Download as KEY, PPTX
![Deep Dive: Models
from tagging.fields import TagField
class Post(models.Model):
author = models.ForeignKey(Author)
title = models.CharField(max_length=200)
slug = models.SlugField(max_length=200, unique_for_month='pub_date')
body = models.TextField()
TYPE_CHOICES = (
('rant', 'Rant'),
('tirade', 'Tirade'),
)
type = models.CharField(choices=TYPE_CHOICES, max_length=50)
pub_date = models.DateTimeField(auto_now_add=True)
is_active = models.BooleanField(default=True)
tags = TagField(blank=True, null=True)
class Meta:
unique_together = ('title', 'type')
ordering = ['-pub_date']](https://image.slidesharecdn.com/jumpstartdjango2-091102211754-phpapp01/85/Jumpstart-Django-31-320.jpg)
![Deep Dive: DB API
post = Post(title=‘Foo’, body=‘Bar’)
post.type = ‘rant’
post.save()
posts = Post.objects.all()
posts = Post.objects.all()[:5]
posts = Post.objects.filter(post_type=‘rant’)
posts = Post.objects.filter(author__name=‘Rob’)
posts = Post.objects.filter(author__name=‘Rob’).
filter(title__contains=‘django’).order_by(‘type’)
post = Post.objects.get(id=24)](https://image.slidesharecdn.com/jumpstartdjango2-091102211754-phpapp01/85/Jumpstart-Django-34-320.jpg)
![Deep Dive: URLs
urlpatters = patterns(‘’,
(’^my/favorite/color/$’, ‘blog.views.my_fav_color’),
(‘^post/new/$’, ‘blog.views.new_post’),
(‘^posts/(d{4})/$’, ‘blog.views.year_archive’),
(‘^posts/(d{4})/(d{2})/$’, ‘blog.views.month_archive’),
(‘^posts/(?P<slug>[a-z-]*)/$’, ‘blog.views.show_post’),
(‘^events/$’, include(events.urls),
)](https://image.slidesharecdn.com/jumpstartdjango2-091102211754-phpapp01/85/Jumpstart-Django-41-320.jpg)
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Jumpstart Django
- 1. Jumpstart The Web Framework for Perfectionists with Deadlines CPOSC Rob Yates October, 2009
- 2.
- 3. Topics • What isDjango
- 4. Topics • What isDjango • History of Django
- 5. Topics • What isDjango • History of Django • Whirlwind Tour
- 6. Topics • What isDjango • History of Django • Whirlwind Tour • How to Get Started - Admin Demo
- 7. Topics • What isDjango • History of Django • Whirlwind Tour • How to Get Started - Admin Demo • Killer Features
- 8. Topics • What isDjango • History of Django • Whirlwind Tour • How to Get Started - Admin Demo • Killer Features • Application Re-use and Pinax
- 9. Topics • What isDjango • History of Django • Whirlwind Tour • How to Get Started - Admin Demo • Killer Features • Application Re-use and Pinax • Framework Death-match
- 10.
- 11. What is Django? • Not a Gypsy Jazz Guitarist
- 12. What is Django? • Not a Gypsy Jazz Guitarist • Web Application Development Framework written in and for Python
- 13. What is Django? • Not a Gypsy Jazz Guitarist • Web Application Development Framework written in and for Python • Not a CMS System
- 14. What is Django? • Not a Gypsy Jazz Guitarist • Web Application Development Framework written in and for Python • Not a CMS System • Sometimes called Python’s Ruby on Rails (RoR)
- 15. It all started HERE Photo by Jeff Croft
- 16.
- 18. PyCon 2005 Major topic:Why is web development in Python so hard?
