Django 1.0 release notes¶

Re-factored admin application¶

The Django administrative interface (django.contrib.admin) has been completely refactored; admin definitions are now completely decoupled from model definitions (no more class Admin declaration in models!), rewritten to use Django’s new form-handling library (introduced in the 0.96 release as django.newforms, and now available as simply django.forms) and redesigned with extensibility and customization in mind. Full documentation for the admin application is available online in the official Django documentation:

See the admin reference for details

Improved Unicode handling¶

Django’s internals have been refactored to use Unicode throughout; this drastically simplifies the task of dealing with non-Western-European content and data in Django. Additionally, utility functions have been provided to ease interoperability with third-party libraries and systems which may or may not handle Unicode gracefully. Details are available in Django’s Unicode-handling documentation.

See Unicode data.

An improved ORM¶

Django’s object-relational mapper – the component which provides the mapping between Django model classes and your database, and which mediates your database queries – has been dramatically improved by a massive refactoring. For most users of Django this is backwards-compatible; the public-facing API for database querying underwent a few minor changes, but most of the updates took place in the ORM’s internals. A guide to the changes, including backwards-incompatible modifications and mentions of new features opened up by this refactoring, is available on the Django wiki.

Automatic escaping of template variables¶

To provide improved security against cross-site scripting (XSS) vulnerabilities, Django’s template system now automatically escapes the output of variables. This behavior is configurable, and allows both variables and larger template constructs to be marked as safe (requiring no escaping) or unsafe (requiring escaping). A full guide to this feature is in the documentation for the autoescape tag.

django.contrib.gis (GeoDjango)¶

A project over a year in the making, this adds world-class GIS (Geographic Information Systems) support to Django, in the form of a contrib application. Its documentation is currently being maintained externally, and will be merged into the main Django documentation shortly. Huge thanks go to Justin Bronn, Jeremy Dunck, Brett Hoerner and Travis Pinney for their efforts in creating and completing this feature.

See http://geodjango.org/ for details.

Pluggable file storage¶

Django’s built-in FileField and ImageField now can take advantage of pluggable file-storage backends, allowing extensive customization of where and how uploaded files get stored by Django. For details, see the files documentation; big thanks go to Marty Alchin for putting in the hard work to get this completed.

Jython compatibility¶

Thanks to a lot of work from Leo Soto during a Google Summer of Code project, Django’s codebase has been refactored to remove incompatibilities with Jython, an implementation of Python written in Java, which runs Python code on the Java Virtual Machine. Django is now compatible with the forthcoming Jython 2.5 release.

See Running Django on Jython.

Generic relations in forms and admin¶

Classes are now included in django.contrib.contenttypes which can be used to support generic relations in both the admin interface and in end-user forms. See the documentation for generic relations for details.

INSERT/UPDATE distinction¶

Although Django’s default behavior of having a model’s save() method automatically determine whether to perform an INSERT or an UPDATE at the SQL level is suitable for the majority of cases, there are occasional situations where forcing one or the other is useful. As a result, models can now support an additional parameter to save() which can force a specific operation.

See Forcing an INSERT or UPDATE for details.

Split CacheMiddleware¶

Django’s CacheMiddleware has been split into three classes: CacheMiddleware itself still exists and retains all of its previous functionality, but it is now built from two separate middleware classes which handle the two parts of caching (inserting into and reading from the cache) separately, offering additional flexibility for situations where combining these functions into a single middleware posed problems.

Full details, including updated notes on appropriate use, are in the caching documentation.

Refactored django.contrib.comments¶

As part of a Google Summer of Code project, Thejaswi Puthraya carried out a major rewrite and refactoring of Django’s bundled comment system, greatly increasing its flexibility and customizability. Full documentation is available, as well as an upgrade guide if you were using the previous incarnation of the comments application.

Removal of deprecated features¶

A number of features and methods which had previously been marked as deprecated, and which were scheduled for removal prior to the 1.0 release, are no longer present in Django. These include imports of the form library from django.newforms (now located simply at django.forms), the form_for_model and form_for_instance helper functions (which have been replaced by ModelForm) and a number of deprecated features which were replaced by the dispatcher, file-uploading and file-storage refactorings introduced in the Django 1.0 alpha releases.

Multi-table model inheritance with to_field¶

If you’re using multiple table model inheritance, be aware of this caveat: child models using a custom parent_link and to_field will cause database integrity errors. A set of models like the following are not valid:

class Parent(models.Model):
    name = models.CharField(max_length=10)
    other_value = models.IntegerField(unique=True)

class Child(Parent):
    father = models.OneToOneField(Parent, primary_key=True, to_field="other_value", parent_link=True)
    value = models.IntegerField()

This bug will be fixed in the next release of Django.

Caveats with support of certain databases¶

Django attempts to support as many features as possible on all database backends. However, not all database backends are alike, and in particular many of the supported database differ greatly from version to version. It’s a good idea to checkout our notes on supported database:

• MySQL notes
• SQLite notes
• Oracle notes