Welcome to Django Reorder’s documentation!¶

Documentation¶

The full documentation is at https://django-reorder.readthedocs.org.

Quickstart¶

Install Django Reorder:

pip install django-reorder

Then use it in a project:

from django_reorder.reorder import reorder

Tshirt.objects.order_by(reorder(size=['S', 'M', 'L']))

Some more detailed examples can be foind on the Usage page.

Features¶

• Can be used in order_by() and in annotate() calls.
• Works across relationships.
• Lets you control the sorting order of NULL values explicitly (otherwise it can vary across databases).

Running Tests¶

Does the code actually work?

source <YOURVIRTUALENV>/bin/activate
(myenv) $ pip install -r requirements_test.txt
(myenv) $ python runtests.py

Credits¶

Tools used in rendering this package:

• Cookiecutter
• cookiecutter-djangopackage

Reference¶

django_reorder.reorder.reorder(<fieldname>=<new order>, _default=AFTER, _reverse=False)[source]¶

This function generates a query expression (suitable for passing directly in order_by or annotate) that will sort the queryset by the given <fieldname> so that rows appear in the order given by <new_order>.

It takes two optional parameters (their names are prefixed by an underscore to prevent clashing with potential field names):

• _default controls whether values that don’t appear in <new order> are sorted before or after (the default) those that do. Use the BEFORE and AFTER constants that can be imported from the module.
• _reverse lets you reverse the sorting.

django_reorder.reorder.null_first(fieldname)[source]¶

This function is a small wrapper around reorder() and lets you control the sorting order of NULL values for a given field (otherwise your database will decide whether to put NULL values at the beginning or at the end, and different databases do it differently).

It takes a single required argument: the name of the field (as a string) whose NULL values should be sorted first.

class Tshirt(models.Model):

... purchased_on = models.DateTimeField(blank=True, null=True)

# This will yield all Tshirt objects and those without a purchase date # will be listed first: Tshirt.objects.order_by(null_first(‘purchased_on’))

# You can also combine null_first() with other sorting fields. # For example this will sort Tshirt by their purchase date but it will list # T-shirts without a purchase date first: Tshirt.objects.order_by(null_first(‘purchased_on’), ‘purchased_on’)

django_reorder.reorder.null_last(fieldname)[source]¶

Works exactly like null_first, except that NULL values are sorted at the end.

Types of Contributions¶

Get Started!¶

Ready to contribute? Here’s how to set up django-reorder for local development.

1. Fork the django-reorder repo on GitHub.

2. Clone your fork locally:

   $ git clone git@github.com:your_name_here/django-reorder.git
   

3. Install your local copy into a virtualenv. Assuming you have virtualenvwrapper installed, this is how you set up your fork for local development:

   $ mkvirtualenv django-reorder
   $ cd django-reorder/
   $ python setup.py develop
   

4. Create a branch for local development:

   $ git checkout -b name-of-your-bugfix-or-feature
   

   Now you can make your changes locally.

5. When you’re done making changes, check that your changes pass flake8 and the tests, including testing other Python versions with tox:

   $ flake8 django_reorder tests
   $ python setup.py test
   $ tox
   

   To get flake8 and tox, just pip install them into your virtualenv.

6. Commit your changes and push your branch to GitHub:

   $ git add .
   $ git commit -m "Your detailed description of your changes."
   $ git push origin name-of-your-bugfix-or-feature
   

7. Submit a pull request through the GitHub website.

Pull Request Guidelines¶

Before you submit a pull request, check that it meets these guidelines:

1. The pull request should include tests.
2. If the pull request adds functionality, the docs should be updated. Put your new functionality into a function with a docstring, and add the feature to the list in README.rst.
3. The pull request should work for Python 2.6, 2.7, and 3.3, and for PyPy. Check https://travis-ci.org/bmispelon/django-reorder/pull_requests and make sure that the tests pass for all supported Python versions.

Tips¶

To run a subset of tests:

$ python -m unittest tests.test_django_reorder

Development Lead¶

• Baptiste Mispelon <bmispelon@gmail.com>

Contributors¶

None yet. Why not be the first?

0.2.1 (2016-09-13)¶

• Forgot to pull before I ``push``ed...

0.2.0 (2016-09-13)¶

• Added null_first() and null_last() shortcuts.

0.1.0 (2016-07-26)¶

• First release on PyPI.