer of Code. Read
​[https://summerofcode.withgoogle.com Google's page] for more information on
how the program works.

Django's GSoC program is being coordinated by the current Django Fellows,
Carlton Gibson and Mariusz Felisiak.

== Mentors ==

If you're interested in mentoring -- supervising a student in work on Django-related activities -- let us know via the Mentoring topic on https://forum.djangoproject.com/.

== Students ==

Student application period runs until April 4, 2023.

If you'd like to get started on your proposal early, we'll be looking for a few things.

  * You'll need to have a concrete task in mind (some ideas are below) along with
    a solid idea of what will constitute "success" (you tell us).
  * If your proposal is a single large feature, library or site, you'll need to present
    a detailed design specification. This proposal should be posted to
    [https://forum.djangoproject.com/c/internals/mentorship/10 the Django Forum],
    where it can be refined until it is accepted by the developer community.
  * We'll want to know a bit about you -- links to previous work are great, if any. If you're proposing something ambitious, you'll need to convince us that you're up to the task.
  * You'll also need to provide us with a schedule, including a detailed work breakdown and major milestones so your mentor can know if and when to nag you :)

Here's an example of an accepted proposal from a previous year:

* https://gist.github.com/chrismedrela/82cbda8d2a78a280a129

Note that none of the ideas below are good enough to be submissions in their
own right (so don't copy and paste)! We'll want to know not just what you want
to do but how you plan to pull it off.

Don't feel limited to the ideas below -- if you've got a cool project you want
to work on, we'll probably be able to find you a mentor. We plan on approving
as many projects as we possibly can.

We're accepting any GSOC proposal that fits one of the following three categories:

  * Work on Django itself - such as the ORM, forms, etc. This is what we've traditionally accepted GSoC entries in.
  * Work on tools to support Django - the dashboard (https://dashboard.djangoproject.com/) is a good example of an existing tool that would have fit into this category.
  * Work on libraries that supplement or add new features to Django to ease development - South and Django Debug Toolbar are good examples of existing projects that would have fit here.

Unless explicitly mentioned below, we're **not** looking for people to work on
existing third-party libraries - we aren't able to guarantee commit access to
them. We may allow an exception if a maintainer of the library in question
agrees to help mentor beforehand.

The broadening in scope is to allow people to work on new ideas to help Django
development and developers without tying you down to having to implement it in
the core codebase (and thus ruling out some projects that might otherwise be
useful).

We're still going to be strict with what we accept - you'll need to provide a
strong use case for your idea and show that it would be useful to a majority of
developers or significantly improve the development of Django itself.

We're not looking for small groups of incremental updates - like "improve
Django's Trac" - nor are we looking for impossible tasks, like "replace Trac
with this brand new issue tracker I'm writing". What you propose should be a
single project, achievable within the time period of GSoC, and something the
core developers can help mentor you on.

We're also not looking for sites or projects that are merely written in Django
- this GSoC is not for you to propose your new forum hosting site or amazing
Django-based blogging engine.

Note that when you contribute code, you will be expected to adhere to the same
contribution guidelines as any other code contributor. This means you will be
expected to provide extensive tests and documentation for any feature you add,
you will be expected to participate in discussion on
[http://groups.google.com/group/django-developers django-developers] and the
[https://forum.djangoproject.com Django Forum] when your topic of interest is
raised. If you're not already familiar with
[http://docs.djangoproject.com/en/dev/internals/contributing/ Django's
contribution guidelines], now would be a good time to read them - even if
you're not applying to work on Django core directly, we'll still want the same
level of contribution.

== How can I improve my chances of being accepted? ==

The best thing you can do to improve your chances to be accepted as a Django
GSoC student is to start contributing now. Read up on
[https://docs.djangoproject.com/en/dev/internals/contributing/ Django’s
contribution documentation] and make yourself known to the core team by your
contributions (ideally, related to the area of your proposal). That way, when
it comes time to evaluate student applications, you’ll be a known individual
and more likely to be able to get the attention you need to develop a proposal.

We're looking for candidates who can demonstrate that they can engage in work
of a project scope on an independent basis. We're there to help but we can't
watch you every step of the way, so we need to see that motivation from you.
Being active before the submissions process is the best way to demonstrate
this.

== Communication ==

All GSOC-related communication is handled via the [https://forum.djangoproject.com/c/internals/mentorship/10 Django Forum, in
the Mentoring channel]. Any proposals for GSOC should be submitted there, as
well as discussion on the proposed projects and any updates that students post.

Please be careful to keep content to the forum clear and purposeful; if you
have an idea, update, or criticism, please make sure you describe it in detail;
it can be tedious asking people to clarify any vague statements.

== Ideas ==

Here are some suggestions for projects students may want to propose (please
feel free add to this list!). This isn't by any means the be-all and end-all of
ideas; please feel free to submit proposals for things not on this list.
Remember, we'd much prefer that you posted a draft proposal and your rough
timeline / success conditions to the the [https://forum.djangoproject.com/c/internals/mentorship/10 Django Forum, in
the Mentoring channel] or [http://groups.google.com/group/django-developers django-developers list],
even if it's already on the list below; it will help you get feedback on
choosing the right part of a problem, as well as helping to see if there is any
interest before you start drafting a full proposal.

