Introduction to Django

1. Django Webmardi - 03.04.2012 @brutasse
2. $ whoami
3. “Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design”
6. Théorie
7. Real-world app: Cheese catalog Like / dislike cheeses Twitter authentication
8. $ pip install Django http://www.pip-installer.org
9. $ django-admin.py startproject webmardi webmardi/ ├── manage.py └── webmardi ├── __init__.py ├── settings.py ├── urls.py └── wsgi.py
10. manage.py Project toolbox
11. $ python manage.py startpapp cheese cheese/ ├── __init__.py ├── models.py ├── tests.py └── views.py
12. Models ORM
13. from django.db import models from ..users.models import User class Cheese(models.Model): name = models.CharField(max_length=255) image = models.ImageField(upload_to='cheese') description = models.TextField() class Taste(models.Model): cheese = models.ForeignKey(Cheese, related_name='tastes') user = models.ForeignKey(User) like = models.BooleanField(default=True) class Meta: unique_together = ('cheese', 'user')
14. Admin Customizable edition interface
15. from django.contrib import admin from .models import Cheese, Taste class CheeseAdmin(admin.ModelAdmin): list_display = ('name', 'image') class TasteAdmin(admin.ModelAdmin): list_display = ('cheese', 'user', 'like') admin.site.register(Cheese, CheeseAdmin) admin.site.register(Taste, TasteAdmin)
16. Views Request handling
17. from django.template.response import TemplateResponse from .models import Cheese, Taste def cheese_list(request): context = { 'cheeses': Cheese.objects.all(), } return TemplateResponse(request, 'cheese_list.html', context)
18. URLs HTTP routing
19. from django.conf.urls import patterns, url from . import views urlpatterns = patterns('', url(r'^$', views.cheese_list, name='cheese_list'), url(r'^cheese/(?P<pk>\d+)/$', views.cheese_detail, name='cheese_detail'), url(r'^cheese/(?P<pk>\d+)/like/$', views.like_cheese, name='like_cheese'), url(r'^cheese/(?P<pk>\d+)/dislike/$', views.dislike_cheese, name='dislike_cheese'), url(r'^cheese/add/$', views.add_cheese, name='add_cheese'), )
20. Templates
21. <!-- base.html --> <html> <head> <title>{% block title %}{% endblock %}</title> </head> <body> {% block content %}{% endblock %} </body> </html>
22. <!-- cheese_list.html --> {% extends "base.html" %} {% load thumbnail markup %} {% block title %}Cheese types{% endblock %} {% block content %} {% for cheese in cheeses %} <h2>{{ cheese.name }}</h2> <img src="{% thumbnail cheese.image 300x300 crop %}"> {{ cheese.description|markdown }} {% endfor %} {% endblock %}
23. Tests Untested code is by definition broken
24. from django.core.urlresolvers import reverse from django.test import TestCase class CheeseTest(TestCase): def test_home(self): url = reverse('cheese_list') response = self.client.get(url) self.assertContains(response, 'Cheese')
25. Forms Input validation / sanitization <form> rendering
26. from django import forms from .models import Cheese class CheeseForm(forms.ModelForm): class Meta: model = Cheese
27. GIS Cryptographic signing Browser testing i18n Flash messages Atom/RSS Email Cache Storage Logging Unicode Comments
28. Search Error reporting HTML5 forms Database migrations CMS REST API Background tasks Debugging There's an app for that
29. Questions‽ Thanks @liip Code: https://github.com/brutasse/webmardi Slides: http://speakerdeck.com/u/brutasse