Bugfixes and Beyond

Jannis Leidel

Django Usergroup BerlinApril 5, 2011

1.3“bugfix release”

How many fixes?*

1,330 changed files

85,030 additions

39,884 deletions

* translation updates excluded

What‘s removed?

AdminSite.root()

Authentication backends that don’t support anonymous users and object permissions.

See http://django.me/deprecation for past present and future deprecation

Security fixes!Added CSRF validation for AJAX requests.

Placed restrictions on filters in the admin interface.

Stopped rendering passwords in PasswordInput.

Stopped allowing password resets for inactive accounts.

Data loss bugs, yikes!

FileField file deletion.

See https://gist.github.com/889692

Backwards incompatibleClearable FileField widget is default (override it if you want the old behavior).

No more PROFANITIES_LIST

Localflavor corrections for Canada, Indonesia, and the USA.

FormSets can no longer take empty data.

Initial SQL no longer works in tests (use fixtures instead)

What‘s new?Class-based views

Logging

Static files

Caching

Internationalization

and many more…

Class-based views

Hello, view!

# hello/views.pyfrom django.views.generic import TemplateView

class HelloView(TemplateView): template_name = "hello.html"

def get_context_data(self, **kwargs): return { 'greeted': 'world', }

URLconf, ahoy!

# hello/urls.pyfrom django.conf.urls.defaults import *

from hello.views import HelloView

urlpatterns = patterns('', (r'^hello/', HelloView.as_view()),)

as_view args, yeah!

# hello/urls.pyfrom django.conf.urls.defaults import *

from hello.views import HelloView

# as_view args passed to HelloView.__init__()urlpatterns = patterns('', (r'^hello/', HelloView.as_view( template_name="ciao.html" )),)

Other well-knowns

ListView, DetailView, RedirectView

ArchiveIndexView, YearArchiveView, MonthArchiveView, WeekArchiveView, DayArchiveView, TodayArchiveView, DateDetailView

FormView, CreateView, UpdateView, DeleteView

Logging

Yup, good ol‘ logging

import logging

logging.info("Yay!")

Okay, there is more…

LOGGING setting to configure logging filters and handler, e.g. database handlers

Built-in loggers django, django.request, django.db.backends

Built-in handler AdminEmailHandler, sending to adresses in the ADMINS setting

Static files

The notorious life of the MEDIA_* settings

“media” – files uploaded/generated by users, e.g. via FileField and ImageField

“static” – static assets that are part of your site, e.g. Stylesheets, Images, JavaScript

django.contrib.staticfilescollects static files from multiplelocations into a central location

STATIC_ROOT = "/var/www/static/"STATIC_URL = "/static/"

Using staticfiles in development

Add 'django.contrib.staticfiles' to INSTALLED_APPS

Put static files in <app>/static

Add additional paths (e.g. “project files”) to STATICFILES_DIRS setting (optional)

Deployment

Use collectstatic management command to collect all files in one location

Uses standard storage API, able to deploy to S3 and other cloud storages*

Or, use your own deployment tool with STATIC_ROOT

Caching

Multiple backends# settings.pyCACHES = { 'default': { 'BACKEND': 'django.core.cache.backends.db.DatabaseCache', 'LOCATION': 'my_cache_table', }, 'redis': { 'BACKEND': 'my_cache.backends.RedisCache', 'LOCATION': '127.0.0.1:6379', 'DATABASE': 11, }}

# hello/whatever.pyfrom django.core.cache import get_cache

redis = get_cache('redis')

print redis.get('greeting')

MOAR features!Versions

cache.set('greeting', 'world', version=2)

Prefixes

KEY_PREFIX = 'dutch-edition'

Key transformations

def minor_version_key(key, key_prefix, version): if key == "frontpage": version = "%s.%s" % (version, settings.MINOR_VERSION) return ':'.join( [key_prefix, version, str(key)])

Internationalization

Contexts, finally!# hello/views.pyfrom django.utils.translation import \

pgettext_lazy

month = pgettext_lazy("month name", "May")

# hello/locale/de/LC_MESSAGES/django.pomsgctxt "month name"msgid "May"msgstr "Mai"

Leave a comment# hello/views.pyfrom django.utils.translation import \ ugettext_lazy

class HelloView(TemplateView): template_name = "hello.html"

def get_context_data(self, **kwargs): # Translators: The people you greet greeted = ugettext_lazy("world") return { 'greeted': greeted, }

Leave a comment# hello/templates/base.html{% comment %}Translators: Remember to translate this correctly, dammit!{% endcomment %}{% blocktrans %} Hello, world!{% endblocktrans %}

# hello/locale/de/LC_MESSAGES/django.po#. TRANSLATORS: Remember to translate this correctly, dammit!msgid "Hello, world!"msgstr "Hallo Welt!"

More information

1.3 release notes http://django.me/releases-1.3

Questions?

@jezdez