Django at the Disco

Django at the Disco An introduction to the Django Web framework and how it's used by the Discovery Creative team Rich Leland Discovery Creative @richleland richard_leland@discovery.com http://creative.discovery.com

What is ? • Python Web framework • Originally developed for The World Company • Named after jazz guitarist Django Reinhardt • Released under BSD license in 2005

Who’s using it? • NASA • PBS • Discovery • National Geographic • The New York Times • Broadway • WNYC • Google • LA Times • LexisNexis

Example project structure myproject __init__.py manage.py settings.py urls.py myapp __init__.py admin.py models.py urls.py views.py static templates myproject

Key Features • Object-relational mapper • Automatic admin interface • Elegant, Regex-based URL design • Template language • Cache system • Internationalization • Community

Object-relational mapper from django.db import models class Network(models.Model): """ Represents a member of our family of Networks. """ visible = models.BooleanField(default=True) name = models.CharField(max_length=100) slug = models.SlugField(unique=True) large_logo = models.ImageField(upload_to='ugc/logos/lg/', blank=True) small_logo = models.ImageField(upload_to='ugc/logos/sm/', blank=True) link = models.URLField(verify_exists=False, blank=True) ... # in another file, e.g. views.py: from myapp.models import Network Network.objects.all() Network.objects.get(pk=5) Network.objects.filter(slug=”some-network”)

Automatic admin interface class NetworkAdmin(admin.ModelAdmin): list_display = ('name', 'admin_logo', 'link', 'visible') list_filter = ('visible',) search_fields = ('name',) prepopulated_fields = { 'slug': ('name',) } admin.site.register(Network, NetworkAdmin)

Elegant, RegEx-based URL design from django.conf.urls.defaults import * urlpatterns = patterns('', (r'âdmin/doc/', include('django.contrib.admindocs.urls')), (r'âdmin/(.*)', admin.site.root), # included url confs from other apps (r'âccount/', include('registration.urls')), (r'^bookmarks/', include('bookmarks.urls')), (r'^messages/', include('mailer.urls')), # named url patterns pointing to a view url(r'^downloads/add/(?P<content_type_id>[d]+)/(?P<object_id>[d]+)/$', 'pressweb.media.views.add_download', name='add-download'), url(r'^$', 'pressweb.network.views.region_list', name='select-region-list'), )

URL structure breakdown (r'^admin/doc/', include('django.contrib.admindocs.urls')), RegEx pattern include of another urls.py RegEx pattern url(r'^networks/(?P<object_id>[d]+)/$', view='myapp.views.network_detail', views.py name='add-download'), pattern name

Template system {% extends "base.html" %} {% load i18n %} {% block title %}Bookmarks: {% endblock %} {% block bodyclass %}bookmarks wide{% endblock %} {% block bodyid %}{{ network.slug }}{% endblock %} {% block content %} {% if bookmarks %} <div class="list-view"> {% for bookmark in bookmarks %} <div class="item {% cycle 'odd' 'even' %}"> <div class="column1">{{ bookmark.created|date:"F j, Y" }}</div> <div class="column2">{{ bookmark.title }}</div> <div class="column3"><a href="{{ bookmark.url }}">Go to Page</a></div> </div> {% endfor %} </div> {% endif %} {% endblock %}

Cache system Site-wide cache MIDDLEWARE_CLASSES = ( 'django.middleware.cache.UpdateCacheMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.cache.FetchFromCacheMiddleware', ) Per-view cache @cache_page(60 * 15) def my_view(request): ...

Cache system Template fragment caching {% load cache %} {% cache 500 sidebar %} .. sidebar .. {% endcache %} Low-level cache API from django.core.cache import cache cache.set('my_key', 'hello, world!', 30) cache.get('my_key')

Internationalization i18n in templates {% trans "Bookmarks" %} {% blocktrans %}This object is called {{ obj.name }}{% endblocktrans %} i18n in modules from django.utils.translation import ugettext_lazy as _ class MyThing(models.Model): name = models.CharField(_('name'), help_text=_('This is the help text')) Create message ﬁles (.po), compile them (.mo) django-admin.py makemessages -l pt_BR django-admin.py compilemessages

Contrib Apps • Authentication • Admin • Cache • Comments • CSRF • Email • i18n • Jython support • Serialization • Syndication • GIS (GeoDjango)

Community • Core devs actively involved • Thousands of community-contributed apps • IRC: #django and #django-dev • Mailing lists: django-users and django-developers • Twitter: @djangotracker

Discovery Creative • In-house ad agency for Discovery and family of networks • Established 1996 • 100 strong: design, dev, photo, copy, account services, motion, prepress, production • Web team established 2006 • 2 Django devs • 4 Designers/front-end devs • 2 Project managers • 1 QA manager • Located in Silver Spring & London • Service all networks and business units globally

How we’re using Django • Rapid application development • Combination of B2B, B2C, in-house apps (directory) • Working with partners (Siemens, AFI/Silverdocs) • Saving the company money: 2007: $900k, 2008: $1.5M

Learn more • docs.djangoproject.com • djangobook.com • djangosnippets.org • Practical Django Projects • Djangocon: Sept 8-12 in Portland • django-district.org

Thank you! Rich Leland Discovery Creative @richleland richard_leland@discovery.com http://creative.discovery.com

Django at the Disco

by Rich Leland

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