django a whirlwind tour
DESCRIPTION
A quick introduction to Django with tips on deploying to Heroku. Presented at TechCamp Memphis, Fall 2012TRANSCRIPT
Django: A Whirlwind Tour
Brad Montgomery
Email: [email protected]: bkmontgomery
Friday, November 2, 12
Django: Features
• Python
• ORM: Object-Relational Mapper
• MVC-inspired (MVT)
• Clean URLs
• Huge Community
• Worlds Best Documentation
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Batteries Includedaka: contrib apps
• admin
• auth
• comments
• gis
• syndication (atom/rss feeds)
• sitemaps
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https://djangoproject.com/
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Community
• 3rd-party, open source apps
• django-registration
• django-social-auth
• django-taggit
• django-gravatar2
• django-relationships
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http://djangopackages.com/
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So, who’s actually using Django?
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Disqus,Instagram,
Pintrest, Mozilla,Rdio, Bitbucket,Work for Pie,GiantBomb,The Onion
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Projects & Apps
• Projects are a collection of applications
• Settings
• DB Connections
• installed apps
• Filesystem paths
• Command-line tool: manage.py
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Projects & Apps
$ django-admin.py \ startproject \ sampleproject
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Projects & Apps
sampleproject/!"" manage.py#"" sampleproject !"" __init__.py !"" settings.py !"" urls.py #"" wsgi.py
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Projects & Apps
$ python manage.py \ startapp blog
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Projects & Apps
sampleproject/!"" blog !"" __init__.py !"" models.py !"" tests.py #"" views.py
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Modelsfrom django.db import modelsfrom django.contrib.auth.models import User
class Post(models.Model): author = models.ForeignKey(User) title = models.CharField(max_length=128) slug = models.SlugField(max_length=128, unique=True) content = models.TextField() published_on = models.DateTimeField(auto_now_add=True)
sampleproject/blog/models.py
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syncdb
$ python manage.py syncdb
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Viewsfrom django.shortcuts import render_to_responsefrom django.template import RequestContextfrom models import Post
def display_post(request, post_slug): post = Post.objects.get(slug=post_slug) template_data = {'post': post} template = "blog/post.html" return render_to_response( template, template_data, context_instance=RequestContext(request) )
sampleproject/blog/views.py
Friday, November 2, 12
Viewsfrom django.shortcuts import render_to_responsefrom django.template import RequestContextfrom models import Post
def display_post(request, post_slug): post = Post.objects.get(slug=post_slug) template_data = {'post': post} template = "blog/post.html" return render_to_response( template, template_data, context_instance=RequestContext(request) )
sampleproject/blog/views.py
Friday, November 2, 12
Viewsfrom django.shortcuts import render_to_responsefrom django.template import RequestContextfrom models import Post
def display_post(request, post_slug): post = Post.objects.get(slug=post_slug) template_data = {'post': post} template = "blog/post.html" return render_to_response( template, template_data, context_instance=RequestContext(request) )
sampleproject/blog/views.py
Friday, November 2, 12
Viewsfrom django.shortcuts import render_to_responsefrom django.template import RequestContextfrom models import Post
def display_post(request, post_slug): post = Post.objects.get(slug=post_slug) template_data = {'post': post} template = "blog/post.html" return render_to_response( template, template_data, context_instance=RequestContext(request) )
sampleproject/blog/views.py
Friday, November 2, 12
Viewsfrom django.shortcuts import render_to_responsefrom django.template import RequestContextfrom models import Post
def display_post(request, post_slug): post = Post.objects.get(slug=post_slug) template_data = {'post': post} template = "blog/post.html" return render_to_response( template, template_data, context_instance=RequestContext(request) )
sampleproject/blog/views.py
Friday, November 2, 12
Viewsfrom django.shortcuts import render_to_responsefrom django.template import RequestContextfrom models import Post
def display_post(request, post_slug): post = Post.objects.get(slug=post_slug) template_data = {'post': post} template = "blog/post.html" return render_to_response( template, template_data, context_instance=RequestContext(request) )
sampleproject/blog/views.py
Friday, November 2, 12
A base template<!DOCTYPE html><html><head> <title> {% block title %}{% endblock %} </title></head>
<body> {% block content %}{% endblock %}</body></html>
sampleproject/sampleproject/templates/base.html
Friday, November 2, 12
A base template<!DOCTYPE html><html><head> <title> {% block title %}{% endblock %} </title></head>
<body> {% block content %}{% endblock %}</body></html>
sampleproject/sampleproject/templates/base.html
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A post template{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
Friday, November 2, 12
A post template{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
Friday, November 2, 12
A post template{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
Friday, November 2, 12
A post template{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
Friday, November 2, 12
A post template{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
Friday, November 2, 12
A post template{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
Friday, November 2, 12
A post template{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
Friday, November 2, 12
A post template{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
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URL Conf’s
• Tie it all together!
