django-postgres-lookups-any

Provides =ANY(ARRAY(xxx)) instead of IN (xxx)

Documentation

This library is designed for Postgres. It enables developers to cope with problem when Postgres doesn't use indexes with long IN () statements.

Usually, when you try to do a query:

SELECT a.* FROM a
WHERE a.id NOT IN (
    SELECT b.id FROM b
)

You expect that it will be used index on a.id. Unfortunately, it doesn't work.

There is a trick to make Postgres do it by rewritten query this way:

SELECT a.* FROM a
WHERE a.id=ANY(ARRAY(SELECT b.id FROM b))

This library allows you to use this statement. Examples:

"""
SELECT * FROM mymodel WHERE somefield=ANY([1, 2, 3])
"""
MyModel.objects.filter(somefield__any_arr=[1, 2, 3])

"""
SELECT * FROM mymodel WHERE somefield=ANY(ARRAY(SELECT somefield FROM modelb))
"""
subquery = Subquery(model_b__instances.values('somefield'))
MyModel.objects.filter(somefield__any=subquery)

Quickstart

Install django-postgres-lookups-any:

pip install django-postges-lookups-any

Add it to your INSTALLED_APPS:

INSTALLED_APPS = (
    ...
    'django_postges_lookups_any',
    ...
)

Running Tests

Does the code actually work?

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

Development commands

pip install -r requirements_dev.txt

Credits

Tools used in rendering this package:

• Cookiecutter
• cookiecutter-djangopackage