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267 lines
11 KiB
Plaintext
==================
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Submitting patches
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==================
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We're always grateful for patches to Django's code. Indeed, bug reports
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with associated patches will get fixed *far* more quickly than those
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without patches.
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Typo fixes and trivial documentation changes
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--------------------------------------------
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If you are fixing a really trivial issue, for example changing a word in the
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documentation, the preferred way to provide the patch is using GitHub pull
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requests without a Trac ticket. Trac tickets are still acceptable.
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See the :doc:`working-with-git` for more details on how to use pull requests.
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"Claiming" tickets
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------------------
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In an open-source project with hundreds of contributors around the world, it's
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important to manage communication efficiently so that work doesn't get
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duplicated and contributors can be as effective as possible.
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Hence, our policy is for contributors to "claim" tickets in order to let other
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developers know that a particular bug or feature is being worked on.
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If you have identified a contribution you want to make and you're capable of
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fixing it (as measured by your coding ability, knowledge of Django internals
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and time availability), claim it by following these steps:
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* `Create an account`_ to use in our ticket system. If you have an account
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but have forgotten your password, you can reset it using the
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`password reset page`_.
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* If a ticket for this issue doesn't exist yet, create one in our
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`ticket tracker`_.
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* If a ticket for this issue already exists, make sure nobody else has
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claimed it. To do this, look at the "Owned by" section of the ticket.
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If it's assigned to "nobody," then it's available to be claimed.
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Otherwise, somebody else is working on this ticket, and you either find
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another bug/feature to work on, or contact the developer working on the
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ticket to offer your help.
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* Log into your account, if you haven't already, by clicking "Login" in
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the upper right of the ticket page.
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* Claim the ticket:
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1. click the "assign to myself" radio button under "Action" near the bottom of the
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page,
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2. then click "Submit changes."
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.. note::
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The Django software foundation requests that anyone contributing more than
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a trivial patch to Django sign and submit a `Contributor License
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Agreement`_, this ensures that the Django Software Foundation has clear
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license to all contributions allowing for a clear license for all users.
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.. _Create an account: https://www.djangoproject.com/accounts/register/
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.. _password reset page: https://www.djangoproject.com/accounts/password/reset/
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.. _Contributor License Agreement: https://www.djangoproject.com/foundation/cla/
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Ticket claimers' responsibility
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Once you've claimed a ticket, you have a responsibility to work on that ticket
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in a reasonably timely fashion. If you don't have time to work on it, either
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unclaim it or don't claim it in the first place!
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If there's no sign of progress on a particular claimed ticket for a week or
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two, another developer may ask you to relinquish the ticket claim so that it's
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no longer monopolized and somebody else can claim it.
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If you've claimed a ticket and it's taking a long time (days or weeks) to code,
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keep everybody updated by posting comments on the ticket. If you don't provide
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regular updates, and you don't respond to a request for a progress report,
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your claim on the ticket may be revoked.
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As always, more communication is better than less communication!
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Which tickets should be claimed?
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Of course, going through the steps of claiming tickets is overkill in some
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cases.
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In the case of small changes, such as typos in the documentation or
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small bugs that will only take a few minutes to fix, you don't need to jump
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through the hoops of claiming tickets. Just submit your patch and be done with
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it.
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Of course, it is *always* acceptable, regardless whether someone has claimed it
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or not, to submit patches to a ticket if you happen to have a patch ready.
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.. _patch-style:
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Patch style
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-----------
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Make sure that any contribution you do fulfills at least the following
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requirements:
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* The code required to fix a problem or add a feature is an essential part
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of a patch, but it is not the only part. A good patch should also include a
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:doc:`regression test <unit-tests>` to validate the behavior that has been
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fixed and to prevent the problem from arising again. Also, if some tickets
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are relevant to the code that you've written, mention the ticket numbers in
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some comments in the test so that one can easily trace back the relevant
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discussions after your patch gets committed, and the tickets get closed.
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* If the code associated with a patch adds a new feature, or modifies
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behavior of an existing feature, the patch should also contain
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documentation.
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You can use either GitHub branches and pull requests or direct patches
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to publish your work. If you use the Git workflow, then you should
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announce your branch in the ticket by including a link to your branch.
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When you think your work is ready to be merged in create a pull request.
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See the :doc:`working-with-git` documentation for mode details.
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You can also use patches in Trac. When using this style, follow these
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guidelines.
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* Submit patches in the format returned by the ``git diff`` command.
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An exception is for code changes that are described more clearly in
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plain English than in code. Indentation is the most common example; it's
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hard to read patches when the only difference in code is that it's
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indented.
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* Attach patches to a ticket in the `ticket tracker`_, using the "attach
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file" button. Please *don't* put the patch in the ticket description
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or comment unless it's a single line patch.
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* Name the patch file with a ``.diff`` extension; this will let the ticket
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tracker apply correct syntax highlighting, which is quite helpful.
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Regardless of the way you submit your work, follow these steps.
