Building Pluggable Web Applications using Django

1. Introduction Using django Features of django Reuseable apps End Notes Building Pluggable Web Applications using Lakshman Prasad Agiliq Solutions April 21, 2010

2. Introduction Using django Features of django Reuseable apps End Notes • For building database driven web applications

3. Introduction Using django Features of django Reuseable apps End Notes • For building database driven web applications • Emphasis on Reuse, DRY and simplicity

4. Introduction Using django Features of django Reuseable apps End Notes Hypothetical Application

5. Introduction Using django Features of django Reuseable apps End Notes Install a pluggable app django-star-rating $pip install django-star-rating INSTALLED APPS = ( ’ django . c o n t r i b . auth ’ , ’ django . c o n t r i b . contenttypes ’ , ’ django . c o n t r i b . sessions ’ , ’ django . c o n t r i b . sites ’ , ’ django . c o n t r i b . admin ’ , ’ starrating ’ , )

6. Introduction Using django Features of django Reuseable apps End Notes Point to an url pattern from b l o g . m o d e l s import P o s t urlpatterns = patterns ( ’ ’ , ( r ’ ˆ$ ’ , ’ b l o g . v i e w s . i n d e x ’ ) , ( r ’ s t a r i n g /$ ’ , { model : P o s t } , ’ s t a r r a t i n g . views . star ’ ) , )

7. Introduction Using django Features of django Reuseable apps End Notes Put the rating where you want! <html> <head> < t i t l e>{{ page . t i t l e }}</ t i t l e> <body> {% s t a r r a t i n g %} <d i v> {{ page . c o n t e n t }} </ d i v> ... </body> ...

8. Introduction Using django Features of django Reuseable apps End Notes Thats it!

9. Introduction Using django Features of django Reuseable apps End Notes Introduction Deﬁnition A Case Study: Youtube Stars Overview Philosophy Using django MTV Features of django Features Reuseable apps Writing reuseable apps Community Applications End Notes Django Stats Common Enterprise Hurdles Other

10. Introduction Using django Features of django Reuseable apps End Notes Developed at Lawrence-Journal World

11. 5 million hits per month

12. 600 Contributors

13. Majority of the features community contributed

14. 5 years since Open Source

15. Introduction Using django Features of django Reuseable apps End Notes Philosophy

16. Automate repetitive tasks

17. Make Development Fast

18. Introduction Using django Features of django Reuseable apps End Notes Convention Over Conﬁguration

19. Follow Best Practices

20. Models-Templates-Views

21. Models

22. Introduction Using django Features of django Reuseable apps End Notes Model Syntax from d j a n g o . db import m o d e l s c l a s s P o s t ( m o d e l s . Model ) : t i t l e = m o d e l s . C h a r F i e l d ( m a x l e n g t h =100) t e x t = models . T e x t F i e l d ( ) datetime = models . DateTimeField ( ) c l a s s Meta : o r d e r i n g = ( ’−d a t e t i m e ’ , ) def unicode ( self ): return s e l f . t i t l e c l a s s Comment ( m o d e l s . Model ) : post = models . ForeignKey ( Post ) t e x t = models . T e x t F i e l d ( )

23. Introduction Using django Features of django Reuseable apps End Notes Model API >>>from b l o g . m o d e l s import Post , Comment >>>p o s t = P o s t . o b j e c t s . a l l ( ) [ 0 ] >>>p o s t c o m m e n t s = p o s t . c om m en t s et . a l l ( )

24. Introduction Using django Features of django Reuseable apps End Notes Admin by models alone

25. Introduction Using django Features of django Reuseable apps End Notes Admin Syntax from d j a n g o . c o n t r i b import admin from m o d e l s import Post , Comment c l a s s PostAdmin ( admin . ModelAdmin ) : l i s t d i s p l a y = ( ’ t i t l e ’ , ’ datetime ’ ) c l a s s CommentAdmin ( admin . ModelAdmin ) : l i s t d i s p l a y = ( ’ text ’ ,) admin . s i t e . r e g i s t e r ( Post , PostAdmin ) admin . s i t e . r e g i s t e r ( Comment , CommentAdmin )

26. List Page

27. Add an Entry

28. Auto Validation

29. Introduction Using django Features of django Reuseable apps End Notes Ugly urls h t t p : / / a r t . com/ a r t g a l l e r y / d e f a u l t . a s p ? s i d =9DF4BC0580DF11D3ACB60090271E26A8 &command= f r e e l i s t h t t p : / / p r e v i e w . y n o t . com/ c g i b i n / n d C G I 5 0 . c g i / Y n o t P h o e n i x / CFsMain .