• Route HTTP requests to views
• May also capture values
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Root URLConf
from django.conf.urls import patterns, include, url
from django.contrib import adminadmin.autodiscover()
urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)),)
sampleproject/sampleproject/urls.py
Friday, November 2, 12
Root URLConf
from django.conf.urls import patterns, include, url
from django.contrib import adminadmin.autodiscover()
urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)),)
sampleproject/sampleproject/urls.py
Friday, November 2, 12
Root URLConf
from django.conf.urls import patterns, include, url
from django.contrib import adminadmin.autodiscover()
urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)),)
sampleproject/sampleproject/urls.py
Friday, November 2, 12
Root URLConf
from django.conf.urls import patterns, include, url
from django.contrib import adminadmin.autodiscover()
urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)),)
sampleproject/sampleproject/urls.py
Friday, November 2, 12
Root URLConf
from django.conf.urls import patterns, include, url
from django.contrib import adminadmin.autodiscover()
urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)),)
sampleproject/sampleproject/urls.py
Friday, November 2, 12
Root URLConf
from django.conf.urls import patterns, include, url
from django.contrib import adminadmin.autodiscover()
urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)),)
sampleproject/sampleproject/urls.py
Friday, November 2, 12
An HTTP Request
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An HTTP Request
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An HTTP Request
from django.conf.urls import patterns, include, url
from django.contrib import adminadmin.autodiscover()
urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)),)
sampleproject/sampleproject/urls.py
blog/sample-title/
Friday, November 2, 12
An HTTP Request
from django.conf.urls import patterns, include, url
from django.contrib import adminadmin.autodiscover()
urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)),)
sampleproject/sampleproject/urls.py
blog/sample-title/
Friday, November 2, 12
An HTTP Request
def display_post(request, post_slug): post = Post.objects.get(slug=post_slug) template_data = {'post': post} template = "blog/post.html" return render_to_response( template, template_data, context_instance=RequestContext(request) )
sampleproject/blog/views.py
sample-title
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An HTTP Request{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
Sample Title
Friday, November 2, 12
An HTTP Request{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
Lorem Ipsum...
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An HTTP Request{% extends "base.html" %}
{% block title %} {{ post.title }}{% endblock %}
{% block content %} <h1>{{ post.title }}</h1>
{{ post.content|urlize|linebreaks }}
<p>Published on: {{ post.published_on|date:"M d, Y" }}</p>{% endblock %}
sampleproject/blog/templates/blog/post.html
Nov 3, 2012
Friday, November 2, 12
An HTTP Request
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A Typical Stack
Linux
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A Typical Stack
Linux
PostgreSQL
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A Typical Stack
Linux
PostgreSQL
Gunicorn + Django
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A Typical Stack
Linux
PostgreSQL
Gunicorn + Django
nginx
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A Typical Stack
Linux
PostgreSQL
Gunicorn + Django
nginx
Varnish
Redis
RabbitMQ
Memcached
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Enter: Heroku
• Deploy & Scale in the Cloud
• Provides on-demand App/DB servers
• The Heroku Toolbelt
• http://www.heroku.com/
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Deploying to Heroku
$ heroku create
Creating app-name... done, stack is cedarhttp://app-name.herokuapp.com/ | [email protected]:app-name.gitGit remote heroku added
Do a little bit of setup...
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Deploying to Heroku
$ git push heroku master
... lots of output ...
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Deploying to Heroku
$ heroku run python manage.py syncdb
... your typical syncdb output ...
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Deploying to Heroku
$ git push heroku master
Develop locally, then when you want to deploy, just run:
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Want to Learn More?
• Official Django Docs
• https://docs.djangoproject.com
• *Djangobook http://www.djangobook.com
• Find Apps: http://www.djangopackages.com/
• Coming Soon: http://gettingstartedwithdjango.com/
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Q.E.D.
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