- 19. Jump to today: GuidingPrinciples
- 20. Jump to today: Guiding Principles • Loose Coupling and tight cohesion
- 21. Jump to today: Guiding Principles • Loose Coupling and tight cohesion • Less code
- 22. Jump to today: Guiding Principles • Loose Coupling and tight cohesion • Less code • Quick development
- 23. Jump to today: Guiding Principles • Loose Coupling and tight cohesion • Less code • Quick development • DRY
- 24. Jump to today: Guiding Principles • Loose Coupling and tight cohesion • Less code • Quick development • DRY • Explicit is better than implicit
- 25. Jump to today: Guiding Principles • Loose Coupling and tight cohesion • Less code • Quick development • DRY • Explicit is better than implicit • Consistency
- 26. For Free!!! • Very Useful Admin CRUD • Templating - lots of useful rendering bits • Form Handling • i18n - full Unicode support • Sessions / User Auth / Role-based Perms • Object-Relational Mapping Beer photo by Lori Spindler
- 27.
- 28. Model View Controller Model View Template
- 29. Models Templates App Views Models Templates App Views Site Models Templates App Views Settings URLs Django App Structure Templates
- 30. Architecture RDBMS Storage ORM Fixtures Model Signals Forms Template URL Resolver View Template Loader Middleware Middleware Request Response
- 31. Deep Dive: Models fromtagging.fields import TagField class Post(models.Model): author = models.ForeignKey(Author) title = models.CharField(max_length=200) slug = models.SlugField(max_length=200, unique_for_month='pub_date') body = models.TextField() TYPE_CHOICES = ( ('rant', 'Rant'), ('tirade', 'Tirade'), ) type = models.CharField(choices=TYPE_CHOICES, max_length=50) pub_date = models.DateTimeField(auto_now_add=True) is_active = models.BooleanField(default=True) tags = TagField(blank=True, null=True) class Meta: unique_together = ('title', 'type') ordering = ['-pub_date']
- 32. Architecture RDBMS Storage ORM Fixtures Model Signals Forms Template URL Resolver View Template Loader Middleware Middleware Request Response
- 33. Deep Dive: DBAPI post = Post(title=‘Foo’, body=‘Bar’) post.type = ‘rant’ post.save()
- 34. Deep Dive: DBAPI post = Post(title=‘Foo’, body=‘Bar’) post.type = ‘rant’ post.save() posts = Post.objects.all() posts = Post.objects.all()[:5] posts = Post.objects.filter(post_type=‘rant’) posts = Post.objects.filter(author__name=‘Rob’) posts = Post.objects.filter(author__name=‘Rob’). filter(title__contains=‘django’).order_by(‘type’) post = Post.objects.get(id=24)
- 35. Architecture RDBMS Storage ORM Fixtures Model Signals Forms Template URL Resolver View Template Loader Middleware Middleware Request Response
- 36. Deep Dive: Forms #Basic Form class ContactForm(forms.Form): subject = forms.CharField(max_length=100) message = forms.CharField() sender = forms.EmailField() cc_myself = forms.BooleanField(required=False)
- 37. Deep Dive: Forms #Basic Form class ContactForm(forms.Form): subject = forms.CharField(max_length=100) message = forms.CharField() sender = forms.EmailField() cc_myself = forms.BooleanField(required=False) # Form based on a model class PostForm(forms.ModelForm): class Meta: model = Post
- 38. Deep Dive: Views defposts_by_type(request, type): posts = Post.objects.filter(type=type) return render_to_response( ‘postsbytype.html’, {‘posts’: posts})
- 39. Deep Dive: Views defposts_by_type(request, type): posts = Post.objects.filter(type=type) return render_to_response( ‘postsbytype.html’, {‘posts’: posts}) def new_post(request): if request.method == ‘POST’: form = PostForm(request.POST) if form.is_valid(): form.save() else: form = PostForm() return render_to_response( ‘mytemplate.html’, {‘form’: form})
- 40. Architecture RDBMS Storage ORM Fixtures Model Signals Forms Template URL Resolver View Template Loader Middleware Middleware Request Response
