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Django for Beginners

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Jason Davies

Slides for the "Django for Beginners" tutorial given at PyConUK 2007 by Jason Davies

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An Introduction ,[object Object],[object Object]
Django Reinhardt
ljworld.com
 
www.djangoproject.com
 
 
 
Overview of this Tutorial ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Django's Mission Statement ,[object Object]
Django Requirements ,[object Object],[object Object],[object Object]
“Projects” $ django-admin.py startproject myproject
myproject/ __init__.py manage.py settings.py urls.py
$ ./manage.py runserver Validating models... 0 errors found. Django version 0.96-pre, using settings 'myproject.settings' Development server is running at http://127.0.0.1:8000/ Quit the server with CONTROL-C.
 
“Apps” $ django-admin.py startapp blog
myproject/ blog/ __init__.py models.py views.py __init__.py manage.py settings.py urls.py
Creating Models from django.db import models class Blog(models.Model): title = models.CharField(maxlength=200) class Post(models.Model): title = models.CharField(maxlength=200) body = models.TextField() blog = models.ForeignKey(Blog) pub_date = models.DateTimeField()
Activating Models $ ./manage.py syncdb Creating table blog_blog Creating table blog_post Loading 'initial_data' fixtures... No fixtures found.
Activating the Admin Interface from django.db import models class Blog(models.Model): title = models.CharField(maxlength=200) class Admin: list_display = ['title'] class Post(models.Model): title = models.CharField(maxlength=200) body = models.TextField() blog = models.ForeignKey(Blog) pub_date = models.DateTimeField() class Admin: list_display = ['title', 'pub_date']
 
 
Model API $ ./manage.py shell >>> from myproject.blog import Blog >>> b = Blog( ... title=”Jason's Fantastic Blog!!!”) >>> b.save()
>>> all_blogs = Blog.objects.all() >>> print all_blogs [<Blog: Blog object>] >>> print all_blogs.name Jason's Fantastic Blog!!! >>> b = Blog.objects.get(name__contains='Jason') >>> print b.title Jason's Fantastic Blog!!!
URLs ROOT_URLCONF = 'myproject.urls'
URLconfs from django.conf.urls.defaults import * from myproject.blog.views import * urlpatterns = patterns('', (r'^admin/', include('django.contrib.admin.urls')), (r'^blog/$', post_list), (r'^blog/(?P<id>+)/$', post_list), )
Views from django.http import HttpResponse def post_list(request): return HttpReponse(“This is a list of posts!”)
from django.http import HttpResponse from myproject.blog.models import Post def post_list(request): r = “<ul>” posts = Post.objects.order_by(“-pub_date”) for post in posts: r += “<li>%s: %s</li>” % (post.title, post.body) r += “</ul>” return HttpResponse(r) More realistic...
from django.shorcuts import render_to_response from myproject.blog.models import Post def post_list(request): posts = Post.objects.order_by(“-pub_date”) return render_to_response('blog/post_list.html', { 'post_list': posts, }) Better!
from django.shorcuts import render_to_response from myproject.blog.models import Post def post_detail(request, id): post = get_object_or_404(Post, id=id) return render_to_response('blog/post_detail.html', { 'post': post, }) For completeness...
Templates <html> <body> <h1>Jason's Fantastic Blog!!!</h1> <ul> {% for p in post_list %} <li> <a href=”{{ p.id }}/”>{{ p.title|escape }}</a> </li> {% endfor %} </ul> </body> </html>
The magic dot ,[object Object],[object Object],[object Object]
Filters {{ var|escape|linebreaks|... }}
base.html <html> <head> <title>{% block title %}{% endblock %} </head> <body> <div id=”content”> {% block content %}{% endblock %} </div> <div id=”footer”> {% block footer %} Copyright Jason Davies 2007. {% endblock %} </div> </body> </html>
{% extends “base.html” %} {% block title %} Posts | {{ block.super }} {% endblock %} {% block content %} <h1>Blog Posts ({{ post_list|length }} total)</h1> <ul> {% for post in post_list %} <li> <a href=”{{ post.id }}/”> {{ post.title|escape }} </a> </li> {% endfor %} </ul> {% endblock %}
Ruby on Rails http://www.rubyonrails.org/
http://www.alrond.com/en/2007/jan/25/performance-test-of-6-leading-frameworks/
Thank you for listening. Jason Davies [email_address] http://www.jasondavies.com/
http://www.mercurytide.co.uk/whitepapers/django-cheat-sheet/
 