When developing your proposal, try to scope ideas/proposals to size of your project (175hrs or 350hrs) -- you need to be ambitious, but not too ambitious. The GSoC does not
cover activities other than coding, so certain ideas ("Write a more detailed
tutorial" or "Create demonstration screencasts") are not suitable for inclusion
here.

On the other side, though, be sure to be concrete in your proposal. We'll want
to know what your goals are, and how you plan to accomplish them.

In no particular order:

== Database Connection Pool ==

Difficulty: Hard
Size:       350hrs
Potential Mentors: "Florian Apolloner", "Carlton Gibson"

Django's persistent database connections do not function correctly under ASGI, for asynchronous code. As such we need a connection pool solution.

There are per-database solutions out there, e.g. PG Bouncer for PostgreSQL. Can we wrap those, or provide our own implementation if needed?

A proposal here will show awareness of the prior art, and the difficulties involved. (Background reading: https://github.com/brettwooldridge/HikariCP/blob/dev/documents/Welcome-To-The-Jungle.md and https://www.psycopg.org/articles/2021/01/17/pool-design/)


== Auto-importing shell ==

Difficulty: Medium
Size:       175hrs
Potential Mentors: "Adam Johnson"

One of the most popular features of django-extensions is `shell_plus`, which is like `shell` but auto-imports your models for you. Adding this behaviour to core would be a great addition.

A proposal should consider ways to define extra things to import, perhaps a documented path of subclassing the management command and overriding a method.


== Security: Bring CORS and CSP into core ==

Difficulty: Medium
Size:       350hrs
Potential Mentors: "Adam Johnson", "James Bennett"

There are third-party apps providing support for Cross-Origin Resource Sharing (CORS) `django-cors-headers` and Content Security Policy (CSP) `django-csp `, but it would be good to have support built-in to core.

Following the design of the CSRF/clickjacking protection, having safe defaults, and allowing straightforward per-path customisation, via e.g. decorators, would improve the security of all Django projects.

== Migrations ==

Here are a couple project ideas for improving Django's migrations framework.

For both projects:

Difficulty: Hard.
Size:       350hrs
Potential Mentors: "Shai Berger"

=== Moving models between apps ===

Support moving models between apps. This is a long-standing problem, esp. in
enterprise-y or just long-running projects. It's not simple and requires custom
migration operations to perform.

It has been discussed previously:  https://forum.djangoproject.com/t/why-do-we-need-apps/827/20

=== Audo-detection of custom migration operations ===

Allow auto-detection of custom migration operations.

The auto-detector has its change-detection mostly hard-coded:
https://github.com/django/django/blob/main/django/db/migrations/autodetector.py#L104

It doesn't seem easy (or even possible with the current approach) to
allow third-party code to intervene.

A proposal here would need to demonstrate a plan for a route forward.

Note: These two projects are quite independent. Auto-detection of the fact that
a model has moved between apps is not required, supporting such moves with
flags to makemigrations or even a dedicated management-command would be
completely satisfactory.


- [SummerOfCode2022 (Edit) – Django](https://code.djangoproject.com/wiki/SummerOfCode2022?action=edit)
- [WikiFormatting – Django](https://code.djangoproject.com/wiki/WikiFormatting)



== Improve the Database Cache Backend ==

Difficulty: Medium.
Size:       350hrs
Potential Mentors: "Adam Johnson"

Setting up a shared cache backend is nearly always required, as many
third-party packages assume the cache works like this (unlike the default
locmemcache which is per process). DatabaseCache is the easiest such cache
backend, not requiring any extra infra and working on shared hosts without a
filesystem. But it could be better.

Django-Mysql has had a much better DB cache backend implementation since 2015: https://adamj.eu/tech/2015/05/17/building-a-better-databasecache-for-django-on-mysql/ . This has never been adapted for the other supported databases but it should be fairly straightforward, mostly some translation of SQL to different dialects.

As a stretch goal, it would also be nice to hook the database cache tables into
migrations somehow rather than the current hacky duck typing approach:
https://github.com/django/django/blob/64b3c413da011f55469165256261f406a277e822/
django/core/cache/backends/db.py#L12-L28 ).


== Typed Django ==

There are several potential projects related to typing and the django-stubs project.

For all three projects:

Difficulty: Hard.
Size:       175hrs
Potential Mentors: "Adam Johnson"

=== Strict-mode support for django-stubs ===

The django-stubs implementation does not currently pass Mypy’s strict mode.

Making this compliant would enable users to always use strict mode with them, improving type safety.

=== Merging django-types back into django-stubs ===

There is a spin-off project from django-stubs called django-types. The original intention here was for it to be merged back into django-stubs, but that's never happened.

django-types removes the need to use any mypy plugins, making it possible to use type checkers other than mypy, such as Pyrite, Pyre, etc.

django-types is not actively maintained, however, and having competing stubs implementations means neither is as strong as could be.