- 41. Deep Dive: URLs urlpatters= patterns(‘’, (’^my/favorite/color/$’, ‘blog.views.my_fav_color’), (‘^post/new/$’, ‘blog.views.new_post’), (‘^posts/(d{4})/$’, ‘blog.views.year_archive’), (‘^posts/(d{4})/(d{2})/$’, ‘blog.views.month_archive’), (‘^posts/(?P<slug>[a-z-]*)/$’, ‘blog.views.show_post’), (‘^events/$’, include(events.urls), )
- 42. Architecture RDBMS Storage ORM Fixtures Model Signals Forms Template URL Resolver View Template Loader Middleware Middleware Request Response
- 43. Architecture RDBMS Storage ORM Fixtures Model Signals Forms Template URL Resolver View Template Loader Middleware Middleware Request Response
- 44. Deep Dive: Templates <html><body> {% if posts %} {% for post in posts %} {{ post.author }}: {{ post.title }} {% endfor %} {% endif %}
- 45. Deep Dive: Templates <html><body> {% if posts %} {% for post in posts %} {{ post.author }}: {{ post.title }} {% endfor %} {% endif %} <form method=”post”> <table> {{ form }} </table> </form>
- 46. Deep Dive: Templates <html><body> {% if posts %} {% for post in posts %} {{ post.author }}: {{ post.title }} {% endfor %} {% endif %} <form method=”post”> <ul> {{ form.as_ul }} </ul> </form>
- 47. Architecture RDBMS Storage ORM Fixtures Model Signals Forms Template URL Resolver View Template Loader Middleware Middleware Request Response
- 48. Getting Started • PurePython - no compiled code • No dependencies (with the exception of the database adapter of your choice • Three-step install • D/L and extract tar • Run setup.py • Add django-admin.py to path (optional)
- 49. Initialize Your Project $django-admin.py startproject mysite $ cd mysite $ python manage.py startapp myapp $ edit settings.py and set DB Info $ python manage.py runserver http://localhost:8000
- 50. Killer Features • Legacy DB • Generic Views • Test Framework • Template Inheritance • Multi-DB • Tempalte Filters • Geodjango • Humanize • Aggregation • Runs on Jython / IronPython • JSON Serializer • Stable API Promise • Google AppEngine! • Fantastic Docs
- 51. Roll Your Own •Model Managers: Custom database API for views • Custom Template Tags: Easier to implement functionality without mixing logic/presentation
- 52. Roll Your Own •Model Managers: Custom database API for views • Custom Template Tags: Easier to implement functionality without mixing logic/presentation • ORM Layer • Model Fields • Template Engine • Form Fields • Template Loader • URL Resolver
- 53. Re-usable Apps and Pinax • Following best practices when creating your app allows others to plug in and use it • Search Google Code for *django* projects returns 1,987 results - many are apps • James Tauber created Django Hotclub to establish standards for app development and integration • Hotclub later become Pinax
- 55. Framework Death-match Photo byBruce Turner
- 56. Death-match: RoR • URL Handling • RoR: RESTful with HTTP verbs • Django: RegEx-based URL patterns • JavaScript / AJAX • RoR: XHR helpers with RJS, prototype, scriptaculous • Django: JS framework agnostic / no helpers besides serialization
- 57. Death-match: RoR • Unicode • Ruby traditionally has had issues - string is byte sequence • Python is fully Unicode since v1.6 (circa 2000) • i18n • RoR: Translations are copied - no fallback? • Django: Translations use GNU gettext-style localization - falls back to default language
- 58. Death-match: RoR • Plugins • RoR: Rich plugin API and structure • Django: Re-usable applications • Automation / Build • RoR: rake is a rich scripting language for automated tasks • Django: manage.py can do some basic tricks - CLI
- 59. Death-match: RoR • Jobs: Rails jobs out-number Django jobs 6:1 • Hype: Rails has done a fantastic job with marketing
- 60. Death-match: RoR • Jobs: Rails jobs out-number Django jobs 6:1 • Hype: Rails has done a fantastic job with marketing
- 61.
