A BitField extension for Django Models - with Python2.5 support
Python
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bitfield
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LICENSE
MANIFEST.in
README.rst
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setup.py

README.rst

django-bitfield

Provides a BitField like class (using a BigIntegerField) for your Django models.

(If you're upgrading from a version before 1.2 the API has changed greatly and is backwards incompatible!)

Requirements

  • Django >= 1.2

Note: SQLite does not support save operations using a Bit (per the example under Usage)

Installation

Install it with pip (or easy_install):

pip install django-bitfield

Usage

First you'll need to attach a BitField to your class. This acts as a BigIntegerField (BIGINT) in your database:

from bitfield import BitField

class MyModel(models.Model):
    flags = BitField(flags=(
        'awesome_flag',
        'flaggy_foo',
        'baz_bar',
    ))

Now you can use the field using very familiar Django operations:

# Create the model
o = MyModel.objects.create(flags=0)

# Add awesome_flag (does not work in SQLite)
MyModel.objects.filter(pk=o.pk).update(flags=F('flags') | MyModel.flags.awesome_flag)

# Set flags manually to [awesome_flag, flaggy_foo]
MyModel.objects.filter(pk=o.pk).update(flags=MyModel.flags.awesome_flag | MyModel.flags.flaggy_foo)

# Remove awesome_flag (does not work in SQLite)
MyModel.objects.filter(pk=o.pk).update(flags=F('flags') & ~MyModel.flags.awesome_flag)

# Find by awesome_flag
MyModel.objects.filter(flags=MyModel.flags.awesome_flag)

# Exclude by awesome_flag
MyModel.objects.filter(flags=~MyModel.flags.awesome_flag)

# Test awesome_flag
if o.flags.awesome_flag:
    print "Happy times!"

# List all flags on the field
for f in o.flags:
    print f

Enjoy!