Django tech-talk

1. Tech Talk: Django A Brief Overview and Examples Dustin Dannenhauer dtdannen @ indiana.edu March 22nd, 2011

3. Written in Python

4. DRY (Don't Repeat Yourself)

5. Originally designed for news websites

7. guardian.co.uk (~2.5 million hits a month)

8. giantbomb.com

9. newyorktimes.com

10. comicvine.com

11. washingtonpost.com

12. lawrence.com

14. Automatic Admin Web Interface

16. Model-View-Controller architectural pattern (MVC)

18. View = User Interface

19. Controller = Handles Input/Output

21. Instead of writing SQL statements to interact with the database, use objects (classes) in python to interact with relational database

23. Each Python class represents a table in the database, each actual object is a row

24. Python classes defined in file: models.py

25. All fields of a class represent a field in the database

26. You can add your own methods on top to supplement fields

27. Example: models.py from django.db import models class Reporter(models.Model): full_name = models.CharField(max_length=70) class Article(models.Model): pub_date = models.DateTimeField() headline = models.CharField(max_length=200) content = models.TextField() reporter = models.ForeignKey(Reporter)

28. Using classes in models.py >>> Reporter.objects.all() [] # Create a new Reporter. >>> r = Reporter(full_name='John Smith') # Save the object into the database. You have to call save() explicitly. >>> r.save() # Now it has an ID. >>> r.id 1 # Now the new reporter is in the database. >>> Reporter.objects.all() [<Reporter: John Smith>]

30. Code is written in file: views.py

32. Data from the URL can be passed into the view

33. Uses regular expressions to match the URL to what the user tried to go to

35. urlpatterns = patterns('',

36. (r'^articles/({4})$','news.views.year_archive'),

37. (r'^articles/({4})/({2})/$',

38. 'news.views.month_archive'),

40. Example: views.py def year_archive(request, year): a_list = Article.objects.filter(pub_date__year=year) return render_to_response( 'news/year_archive.html', {'year': year, 'article_list': a_list})

42. Variables can be passed into a template

43. Template Inheritance

44. Example Base Template <html> <head> <title>{% block title %}{% endblock %}</title> </head> <body> <img src="sitelogo.gif" alt="Logo" /> {% block content %}{% endblock %} </body> </html>

45. Example Child Template {% extends "base.html" %} {% block title %}Articles for {{ year }}{% endblock %} {% block content %} <h1>Articles for {{ year }}</h1> {% for article in article_list %} <p>{{ article.headline }}</p> <p>By {{ article.reporter.full_name }}</p> <p>Published {{ article.pub_date|date:"F j, Y" }}</p> {% endfor %} {% endblock %}

47. Syndication Framework (RSS and Atom Feeds)

48. Modularity of Django (many little apps)

49. Deployment

50. and much more...

52. http://www.djangobook.com/

53. Presentation on ”High Performance Django”

54. http://www.slideshare.net/zeeg/django-con-high-performance-django-presentation

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