30. Introduction Using django Features of django Reuseable apps End Notes Good urls h t t p : / /www. w i r e d . com/ a p p l e / MacbookPro / h t t p : / / devmarch . com/ d e v e l o p e r s u m m i t / s p e a k e r s . html

31. Introduction Using django Features of django Reuseable apps End Notes django url pattern from b l o g . m o d e l s import P o s t urlpatterns = patterns ( ’ ’ , ( r ’ ˆ$ ’ , ’ b l o g . v i e w s . i n d e x ’ ) , ( r ’ s t a r i n g /$ ’ , { model : P o s t } , ’ s t a r r a t i n g . views . star ’ ) , )

32. Views

33. Introduction Using django Features of django Reuseable apps End Notes django views from d j a n g o . h t t p import H t t p R e s p o n s e def p o s t ( r e q u e s t ) : r e t u r n H t t p R e s p o n s e ( ’ H e l l o World ! ’ )

34. Introduction Using django Features of django Reuseable apps End Notes django views def p o s t ( r e q u e s t , p o s t i d ) : p o s t = P o s t . o b j e c t s . g e t ( pk=p o s t i d ) i f r e q . method == ’POST ’ : comment form = CommentForm ( r e q u e s t . POST) comment = comment form . s a v e ( ) payload = { ’ post ’ : post , ’ comments ’ : Comment . o b j e c t s . f i l t e r ( p o s t i d=p o s t i d ) , ’ comment form ’ : CommentForm ( ) } r e t u r n r e n d e r t o r e s p o n s e ( ’ p o s t . html ’ , payload , RequestContext ( req ))

35. Templates

36. Introduction Using django Features of django Reuseable apps End Notes django template {% e x t e n d s ” b a s e . html ” %} {% b l o c k body %} {% i f u s e r . i s a u t h e n t i c a t e d %} Welcome {{ u s e r . g e t f u l l n a m e }} {% e l s e %} {% i n c l u d e ” l o g i n . html ” %} {% e n d i f %} ... {% e n d b l o c k %}

37. Features

38. Introduction Using django Features of django Reuseable apps End Notes • Admin Interface

39. Introduction Using django Features of django Reuseable apps End Notes • Admin Interface • Generic Views

40. Introduction Using django Features of django Reuseable apps End Notes • Admin Interface • Generic Views • Testing Tools

41. Introduction Using django Features of django Reuseable apps End Notes • Admin Interface • Generic Views • Testing Tools • Sessions

42. Introduction Using django Features of django Reuseable apps End Notes • Admin Interface • Generic Views • Testing Tools • Sessions • Authentication

43. Introduction Using django Features of django Reuseable apps End Notes • Admin Interface • Generic Views • Testing Tools • Sessions • Authentication • Caching

44. Introduction Using django Features of django Reuseable apps End Notes • Admin Interface • Generic Views • Testing Tools • Sessions • Authentication • Caching • Internationalization

45. Introduction Using django Features of django Reuseable apps End Notes • Admin Interface • Generic Views • Testing Tools • Sessions • Authentication • Caching • Internationalization • RSS

46. Introduction Using django Features of django Reuseable apps End Notes • Admin Interface • Generic Views • Testing Tools • Sessions • Authentication • Caching • Internationalization • RSS • CSRF protection

47. Introduction Using django Features of django Reuseable apps End Notes • Admin Interface • Generic Views • Testing Tools • Sessions • Authentication • Caching • Internationalization • RSS • CSRF protection • File Storage

48. Django Documentation

49. Introduction Using django Features of django Reuseable apps End Notes General conventions adopted by the community

50. Introduction Using django Features of django Reuseable apps End Notes Use template tags <p>The t i m e i s {% c u r r e n t t i m e ”%I :%M %p” %}.</p> from d j a n g o import t e m p l a t e def d o c u r r e n t t i m e ( p a r s e r , t o k e n ) : tag name , f o r m a t s t r i n g = t o k e n . s p l i t c o n t e n t s ( ) r e t u r n CurrentTimeNode ( f o r m a t s t r i n g [ 1 : − 1 ] )

51. Introduction Using django Features of django Reuseable apps End Notes Use Signals from d j a n g o . c o r e . s i g n a l s import r e q u e s t f i n i s h e d r e q u e s t f i n i s h e d . connect ( my callback ) from d j a n g o . db . m o d e l s . s i g n a l s import p r e s a v e from myapp . m o d e l s import MyModel def m y h a n d l e r ( s e n d e r , ∗∗ k w a r g s ) : ... p r e s a v e . c o n n e c t ( m y h a n d l e r , s e n d e r=MyModel )

52. Introduction Using django Features of django Reuseable apps End Notes Basics • Take template_name and extra_context every where

53. Introduction Using django Features of django Reuseable apps End Notes Basics • Take template_name and extra_context every where • Write urls in applications

54. Introduction Using django Features of django Reuseable apps End Notes Basics • Take template_name and extra_context every where • Write urls in applications • Import from the application level

55. Introduction Using django Features of django Reuseable apps End Notes Basics • Take template_name and extra_context every where • Write urls in applications • Import from the application level • Preﬁx template name with directory

56. Introduction Using django Features of django Reuseable apps End Notes Basics • Take template_name and extra_context every where • Write urls in applications • Import from the application level • Preﬁx template name with directory • Use MEDIA_URL in templates