There is a small project in extracting the work from django-types and creating a PR for django-stubs allowing it to be merged back in, and effort to be concentrated on the single implementation.

=== Exploratory proof-of-concept for typing Django core ===

Since type annotations were added to Python, there has been discussion of when and whether they should be added to Django.

In 2019 a proposal to add inline type hints was rejected. (See https://github.com/django/deps/pull/65 and links therein.)

Since then there has been improvements in the typing landscape, and more people in the community are using type hints regularly in their own projects.

It remains difficult, though, to judge whether it's now time to reassess that earlier decision.

An exploratory proof-of-concept project applying type hints to some of the //leaf// modules in Django (those without further dependencies) — perhaps utils, the forms widgets and into fields, or inside the SQL compiler of the ORM — would enable us to see what the decision to adopt inline type hints would amount to.

Such a project would need to:

- Add readable type-hints, making good use type alises, Protocols, and so on.
- Configure mypy validation for the adjusted files, on CI, pre-commit, and for local development.
- Add typing to the relevant tests cases, and apply type checking there too.
 
The goal would be a PR showing what an incremental adoption of inline typing would like for Django in 2023, to serve as the basis of a fresh discussion of whether to adopt typing more generally.


== Configurable Content Type Parsing ==

Difficulty: Medium.
Size:       350hrs
Potential Mentors: "Carlton Gibson"

For Django 5.0 we're looking to modernize the `HTTPRequest` object, adding a content-type aware `request.data` property. This will parse `request.body` according to the content type.

The initial phase — targeted for before GSoC — will add `request.data` and add support for JSON body handling, but the next phase is to make that fully pluggable with custom parsers.

- Add a list of parsers to the request object, that can be customised — in a middleware for example — at any point prior to accessing `request.data`.
- Parsers should implement a `can_handle(content_type) -> Bool` method. The first parser returning True will be selected to parse the `request.body`.


== Window expressions improvements ==

Add support for filtering against window expressions (see #28333), for `EXCLUDE` and currently not covered `RowRange()` cases (see #29850).

Hard project. 350hr project

Would require knowledge of the Django ORM, and the supported databases.

Expected outcome would be a PR (or a number of them) on the ORM.

Possible mentor: ''Mariusz Felisiak''.



== Database-level Cascades ==

Difficulty: Medium
Size:       350hr
Possible mentors: ''Mariusz Felisiak''.

There's an old ticket to [https://code.djangoproject.com/ticket/21961 Add support for database-level cascading options].
This means that rather than Django's in-Python options for `on_delete` clauses, we'd allow the database to handle this with it's native implementation.
This would be a new option `db_on_delete` maybe, with the existing `on_delete` being `DO_NOTHING` if it were used.

This had a couple of PRs that were in the right direction ([https://github.com/django/django/pull/14550 1], [https://github.com/django/django/pull/8661 2]), and [https://groups.google.com/g/django-developers/c/FJMoGgtYIX4/m/LTdjlWydJ2EJ a long-discussion on django-developers].

A effective first-pass here for a single database backend can be done creating
a `ForeignKey` subclass setting a flag, and then overriding
`DatabaseSchemaEditor` `add_field()` and `sql_create_fk()` to detect that,
adjusting the generated SQL accordingly. (Try it!)

The project would be to make that work generally, for all database backends,
and integrate with the migrations framework.

Would require knowledge of the Django ORM, SQL, and the supported database
backends. Significant work has already gone into the project, so research of
the links given would be needed.

Expected outcome would be a PR adding support for Database-level Cascades to
the Django ORM.

== Add Async Support to Django Debug Toolbar ==

Difficulty: Medium.
Size:       350hr
Possible mentors: ''Tim Schilling''/''Carlton Gibson''.

Django Debug Toolbar (DDT) is one of the key packages in the Django ecosystem.

https://github.com/jazzband/django-debug-toolbar

DDT is not yet compatibile with Django Channels and async Django run unders ASGI.
Adding support for async to DDT would be a great contribution.

Preliminary implementation ideas for this are available here: https://github.com/jazzband/django-debug-toolbar/pull/1432

Would require some knowledge of asyncio, Django Channels, ASGI, and how the Django Debug Toolbar works.

Expected outcome would be a PR (or multiple PRs) moving the toolbar towards full compatibility with Django channels and async logic.



== Or Create Your Own ==


We have around 900 accepted tickets on Django. Browse the issue tracker by
component — here's an
[https://code.djangoproject.com/query?status=assigned&status=new&component=contrib.staticfiles&col=id&col=summary&col=status&col=owner&col=type&col=component&col=version&desc=1&order=id example filter for contrib.staticfiles]. What's the bit of the framework that interests you?
What contribution do you want to make to it?

Use the tickets as guides here. Remember the advice above, that your project
needs to be both on Django itself here, and achievable in the timescale of
GSoC.

Could be scoped as a 175hr or a 350hr project, depending on your idea.

Possible mentors: ''Carlton Gibson'', ''Mariusz Felisiak''.