django_polymorphic 0.7.1

Seamless Polymorphic Inheritance for Django Models

Polymorphic Models for Django

Django-polymorphic simplifies using inherited models in Django projects. When a query is made at the base model, the inherited model classes are returned.

When we store models that inherit from a Project model...

>>> Project.objects.create(topic="Department Party")
>>> ArtProject.objects.create(topic="Painting with Tim", artist="T. Turner")
>>> ResearchProject.objects.create(topic="Swallow Aerodynamics", supervisor="Dr. Winter")

...and want to retrieve all our projects, the subclassed models are returned!

>>> Project.objects.all()
    [ <Project:         id 1, topic "Department Party">,
      <ArtProject:      id 2, topic "Painting with Tim", artist "T. Turner">,
      <ResearchProject: id 3, topic "Swallow Aerodynamics", supervisor "Dr. Winter"> ]

Using vanilla Django, we get the base class objects, which is rarely what we wanted:

>>> Project.objects.all()
    [ <Project: id 1, topic "Department Party">,
      <Project: id 2, topic "Painting with Tim">,
      <Project: id 3, topic "Swallow Aerodynamics"> ]

This also works when the polymorphic model is accessed via ForeignKeys, ManyToManyFields or OneToOneFields.

Features

  • Full admin integration.
  • ORM integration:
  • support for ForeignKey, ManyToManyField, OneToOneField descriptors.
  • Filtering/ordering of inherited models (ArtProject___artist).
  • Filtering model types: instance_of(...) and not_instance_of(...)
  • Combining querysets of different models (qs3 = qs1 | qs2)
  • Support for custom user-defined managers.
  • Uses the minumum amount of queries needed to fetch the inherited models.
  • Disabling polymorphic behavior when needed.

While django-polymorphic makes subclassed models easy to use in Django, we still encourage to use them with caution. Each subclassed model will require Django to perform an INNER JOIN to fetch the model fields from the database. While taking this in mind, there are valid reasons for using subclassed models. That's what this library is designed for!

For more information, see the documentation at Read the Docs.

License

Django-polymorphic uses the same license as Django (BSD-like).

BSD

Author

Christopher Glass

Pip

django_polymorphic==0.7.1

Classifiers

  • Development Status :: 5 - Production/Stable
  • Framework :: Django
  • Intended Audience :: Developers
  • Operating System :: OS Independent
  • Programming Language :: Python
  • Programming Language :: Python :: 2.6
  • Programming Language :: Python :: 2.7
  • Programming Language :: Python :: 3.3
  • License :: OSI Approved :: BSD License
  • Topic :: Software Development :: Libraries :: Python Modules
  • Framework :: Django :: 1.6
  • Framework :: Django :: 1.7
  • Framework :: Django :: 1.8
  • Framework :: Django :: 1.4
  • Framework :: Django :: 1.5
File Type Python Version Uploaded On Downloads
django_polymorphic-0.7.1.tar.gz Source April 30, 2015 6,509
django_polymorphic-0.7.1-py2.py3-none-any.whl Wheel 2.7 April 30, 2015 60,222
Version Release Date
0.7.1 April 30, 2015
0.7 April 13, 2015
0.6.1 Dec. 30, 2014
0.6 Oct. 14, 2014
0.5.6 July 21, 2014
0.5.5 April 29, 2014
0.5.4 April 9, 2014
0.5.3 Sept. 18, 2013
0.5.2 Sept. 5, 2013
0.5.1 July 5, 2013
0.5 May 20, 2013
0.4.2 April 10, 2013
0.4.0 March 25, 2013
0.3.1 Feb. 28, 2013
0.2 April 27, 2011
Date Package Version Action
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.5.3 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.5.2 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.5.1 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.2 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.7.1 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.5.6 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.5.5 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.5.4 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.4.0 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.6 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.7 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.5 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.3.1 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.6.1 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic 0.4.2 Release Created
Aug. 26, 2015, 12:21 a.m. django_polymorphic Package Created