57. Introduction Using django Features of django Reuseable apps End Notes Basics • Take template_name and extra_context every where • Write urls in applications • Import from the application level • Preﬁx template name with directory • Use MEDIA_URL in templates • Reverse url patterns

58. Introduction Using django Features of django Reuseable apps End Notes Basics Done right def r e g i s t e r ( r e q u e s t , backend , s u c c e s s u r l=None , f o r m c l a s s=None , d i s a l l o w e d u r l= ’ registration disallowed ’ , t e m p l a t e n a m e= ’ r e g i s t r a t i o n / r e g i s t r a t i o n f o r m . html ’ , e x t r a c o n t e x t=None ) : ... return r e n d e r t o r e s p o n s e ( template name , { ’ form ’ : form } , context )

59. Introduction Using django Features of django Reuseable apps End Notes Advanced • Use Template Response

60. Introduction Using django Features of django Reuseable apps End Notes Advanced • Use Template Response • Write Views as Classes

61. There is an app for that

62. For every size and style

63. Introduction Using django Features of django Reuseable apps End Notes Github Search ”django”

64. Introduction Using django Features of django Reuseable apps End Notes

65. Introduction Using django Features of django Reuseable apps End Notes Pinax Features • openid support • email veriﬁcation • password management • site announcements • a notiﬁcation framework • user-to-user messaging • friend invitation (both internal and external to the site) • a basic twitter clone • oembed support • gravatar support • interest groups (called tribes) • projects with basic task and issue management • threaded discussions • wikis with multiple markup support • blogging • bookmarks

66. Introduction Using django Features of django Reuseable apps End Notes django-mingus django extensions view cache utils basic contact form flatblocks honeypot disqus sugar navbar quoteme djangodblog django− s t a t i c f i l e s sorl django−b i t l y oembded d j a n g o −t w i t t e r template utils python−t w i t t e r django proxy d j a n g o −wysiwyg compressor d j a n g o −s l i m m e r django markup d j a n g o −c r o p p e r google analytics d j a n g o −r e q u e s t

67. Django users

68. Introduction Using django Features of django Reuseable apps End Notes Popular Users • Media • LA Times • NY Times • Washington Post • Guardian

69. Introduction Using django Features of django Reuseable apps End Notes Popular Users • Media • LA Times • NY Times • Washington Post • Guardian • Web2.0 • Mahalo: 10 million Page views • Pownce, SixApart

70. Introduction Using django Features of django Reuseable apps End Notes Popular Users • Media • LA Times • NY Times • Washington Post • Guardian • Web2.0 • Mahalo: 10 million Page views • Pownce, SixApart • Full List: djangosites.com

71. Introduction Using django Features of django Reuseable apps End Notes NASA After an extensive trade study, we selected Django ... as the ﬁrst and primary application environment for the Nebula Cloud.

72. Introduction Using django Features of django Reuseable apps End Notes Enterprise Adoption Hurdles • Multiple Databases

73. Introduction Using django Features of django Reuseable apps End Notes Enterprise Adoption Hurdles • Multiple Databases • Dynamic settings infrastructure

74. Introduction Using django Features of django Reuseable apps End Notes Enterprise Adoption Hurdles • Multiple Databases • Dynamic settings infrastructure • Tools

75. Introduction Using django Features of django Reuseable apps End Notes About Me • lakshman@agiliqsolutions.com, @becomingGuru • lakshmanprasad.com • Agiliq Solutions Formerly, Usware Technologies @agiliq • Team of Expert Django Developers, Happy Clients

76. http://www.agiliqsolutions.com/

77. Introduction Using django Features of django Reuseable apps End Notes Image Attributions h t t p : / /www . f l i c k r . com/ p h o t o s / t e j e d o r o d e l u z /3157690060/ h t t p : / /www . f l i c k r . com/ p h o t o s /23820645 @N05 /4287681570/ h t t p : / /www . f l i c k r . com/ p h o t o s / a i d a n j o n e s /3575000735/ http :// j a c o b i a n . org / h t t p : / / s a n j u a n c o l l e g e . edu / l i b / i m a g e s / p h i l o s o p h y b r a i n . j p g h t t p : / /www . f l i c k r . com/ p h o t o s / uhop /105062059/ h t t p : / / s 3 . amazonaws . com/memebox/ u p l o a d s /136/ e x p o n e n t i a l g r a p h 2 . j p g h t t p : / / g e e k a n d p o k e . t y p e p a d . com/ g e e k a n d p o k e / i m a g e s /2008/06/03/ s e x p l 1 8 . j p g h t t p : / /www . f l i c k r . com/ p h o t o s / go /253819/ h t t p : / / a r o u n d t h e s p h e r e . f i l e s . w o r d p r e s s . com /2009/05/ s w i s s −army−k n i f e . j p g h t t p : / /www . f r e e f o t o . com/ i m a g e s /41/04/41 0 4 9− −Keep−L e f t w e b . j p g − h t t p : / /www . f l i c k r . com/ p h o t o s / o r i n r o b e r t j o h n /114430223/

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