What’s New in Django 1.6

Sivasubramaniam Arunachalam

Nov 14, 2013

@sivaa_in

http://www.meetup.com/Bangalore-Django-User-Group/events/149839872/

Malcolm

Tredinnick

(We miss you)

Version Released Date Released After

0.9 Nov 16, 2005

0.91 Jan 11, 2006 2 Months

0.95 Jul 29, 2006 6 Months

0.96 Mar 23, 2007 8 Months

1.0 Sep 03, 2008 17 Months

1.1 Jul 29, 2009 11 Months

1.2 May 17, 2010 9 Months

1.3 Mar 23, 2011 10 Months

1.4 Mar 23, 2012 12 Months

1.5 Feb 26, 2013 11 Months

1.6 Nov 06, 2013 8 Months

Django Version Supported Python

Version (2.x) Supported Python

Version (3.x)

1.0 2.3+

1.1 2.3+

1.2 2.4+

1.3 2.4+

1.4 2.5+

1.5 2.6+ 3.2+*

1.6 2.6+ 3.2+

1.7 2.7+ 3.2+

* Experimental

Python 3 Officially Supported

(Enjoy it in Production)

LTS Releases

https://docs.djangoproject.com/en/dev/internals/release-process/#long-term-support-lts-releases

Django 1.4 till March 2015

New Features

• Simple Layout

• Improved Transactions

• Persistent DB Connections

• Others

New Features

• Simple Layout

• Improved Transactions

• Persistent DB Connections

• Others

Much Simpler (Project & App Layouts)

Application - added admin

- removed sites

Middleware - added clickjacking prevention

Database - SQLite3

New Defaults

Custom Templates (For Projects & Applications)

https://docs.djangoproject.com/en/1.6/ref/django-admin/#custom-app-and-project-templates

startproject

• manage.py

• settings.py

• wsgi.py

• urls.py

startproject

• manage.py

• settings.py

• wsgi.py

• urls.py

Removed Settings

• ADMINS

• MANAGERS

startproject - settings.py

• STATIC_ROOT

• STATICFILES_DIRS

• STATICFILES_FINDERS

• TEMPLATE_DIRS

• TEMPLATE_LOADERS

• MEDIA_ROOT

• MEDIA_URL

• SITE_ID

• LOGGING

Modified Settings

startproject - settings.py

DATABASES (default to SQLite3)

startproject - settings.py - Modified

TIME_ZONE (default to UTC)

startproject - settings.py - Modified

INSTALLED_APPS (admin enabled & sites removed by default)

startproject - settings.py - Modified

MIDDLEWARE_CLASSES (clickjacking protection is enabled by default)

startproject - settings.py - Modified

New Settings

BASE_DIR

startproject - settings.py

startproject

• manage.py

• settings.py

• wsgi.py

• urls.py

admin enabled by default

startproject - urls.py

startapp

• admin.py

• models.py

• views.py

• tests.py

startapp

• admin.py

• models.py

• views.py

• tests.py

admin.py is generated by default

startapp - admin.py

startapp

• admin.py

• models.py

• views.py

• tests.py

Default Example TestCase is removed

startapp - tests.py

File

Django 1.5

Django 1.6

Change

Tar ball 8 M 6.6 M -17.5 %

settings.py 5.3 K 2.0 K -63.1 %

urls.py 556 297 -46.5 %

wsgi.py 1.4 K 387 -72.2 %

tests.py 383 60 -84.3 %

New Features

• Simple Layout

• Improved Transactions

• Persistent DB Connections

• Others

Improved Transactions (Biggest Change from 0.9x)

Old APIs were Deprecated

Transactions

New APIs were Introduced

Transactions

Transactions – New APIs

• Clean & Simple

• Improved Performance

• Improved Error Handling

• Fine grained rollbacks between savepoints

Improvements

Transactions – New APIs

• Enabled by default • Every single SQL Statement is committed immediately

• django.db.transaction.set_autocommit()

DB Level Auto Commit

Transactions – New APIs

atomic() • New Single API to control DB transactions

• Commit on Success

• Rollback on Exceptions

• It can be

• Nested

• Used as a Decorator & Context Manager

Transactions – New APIs – atomic()