 

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Django for Beginners

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  • 12. “Projects” $ django-admin.py startproject myproject
  • 13. myproject/ __init__.py manage.py settings.py urls.py
  • 14. $ ./manage.py runserver Validating models... 0 errors found. Django version 0.96-pre, using settings 'myproject.settings' Development server is running at http://127.0.0.1:8000/ Quit the server with CONTROL-C.
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  • 17. myproject/ blog/ __init__.py models.py views.py __init__.py manage.py settings.py urls.py
  • 18. Creating Models from django.db import models class Blog(models.Model): title = models.CharField(maxlength=200) class Post(models.Model): title = models.CharField(maxlength=200) body = models.TextField() blog = models.ForeignKey(Blog) pub_date = models.DateTimeField()
  • 19. Activating Models $ ./manage.py syncdb Creating table blog_blog Creating table blog_post Loading 'initial_data' fixtures... No fixtures found.
  • 20. Activating the Admin Interface from django.db import models class Blog(models.Model): title = models.CharField(maxlength=200) class Admin: list_display = ['title'] class Post(models.Model): title = models.CharField(maxlength=200) body = models.TextField() blog = models.ForeignKey(Blog) pub_date = models.DateTimeField() class Admin: list_display = ['title', 'pub_date']
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  • 23. Model API $ ./manage.py shell >>> from myproject.blog import Blog >>> b = Blog( ... title=”Jason's Fantastic Blog!!!”) >>> b.save()
  • 24. >>> all_blogs = Blog.objects.all() >>> print all_blogs [<Blog: Blog object>] >>> print all_blogs.name Jason's Fantastic Blog!!! >>> b = Blog.objects.get(name__contains='Jason') >>> print b.title Jason's Fantastic Blog!!!
  • 25. URLs ROOT_URLCONF = 'myproject.urls'
  • 26. URLconfs from django.conf.urls.defaults import * from myproject.blog.views import * urlpatterns = patterns('', (r'^admin/', include('django.contrib.admin.urls')), (r'^blog/$', post_list), (r'^blog/(?P<id>+)/$', post_list), )
  • 27. Views from django.http import HttpResponse def post_list(request): return HttpReponse(“This is a list of posts!”)
  • 28. from django.http import HttpResponse from myproject.blog.models import Post def post_list(request): r = “<ul>” posts = Post.objects.order_by(“-pub_date”) for post in posts: r += “<li>%s: %s</li>” % (post.title, post.body) r += “</ul>” return HttpResponse(r) More realistic...
  • 29. from django.shorcuts import render_to_response from myproject.blog.models import Post def post_list(request): posts = Post.objects.order_by(“-pub_date”) return render_to_response('blog/post_list.html', { 'post_list': posts, }) Better!
  • 30. from django.shorcuts import render_to_response from myproject.blog.models import Post def post_detail(request, id): post = get_object_or_404(Post, id=id) return render_to_response('blog/post_detail.html', { 'post': post, }) For completeness...
  • 31. Templates <html> <body> <h1>Jason's Fantastic Blog!!!</h1> <ul> {% for p in post_list %} <li> <a href=”{{ p.id }}/”>{{ p.title|escape }}</a> </li> {% endfor %} </ul> </body> </html>
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  • 34. base.html <html> <head> <title>{% block title %}{% endblock %} </head> <body> <div id=”content”> {% block content %}{% endblock %} </div> <div id=”footer”> {% block footer %} Copyright Jason Davies 2007. {% endblock %} </div> </body> </html>
  • 35. {% extends “base.html” %} {% block title %} Posts | {{ block.super }} {% endblock %} {% block content %} <h1>Blog Posts ({{ post_list|length }} total)</h1> <ul> {% for post in post_list %} <li> <a href=”{{ post.id }}/”> {{ post.title|escape }} </a> </li> {% endfor %} </ul> {% endblock %}
  • 36. Ruby on Rails http://www.rubyonrails.org/
  • 38. Thank you for listening. Jason Davies [email_address] http://www.jasondavies.com/
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Editor's Notes

  1. Hello! My name is Jason Davies; I&apos;m a freelance Web developer from Cambridge and I&apos;ve been using Django for about 2 years ever since it was open-sourced in July 2005. Hopefully this will give you a good introduction to the basics of Django. Simon Willison will cover even more stuff in the advanced tutorial.