Django Intro

Introduction to Django Master en Software Libre Caixanova May 22nd 2009

whoami ● Portuguese since 1985 ● GTK+ developer ● Proud Pythonista ● Djangonaut since 2007 ● Igalian since 2008 And if you insist... http://www.joaquimrocha.com MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

My Latest Django Project Rancho http://www.getrancho.com MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

What's Django MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

What's Django? quot;Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.quot; From Django official website MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Young But Strong ● Internal project of Lawrence Journal-World in 2003 ● Should help journalists meet fast deadlines ● Should not stand in the journalists' way ● Got its name after the famous guitarrist Django Reinhardt MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

The Framework ● Object-Relational Mapper ● Automatic Admin Interface ● Elegant URL Design ● Powerful Template System ● i18n it's amazing...! MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

MTV Model-Template-View ● Model: What things are ● Templates: How things are presented ● Views: How things are processed MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Deployment ● FastCGI ● mod_python ● mod_wsgi ● ... MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

DB Backend ● PostgreSQL ● MySQL ● SQLite ● Oracle MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Big Community ● Django People: – http://djangopeople.net ● Django Pluggables: – http://djangopluggables.com ● Django Sites: – http://www.djangosites.org ● ... MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Using Django MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Installation Just get a tarball release or checkout the sources: http://www.djangoproject.com/download/ Then: # python setup.py install ... yeah, that it! MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Development Django Projects have applications MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Project $ django-admin.py startproject Project Project/ __init__.py manage.py settings.py urls.py MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Project Does it work? $ ./manage.py runserver MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Project MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Applications Apps are the project's components $ ./manage.py startapp recipe recipe/ __init__.py models.py tests.py views.py MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Configuration settings.py Easy configuration MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Building The Database $ ./manage.py syncdb MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Models models.py, series of classes describing objects Represent the database objects. Never touch SQL again! MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Models class Post(models.Model): title = models.CharField(max_length = 500) content = models.TextField() date = models.DateTimeField(auto_now = True) ... MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Views views.py, series of functions that will normally process some models and render HTML Where the magic happen! How to get all blog posts from the latest 5 days and order them by descending date? MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Views import datetime def view_latest_posts(request): # Last 5 days date = datetime.datetime.now() - datetime.timedelta(5) posts = Post.objects.filter(date__gte = date).order_by('-date') return render_to_response('posts/show_posts.html', {'posts': posts}) MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Template Will let you not repeat yourself! Will save designers from the code. MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Template <html> <head> <title>{% block title %}{% endblock %}</title> </head> <body> {% block content %}{% endblock %} </body> </html> MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Template {% extends quot;base.htmlquot; %} {% block title %}Homepage{% endblock %} {% block content %} <h3>This will be some main content</h3> {% for post in posts %} <h4>{{ post.title }} on {{ post.date|date:quot;B d, Yquot;|upper }}<h4> <p>{{ post.content }}</p> {% endfor %} {% url project.some_app.views.some_view some arguments %} {% endblock %} MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

URLs In Django, URLs are part of the design! MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

URLs urls.py use regular expressions to match URLs with views urlpatterns = patterns('Project.some_app.views', (r'^$', 'index'), (r'^posts/(?P<r_id>d+)/$', 'view_latest_posts'), (r'^create/$', 'create'), ) MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Forms forms.py, series of classes that represent an HTML form Will let you easily configure the expected type of the inputs, error messages, labels, etc... MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Forms class CreatePost(forms.Form): title = forms.CharField(label = quot;Post Titlequot;, max_length = 500, widget = forms.TextInput(attrs={ 'class': 'big_entry' })) content = forms.CharField() tags = forms.CharField(required = False) MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Forms def create_post(request): if request.method == 'POST': form = CreatePost(request.POST) if form.is_valid(): # Create a new post object with data # from form.cleaned_data return HttpResponseRedirect('/index/') else: form = CreatePost() return render_to_response('create.html', { 'form': form, }) MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Forms The quick way... <form action=quot;/create/quot; method=quot;POSTquot;> {{ form.as_p }} <input type=quot;submitquot; value=quot;Createquot; /> </form> MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Performance MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

Performance For those who doubt... http://www.alrond.com/en/2007/jan/25/performance-test-of-6-leading- frameworks/ MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

HELP! MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

HELP! Django Docs http://docs.djangoproject.com Some books ● Learning Website Development with Django, Packt ● Practical Django Projects, Apress ● Pro Django, Apress MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

End Thank you! Questions? MSWL Caixanova · Vigo · May 22nd 2009 | Joaquim Rocha | jrocha@igalia.com

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Django Intro

by Joaquim Rocha on May 24, 2009

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