- 62.
- 63. Recap • Django iseasy • Django is fun
- 64. Recap • Django iseasy • Django is fun • Django scales
- 65. Recap • Django iseasy • Django is fun • Django scales • Django is maintainable
- 66. Recap • Django iseasy • Django is fun • Django scales • Django is maintainable • Django saves small kittens
- 67. Recap • Django iseasy • Django is fun • Django scales • Django is maintainable • Django saves small kittens • It rocks - USE IT!
- 68. Resources • http://djangoproject.com •Check out the tutorial! • http://docs.djangoproject.com • http://djangodose.com • http://www.b-list.org/ • http://pinaxproject.com • http://code.google.com/hosting/search? q=label%3aDjango
- 69. Thanks! rob@robyates.org Twitter: @Rob_Yates http://robyates.org
Editor's Notes
- #2 Survey: How many do web application development; in django; in rails
- #14 Lawrence, Kansas Since 1850&#x2019;s Family run newspaper - currently run by someone who is 70 years old that does not use a computer - assistant prints out e-mails
- #15 Adrian: Chicago Crime, Coined the term &#x201C;Database Journalism&#x201D; Simon: Early work is part of many JS frameworks, Consultant on OpenID Joined by Jacob Kaplan-Moss
- #16 First online newspaper of it&#x2019;s kind. Had a print edition of the website
- #17 &#x201C;The CMS&#x201D;
- #19 In a landscape of confusion - invent your own
- #20 Re-framed the perception of web development;
- #21 Various layers shouldn&#x2019;t know about eachother unless absolutely necessary Code should lack boilerplate - Java Make tedious aspects fast - it&#x2019;s just Python shouldn&#x2019;t do much magic
- #22 Various layers shouldn&#x2019;t know about eachother unless absolutely necessary Code should lack boilerplate - Java Make tedious aspects fast - it&#x2019;s just Python shouldn&#x2019;t do much magic
- #23 Various layers shouldn&#x2019;t know about eachother unless absolutely necessary Code should lack boilerplate - Java Make tedious aspects fast - it&#x2019;s just Python shouldn&#x2019;t do much magic
- #24 Various layers shouldn&#x2019;t know about eachother unless absolutely necessary Code should lack boilerplate - Java Make tedious aspects fast - it&#x2019;s just Python shouldn&#x2019;t do much magic
- #25 Various layers shouldn&#x2019;t know about eachother unless absolutely necessary Code should lack boilerplate - Java Make tedious aspects fast - it&#x2019;s just Python shouldn&#x2019;t do much magic
- #26 Various layers shouldn&#x2019;t know about eachother unless absolutely necessary Code should lack boilerplate - Java Make tedious aspects fast - it&#x2019;s just Python shouldn&#x2019;t do much magic
- #60 manage.py syncdb
- #61 Those too hip for non-relational databases will have to wait. Multi-DB support is coming.
- #65 Notice: more declarative programming
- #66 Notice: more declarative programming
- #70 You can generate these things dynamically
- #71 Middleware
- #72 Middleware
- #73 Middleware
- #74 Complete separation of logic and presentation - pain for things like Math or comparisons. Templates don&#x2019;t need to be HTML - JSON, e-mail, text
- #75 Complete separation of logic and presentation - pain for things like Math or comparisons. Templates don&#x2019;t need to be HTML - JSON, e-mail, text
- #76 Complete separation of logic and presentation - pain for things like Math or comparisons. Templates don&#x2019;t need to be HTML - JSON, e-mail, text
- #77 Complete separation of logic and presentation - pain for things like Math or comparisons. Templates don&#x2019;t need to be HTML - JSON, e-mail, text
- #85 PHP comparison doesn&#x2019;t count. Really a Django Rails comparison
- #91 Who is the clear winner?
- #92 Curl.com
- #93 Curl.com
- #94 Curl.com
- #95 Curl.com
- #96 Curl.com
- #97 Curl.com