Decorator

Transactions – New APIs – atomic()

Context Manager

Transactions

Backward Incompatible

https://docs.djangoproject.com/en/1.6/topics/db/transactions/

#transactions-upgrading-from-1-5

Transactions

Excellent Presentations by

Aymeric Augustin

https://myks.org/en/talks/

More Details

New Features

• Simple Layout

• Improved Transactions

• Persistent DB Connections

• Others

New Connection for every HTTP Request

Till Django 1.5

Persistent DB Connections

Same Connection will be reused between requests

In Django 1.6

Persistent DB Connections

• Life Time of a Database Connection

• Different for each Database

• Default = 0 (Off & No reuse)

• For Unlimited, use None

• Comply with DB Idle Connection Settings

CONN_MAX_AGE

Persistent DB Connections

• Connection is established during the first query

• Connection won’t be closed and reused for subsequent requests

• One Connection for each Worker Thread

• Once it is exceeds the CONN_MAX_AGE, it will be closed • Beginning & end of each request

Processing Behavior

Persistent DB Connections

New Features

• Simple Layout

• Improved Transactions

• Persistent DB Connections

• Others

Locates tests anywhere (test*.py)

New Test Runner

QuerySet.dates() is now Time Zone Aware

(Earlier Only in UTC)

QuerySet.dates() is now operates only on DateField() and returns datetime.date

"hour", "minute" or "second“ lookups are supported

QuerySet.datetimes() is operates on DateTimeField()

and returns datetime.datetime

BinaryField() is introduced

• Stores raw binary data in bytes

• Queryset is not possible

• Don’t use it to store static files

django-admin.py check • Verifies the setup for Current Version

• Settings

• Application Code

• Warnings will be issued for incompatibles

Efficient Model.save()

Before

SELECT is used to determine INSERT (or) UPDATE

Now

if instance has Primary Key, it is UPDATE

else, it is INSERT

Model.objects.earliest()

(latest() with reverse direction)

Model.objects.first()

• Returns the first object from QuerySet

• If no order specified, Ordered by PK

• None for EmptyQuerySet

Model.objects.first()

Model.objects.last()

Model.objects.filter(timestamp__hour = 23)

Model.objects.filter(timestamp__minute = 59)

Model.objects.filter(timestamp__second = 59)

ModelAdmin.preserve_filters

HTML 5 Types for input fields

(Email, URL and Number)

Supported in • IntegerField

• FloatField

• DecimalField

• EmailField

• URLField

Blank Password is Supported

• SQLite Save Points is supported

• Open Layer based GeoDjango Forms API

• Pillow is preferred over PIL for ImageField

• Django Admin jQuery is upgraded from 1.4.2 to 1.9.1

• New Deployment Check List (https://docs.djangoproject.com/en/1.6/howto/deployment/checklist/)

Notable Changes

• UNUSABLE_PASSWORD is removed (is_password_usable)

• MAXIMUM_PASSWORD_LENGTH is removed in the latest security fix

• Password reset now uses Base64 Encoding (earlier it was base36)

• BooleanField is not default to False (None). Be Explicit

• django.db.models.query.EmptyQuerySet can’t be instantiated

• django-debug-toolbar is breaking

Dropped Features

django.contrib.localflavor

django.contrib.databrowse

django.contrib.markup

Deprecated Features

• django.middleware.transaction.TransactionMiddleware

• django.db.transaction.autocommit

• django.db.transaction.commit_on_success

• django.db.transaction.commit_manually

• TRANSACTIONS_MANAGED (in settings.py)

• CACHE_MIDDLEWARE_ANONYMOUS_ONLY

• SEND_BROKEN_LINK_EMAILS (django.middleware.common.BrokenLinkEmailsMiddleware)

django.contrib.comments

Django 1.7

In built migrations

Thank You! siva@sivaa.in

bit.ly/sivasubramaniam bit.ly/sivaa_in

References https://docs.djangoproject.com/en/dev/releases/1.6/ https://speakerdeck.com/julienphalip/django-1-dot-6-the-best-new-features-and-the-important-changes