building pluggable web applications using django
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Introduction Using django Features of django Reuseable apps End Notes
Building Pluggable Web Applications using
Lakshman Prasad
Agiliq Solutions
April 21, 2010
Introduction Using django Features of django Reuseable apps End Notes
• For building database driven web applications
• Emphasis on Reuse, DRY and simplicity
Introduction Using django Features of django Reuseable apps End Notes
• For building database driven web applications
• Emphasis on Reuse, DRY and simplicity
Introduction Using django Features of django Reuseable apps End Notes
Hypothetical Application
Introduction Using django Features of django Reuseable apps End Notes
Install a pluggable app django-star-rating
$pip install django-star-rating
INSTALLED APPS = (’ d jango . c o n t r i b . auth ’ ,’ d jango . c o n t r i b . c o n t e n t t y p e s ’ ,’ d jango . c o n t r i b . s e s s i o n s ’ ,’ d jango . c o n t r i b . s i t e s ’ ,’ d jango . c o n t r i b . admin ’ ,’ s t a r r a t i n g ’ ,
)
Introduction Using django Features of django Reuseable apps End Notes
Point to an url pattern
from b l o g . models import Post
u r l p a t t e r n s = p a t t e r n s ( ’ ’ ,( r ’ ˆ$ ’ , ’ b l o g . v i e w s . i n d e x ’ ) ,( r ’ s t a r i n g /$ ’ ,{model : Post } ,’ s t a r r a t i n g . v i e w s . s t a r ’ ) ,
)
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 %}<div>
{{ page . c o n t e n t }}</ div>
. . .</body>
. . .
Introduction Using django Features of django Reuseable apps End Notes
Thats it!
Introduction Using django Features of django Reuseable apps End Notes
IntroductionDefinitionA Case Study: Youtube StarsOverviewPhilosophy
Using djangoMTV
Features of djangoFeatures
Reuseable appsWriting reuseable appsCommunity Applications
End NotesDjango StatsCommon Enterprise HurdlesOther
Introduction Using django Features of django Reuseable apps End Notes
Developed at Lawrence-Journal World
5 million hits per month
600 Contributors
Majority of the features community contributed
5 years since Open Source
Introduction Using django Features of django Reuseable apps End Notes
Philosophy
Automate repetitive tasks
Make Development Fast
Introduction Using django Features of django Reuseable apps End Notes
Convention Over Configuration
Follow Best Practices
Models-Templates-Views
Models
Introduction Using django Features of django Reuseable apps End Notes
Model Syntax
from django . db import models
c l a s s Post ( models . Model ) :t i t l e = models . 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 ( )d a t e t i m e = models . DateTimeFie ld ( )
c l a s s Meta :o r d e r i n g = ( ’−d a t e t i m e ’ , )
def u n i c o d e ( s e l f ) :return s e l f . t i t l e
c l a s s Comment ( models . Model ) :p o s t = models . Fore ignKey ( Post )t e x t = models . T e x t F i e l d ( )
Introduction Using django Features of django Reuseable apps End Notes
Model API
>>>from b l o g . models import Post , Comment>>>p o s t = Post . o b j e c t s . a l l ( ) [ 0 ]>>>post comments = p o s t . comment set . a l l ( )
Introduction Using django Features of django Reuseable apps End Notes
Admin by models alone
Introduction Using django Features of django Reuseable apps End Notes
Admin Syntax
from django . c o n t r i b import adminfrom models 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 ’ , ’ d a t e t i m e ’ )
c l a s s CommentAdmin ( admin . ModelAdmin ) :l i s t d i s p l a y = ( ’ t e x t ’ , )
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 )
List Page
Add an Entry
Auto Validation
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 . asp ?s i d =9DF4BC0580DF11D3ACB60090271E26A8
&command= f r e e l i s t
h t t p : / / p r e v i e w . ynot . com/ c g i b i n /nd CGI 50 . c g i / YnotPhoenix /CFsMain .
