Django - A whirlwind tour

A quick introduction to Django with tips on deploying to Heroku. Presented at TechCamp Memphis, Fall 2012.

Transcript

1. Django: A Whirlwind Tour Brad Montgomery Email: brad@workforpie.com Twitter: bkmontgomery Friday, November 2, 12
2. Django: Features • Python • ORM: Object-Relational Mapper • MVC-inspired (MVT) • Clean URLs • Huge Community • Worlds Best Documentation Friday, November 2, 12
3. Batteries Included aka: contrib apps • admin • auth • comments • gis • syndication (atom/rss feeds) • sitemaps Friday, November 2, 12
4. https://djangoproject.com/ Friday, November 2, 12
5. Community • 3rd-party, open source apps • django-registration • django-social-auth • django-taggit • django-gravatar2 • django-relationships Friday, November 2, 12
6. http://djangopackages.com/ Friday, November 2, 12
7. So, who’s actually using Django? Friday, November 2, 12
8. Disqus, Instagram, Pintrest, Mozilla, Rdio, Bitbucket, Work for Pie, GiantBomb, The Onion Friday, November 2, 12
9. Projects & Apps • Projects are a collection of applications • Settings • DB Connections • installed apps • Filesystem paths • Command-line tool: manage.py Friday, November 2, 12
10. Projects & Apps $ django-admin.py \ startproject \ sampleproject Friday, November 2, 12
11. Projects & Apps sampleproject/ !"" manage.py #"" sampleproject !"" __init__.py !"" settings.py !"" urls.py #"" wsgi.py Friday, November 2, 12
12. Projects & Apps $ python manage.py \ startapp blog Friday, November 2, 12
13. Projects & Apps sampleproject/ !"" blog !"" __init__.py !"" models.py !"" tests.py #"" views.py Friday, November 2, 12
14. Models from django.db import models from 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 Friday, November 2, 12
15. syncdb $ python manage.py syncdb Friday, November 2, 12
16. Views from django.shortcuts import render_to_response from django.template import RequestContext from 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
17. Views from django.shortcuts import render_to_response from django.template import RequestContext from 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
18. Views from django.shortcuts import render_to_response from django.template import RequestContext from 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
19. Views from django.shortcuts import render_to_response from django.template import RequestContext from 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
20. Views from django.shortcuts import render_to_response from django.template import RequestContext from 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
21. Views from django.shortcuts import render_to_response from django.template import RequestContext from 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
22. 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
23. 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
24. 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
25. 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
26. 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
27. 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
28. 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
29. 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
30. 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
31. 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
32. URL Conf’s • Tie it all together! • Route HTTP requests to views • May also capture values Friday, November 2, 12
33. Root URLConf from django.conf.urls import patterns, include, url from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)), ) sampleproject/sampleproject/urls.py Friday, November 2, 12
34. Root URLConf from django.conf.urls import patterns, include, url from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)), ) sampleproject/sampleproject/urls.py Friday, November 2, 12
35. Root URLConf from django.conf.urls import patterns, include, url from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)), ) sampleproject/sampleproject/urls.py Friday, November 2, 12
36. Root URLConf from django.conf.urls import patterns, include, url from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)), ) sampleproject/sampleproject/urls.py Friday, November 2, 12
37. Root URLConf from django.conf.urls import patterns, include, url from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)), ) sampleproject/sampleproject/urls.py Friday, November 2, 12
38. Root URLConf from django.conf.urls import patterns, include, url from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)), ) sampleproject/sampleproject/urls.py Friday, November 2, 12
39. An HTTP Request Friday, November 2, 12
40. An HTTP Request Friday, November 2, 12
41. An HTTP Request from django.conf.urls import patterns, include, url from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', 'blog.views.display_post', name='display_post'), url(r'^admin/', include(admin.site.urls)), ) sampleproject/sampleproject/urls.py blog/sample-title/ Friday, November 2, 12
42. An HTTP Request from django.conf.urls import patterns, include, url from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', url(r'^blog/(?P<post_slug>.+)/$', '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
43. 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 Friday, November 2, 12
44. 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
45. 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... Friday, November 2, 12
46. 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
47. An HTTP Request Friday, November 2, 12
48. Friday, November 2, 12
49. A Typical Stack Linux Friday, November 2, 12
50. A Typical Stack Linux PostgreSQL Friday, November 2, 12
51. A Typical Stack Linux PostgreSQL Gunicorn + Django Friday, November 2, 12
52. A Typical Stack Linux PostgreSQL Gunicorn + Django nginx Friday, November 2, 12
53. A Typical Stack Linux PostgreSQL Gunicorn + Django nginx Varnish Redis RabbitMQ Memcached Friday, November 2, 12
54. Friday, November 2, 12
55. Enter: Heroku • Deploy & Scale in the Cloud • Provides on-demand App/DB servers • The Heroku Toolbelt • http://www.heroku.com/ Friday, November 2, 12
56. Deploying to Heroku $ heroku create Creating app-name... done, stack is cedar http://app-name.herokuapp.com/ | git@heroku.com:app-name.git Git remote heroku added Do a little bit of setup... Friday, November 2, 12
57. Deploying to Heroku $ git push heroku master ... lots of output ... Friday, November 2, 12
58. Deploying to Heroku $ heroku run python manage.py syncdb ... your typical syncdb output ... Friday, November 2, 12
59. Deploying to Heroku $ git push heroku master Develop locally, then when you want to deploy, just run: Friday, November 2, 12
60. 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/ Friday, November 2, 12
61. Q.E.D. Friday, November 2, 12