Introduction to Django 1.0

PyCon PL'08 Marcin Mierzejewski www.mierzejewski.net

Agenda History Features Architecture Example Links

Django Framework to easy and fast develop web application

History 2003 - Kansas, USA 2005 - BSD 2005 -
v0.90 2006 - v0.95 2007 - v0.96 2008 - Fundation, v1.0 7

Features Documentation HTTP Server ORM URL dispatcher Templates

Features Administration Panel Forms Middleware & Signals i18n i L10n
Cache Authentication & Authorization

Architecture MVC (MTV Model Template View) Model - data View
- logic Template - presentation

Architecture Browser Database URL Template Model View

Model Browser Database URL Template Model View

Model SQL Free ORM Relations API

Model class Category(models.Model): name = models.CharField(max_length=200) slug = models.SlugField(unique=True) class
Entry(models.Model): title = models.CharField(max_length=200) slug = models.SlugField(unique=True) body = models.TextField() data = models.DateTimeField(default=datetime.now) categories = models.ManyToManyField(Category)

Model API >>> category = Category(slug='django', name='Django') >>> category.save() >>>
print category.name u'Django' >>> categories = Category.objects.all() >>> categories = Category.objects.filter(slug='django') >>> categories [<Category: Category object>] >>> entry = Entry(slug='welcome', title='Welcome', body='') >>> entry.save() >>> entry.categories.add( category[0] ) >>> print entry.categories.all() [<Category: Category object>]

View Browser Database URL Template Model View

View def entry_list(request): entries = Ebtry.objects.all()[:5] return render_to_response('list.html', {'entries': entries})
def entry_details(request, slug): entry = get_object_or_404(Entry, slug = slug) return render_to_response('details.html', {'entry': entry})

Template Browser Database URL Template Model View

Template {{ variables }}, {% tags %} & filters <html>
<head> <title>My Blog</title> </head> <body> {% for entry in entries %} <h1>{{ entry.title|upper }}</h1> {{ entry.body }}<br/> Published {{ entry.data|date:"d F Y" }}, <a href=”{{ entry.get_absolute_url }}”>link</a>. {% endfor %} </body> </html>

Template Inheritance <html> <head> <title> {% block title %} {%
endblock %} </title> </head> <body> {% block body %} {% endblock %} </body> </html> {% extend “body.html” %} {% block title %} Main page {% endblock %} {% block body %} Content {% endblock %}

URL Browser Database URL Template Model View

URL # http://mypage.org/pycon-pl-08/ (r'^(?P<slug>[-\w]+)/$', 'blog.views.entry_details'), # http://mypage.org/ (r'^$', 'blog.views.entry_list'),

Architecture Browser Database URL Template Model View

Example Entries list Details Administrator Panel Users

Webapp # django-admin.py startproject webapp webapp/ __init__.py manage.py settings.py urls.py
webapp/ __init__.py manage.py settings.py urls.py DATABASE_ENGINE DATABASE_NAME INSTALLED_APPS = ( ... 'django.contrib.admin',) (r'^admin/(.*)', admin.site.root)

Tabels webapp# manage.py syncdb Creating table auth_permission Creating table auth_group
Creating table auth_user Creating table auth_message Creating table django_content_type Creating table django_session Creating table django_site Creating table django_admin_log ......................... webapp# manage.py runserver Validating models... 0 errors found Django version 1.0-final-SVN-unknown, .......... Development server is running at http://127.0.0.1:8000/ Quit the server with CTRL-BREAK.

Panel http://127.0.0.1:8000/admin/

blog webapp# manage.py startapp blog blog/ __init__.py models.py views.py webapp/settings.py:
INSTALLED_APPS = ( ... 'blog',)

models.py class Kategoria(models.Model): nazwa = models.CharField(max_length=200) slug = models.SlugField(unique=True) def
__unicode__(self): return u'%s' % self.nazwa class Wpis(models.Model): tytul = models.CharField(max_length=200) slug = models.SlugField(unique=True) tresc = models.TextField() data = models.DateTimeField(default=datetime.now) kategorie = models.ManyToManyField(Kategoria) def __unicode__(self): return u'%s' % self.tytul webapp/blog/models.py class Category(models.Model): name = models.CharField(max_length=200) slug = models.SlugField(unique=True) admin.site.register(Category) class Entry(models.Model): title = models.CharField(max_length=200) slug = models.SlugField(unique=True) body = models.TextField() data = models.DateTimeField(default=datetime.now) categories = models.ManyToManyField(Category) admin.site.register(Entry)

Panel webapp# manage.py syncdb webapp# manage.py runserver

urls.py webapp/urls.py: (r'^(?P<slug>[-\w]+)/$', 'blog.views.entry_details'), (r'^$', 'blog.views.entry_list'),

views.py def entry_list(request): entries = Entry.objects.all().order_by('-data')[:5] return render_to_response('list.html', {'entries': entries})
def entry_details(request, slug): entry = get_object_or_404(Entry, slug = slug) return render_to_response('details.html', {'entries':entries})

Templates <html> <head><title>My Blog</title></head> <body> {% for entry in entries
%} <h1>{{ entry.title|upper }}</h1> {{ wpis.body }}<br> Published {{ entry.data|date:"d F Y" }}<br/> <a href="/{{ entry.slug }}/">Link</a> {% endfor %} </body> </html> <html> <head><title>{{ entry.title|upper }}</title></head> <body> <h1>{{ entry.title|upper }}</h1> {{ entry.body }}<br> Published {{ entry.data|date:"d F Y" }}<br/> </body> </html>

Done http://127.0.0.1:8000/ http://127.0.0.1:8000/pycon-pl-2008 http://127.0.0.1:8000/

Statistics views.py + models.py + settings.py + urls.py = 26
LoC list.html + details.html = 19 LoC

Linki DjangoProject.com DjangoBook.com DjangoPeople.net DjangoSnipplets.com DjangoGigs.com ...

Thank you

Introduction to Django 1.0

Introduction to Django 1.0

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