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
Introduction Using django Features of django Reuseable apps End Notes
django url pattern
from b l o g . models import Post
u r l p a t t e r n s = p a t t e r n s ( ’ ’ ,( 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 : Post } ,’ s t a r r a t i n g . v i e w s . s t a r ’ ) ,
)
Views
Introduction Using django Features of django Reuseable apps End Notes
django views
from django . h t t p import HttpResponse
def p o s t ( r e q u e s t ) :return HttpResponse ( ’ H e l l o World ! ’ )
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 = Post . 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 ( )
p a y l o a d = { ’ p o s t ’ : 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 ( )}
return r e n d e r t o r e s p o n s e ( ’ p o s t . html ’ ,pay load ,R e q u e s t C o n t e x t ( r e q ) )
Templates
Introduction Using django Features of django Reuseable apps End Notes
django template
{% e x t e n d s ” base . 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 %}
Features
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
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
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
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
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
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
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
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
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
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
Django Documentation
Introduction Using django Features of django Reuseable apps End Notes
General conventions adopted by the community
Introduction Using django Features of django Reuseable apps End Notes
Use template tags
<p>The t ime i s {% c u r r e n t t i m e ”%I :%M %p” %}.</p>
from django import t e m p l a t edef d o c u r r e n t t i m e ( p a r s e r , token ) :
tag name , f o r m a t s t r i n g = token . s p l i t c o n t e n t s ( )return CurrentTimeNode ( f o r m a t s t r i n g [ 1 : −1 ] )
Introduction Using django Features of django Reuseable apps End Notes
Use Signals
from django . 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 . c o n n e c t ( m y c a l l b a c k )
from django . db . models . s i g n a l s import p r e s a v efrom myapp . models import MyModel
def m y h a n d l e r ( sender , ∗∗ kwargs ) :. . .
p r e s a v e . c o n n e c t ( my handler , s e n d e r=MyModel )
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
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
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
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
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
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
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=’ r e g i s t r a t i o n d i s a l l o w e d ’ ,template name=’ 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 } ,c o n t e x t )
Introduction Using django Features of django Reuseable apps End Notes
Advanced
• Use Template Response
• Write Views as Classes
Introduction Using django Features of django Reuseable apps End Notes
Advanced
• Use Template Response
• Write Views as Classes
There is an app for that
For every size and style
Introduction Using django Features of django Reuseable apps End Notes
Github Search ”django”
Introduction Using django Features of django Reuseable apps End Notes
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• tagging• contact import (from vCard, Google or Yahoo)• photo management
Introduction Using django Features of django Reuseable apps End Notes
django-mingus
d j a n g o e x t e n s i o n sb a s i cf l a t b l o c k sd i s q u snavbard j a n g o d b l o gs o r loembdedt e m p l a t e u t i l sd j a n g o p r o x yc o m p r e s s o rd jango markupg o o g l e a n a l y t i c s
v i e w c a c h e u t i l sc o n t a c t f o r mhoneypots u g a rquotemedjango− s t a t i c f i l e sdjango−b i t l ydjango−t w i t t e rpython−t w i t t e rdjango−wysiwygdjango−s l i m m e rdjango−c r o p p e rdjango−r e q u e s t
Django users
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
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
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
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 theNebula Cloud.
Introduction Using django Features of django Reuseable apps End Notes
Enterprise Adoption Hurdles
• Multiple Databases
• Dynamic settings infrastructure
• Tools
Introduction Using django Features of django Reuseable apps End Notes
Enterprise Adoption Hurdles
• Multiple Databases
• Dynamic settings infrastructure
• Tools
Introduction Using django Features of django Reuseable apps End Notes
Enterprise Adoption Hurdles
• Multiple Databases
• Dynamic settings infrastructure
• Tools
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
http://www.agiliqsolutions.com/
Introduction Using django Features of django Reuseable apps End Notes
Image Attributions
ht tp : //www. f l i c k r . com/ photos / t e j e d o r o d e l u z /3157690060/ht tp : //www. f l i c k r . com/ photos /23820645@N05/4287681570/ht tp : //www. f l i c k r . com/ photos / a i d a n j o n e s /3575000735/ht tp : // j a c o b i a n . org /h t tp : // s a n j u a n c o l l e g e . edu/ l i b / images / p h i l o s o p h y b r a i n . j pgh t tp : //www. f l i c k r . com/ photos /uhop /105062059/ht tp : // s3 . amazonaws . com/memebox/ up load s /136/ e x p o n e n t i a l g r a p h 2 . j pgh t tp : // geekandpoke . typepad . com/geekandpoke / images /2008/06/03/ s e xp l 1 8 . j pgh t tp : //www. f l i c k r . com/ photos /go /253819/ht tp : // a round the sphe r e . f i l e s . wo rdp re s s . com/2009/05/ sw i s s−army−k n i f e . j pgh t tp : //www. f r e e f o t o . com/ images /41/04/41 04 9−−−Keep−Le f t web . j pgh t tp : //www. f l i c k r . com/ photos / o r i n r o b e r t j o h n /114430223/
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