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Django tech-talk
- 1. Tech Talk: Django A Brief Overview and Examples Dustin Dannenhauer dtdannen @ indiana.edu March 22nd, 2011
- 4. DRY (Don't Repeat Yourself)
- 5. Originally designed for news websites
- 7. guardian.co.uk (~2.5 million hits a month)
- 10. comicvine.com
- 12. lawrence.com
- 14. Automatic Admin Web Interface
- 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
- 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
- 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...
- 53. Presentation on ”High Performance Django”