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Django
Webmardi - 03.04.2012
@brutasse
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$ whoami
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“Django is a high-level Python Web framework
that encourages rapid development and
clean, pragmatic design”
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No content
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No content
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Théorie
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Real-world app: Cheese catalog
Like / dislike cheeses
Twitter authentication
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$ pip install Django
http://www.pip-installer.org
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$ django-admin.py startproject webmardi
webmardi/
├── manage.py
└── webmardi
├── __init__.py
├── settings.py
├── urls.py
└── wsgi.py
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manage.py
Project toolbox
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$ python manage.py startpapp cheese
cheese/
├── __init__.py
├── models.py
├── tests.py
└── views.py
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Models
ORM
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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')
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Admin
Customizable edition interface
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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)
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Views
Request handling
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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)
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URLs
HTTP routing
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from django.conf.urls import patterns, url
from . import views
urlpatterns = patterns('',
url(r'^$', views.cheese_list, name='cheese_list'),
url(r'^cheese/(?P\d+)/$',
views.cheese_detail, name='cheese_detail'),
url(r'^cheese/(?P\d+)/like/$',
views.like_cheese, name='like_cheese'),
url(r'^cheese/(?P\d+)/dislike/$',
views.dislike_cheese, name='dislike_cheese'),
url(r'^cheese/add/$', views.add_cheese, name='add_cheese'),
)
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Templates
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{% block title %}{% endblock %}
{% block content %}{% endblock %}
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{% extends "base.html" %}
{% load thumbnail markup %}
{% block title %}Cheese types{% endblock %}
{% block content %}
{% for cheese in cheeses %}
{{ cheese.description|markdown }}
{% endfor %}
{% endblock %}
{{ cheese.name }}
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Tests
Untested code is by definition broken
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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')
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Forms
Input validation / sanitization
rendering
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from django import forms
from .models import Cheese
class CheeseForm(forms.ModelForm):
class Meta:
model = Cheese
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GIS
Cryptographic signing
Browser testing
i18n
Flash messages
Atom/RSS
Email
Cache
Storage
Logging
Unicode
Comments
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Search
Error reporting
HTML5 forms
Database migrations
CMS
REST API
Background tasks
Debugging
There's an app for that
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Questions‽
Thanks @liip
Code: https://github.com/brutasse/webmardi
Slides: http://speakerdeck.com/u/brutasse