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* Make sure your code matches our :doc:`coding-style`.
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* Check the "Has patch" box on the ticket details. This will make it
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obvious that the ticket includes a patch, and it will add the ticket to
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the `list of tickets with patches`_.
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Non-trivial patches
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-------------------
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A "non-trivial" patch is one that is more than a simple bug fix. It's a patch
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that introduces Django functionality and makes some sort of design decision.
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If you provide a non-trivial patch, include evidence that alternatives have
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been discussed on |django-developers|.
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If you're not sure whether your patch should be considered non-trivial, just
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ask.
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Deprecating a feature
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---------------------
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There are a couple reasons that code in Django might be deprecated:
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* If a feature has been improved or modified in a backwards-incompatible way,
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the old feature or behavior will be deprecated.
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* Sometimes Django will include a backport of a Python library that's not
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included in a version of Python that Django currently supports. When Django
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no longer needs to support the older version of Python that doesn't include
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the library, the library will be deprecated in Django.
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As the :ref:`deprecation policy<internal-release-deprecation-policy>` describes,
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the first release of Django that deprecates a feature (``A.B``) should raise a
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``RemovedInDjangoXXWarning`` (where XX is the Django version where the feature
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will be removed) when the deprecated feature is invoked. Assuming
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we have a good test coverage, these warnings will be shown by the test suite
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when :ref:`running it <running-unit-tests>` with warnings enabled:
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``python -Wall runtests.py``. This is annoying and the output of the test suite
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should remain clean. Thus, when adding a ``RemovedInDjangoXXWarning`` you need
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to eliminate or silence any warnings generated when running the tests.
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The first step is to remove any use of the deprecated behavior by Django itself.
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Next you can silence warnings in tests that actually test the deprecated
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behavior in one of two ways:
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#) In a particular test::
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import warnings
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def test_foo(self):
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with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter("always")
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# invoke deprecated behavior
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# go ahead with the rest of the test
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#) For an entire test case, ``django.test.utils`` contains three helpful
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mixins to silence warnings: ``IgnorePendingDeprecationWarningsMixin``,
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``IgnoreDeprecationWarningsMixin``, and
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``IgnoreAllDeprecationWarningsMixin``. For example::
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from django.test.utils import IgnorePendingDeprecationWarningsMixin
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class MyDeprecatedTests(IgnorePendingDeprecationWarningsMixin, unittest.TestCase):
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...
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Finally, there are a couple of updates to Django's documentation to make:
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#) If the existing feature is documented, mark it deprecated in documentation
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using the ``.. deprecated:: A.B`` annotation. Include a short description
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and a note about the upgrade path if applicable.
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#) Add a description of the deprecated behavior, and the upgrade path if
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applicable, to the current release notes (``docs/releases/A.B.txt``) under
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the "Features deprecated in A.B" heading.
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#) Add an entry in the deprecation timeline (``docs/internals/deprecation.txt``)
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under the ``A.B+2`` version describing what code will be removed.
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Once you have completed these steps, you are finished with the deprecation.
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In each minor release, all ``RemovedInDjangoXXWarning``\s matching the new
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version are removed.
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Javascript patches
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------------------
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Django's admin system leverages the jQuery framework to increase the
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capabilities of the admin interface. In conjunction, there is an emphasis on
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admin javascript performance and minimizing overall admin media file size.
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Serving compressed or "minified" versions of javascript files is considered
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best practice in this regard.
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To that end, patches for javascript files should include both the original
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code for future development (e.g. ``foo.js``), and a compressed version for
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production use (e.g. ``foo.min.js``). Any links to the file in the codebase
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should point to the compressed version.
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Compressing JavaScript
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~~~~~~~~~~~~~~~~~~~~~~
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To simplify the process of providing optimized javascript code, Django
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includes a handy python script which should be used to create a "minified"
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version. To run it::
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python django/contrib/admin/bin/compress.py
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Behind the scenes, ``compress.py`` is a front-end for Google's
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`Closure Compiler`_ which is written in Java. However, the Closure Compiler
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library is not bundled with Django directly, so those wishing to contribute
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complete javascript patches will need to download and install the library
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independently.
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The Closure Compiler library requires Java version 6 or higher (Java 1.6 or
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higher on Mac OS X. Note that Mac OS X 10.5 and earlier did not ship with
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Java 1.6 by default, so it may be necessary to upgrade your Java installation
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before the tool will be functional. Also note that even after upgrading Java,
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the default ``/usr/bin/java`` command may remain linked to the previous Java
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binary, so relinking that command may be necessary as well.)
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Please don't forget to run ``compress.py`` and include the ``diff`` of the
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minified scripts when submitting patches for Django's javascript.
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.. _Closure Compiler: https://developers.google.com/closure/compiler/
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.. _list of tickets with patches: https://code.djangoproject.com/query?status=new&status=assigned&status=reopened&has_patch=1&order=priority
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.. _ticket tracker: https://code.djangoproject.com/newticket
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