a hands on guide to django

Hands on to django November 15, 2009 () Hands on to django November 15, 2009 1 / 36

disclaimer this is based on my brief experience in django a lot is from my job experience a lot of the code does not look this way, i just clean it up and cram a lot of space () Hands on to django November 15, 2009 2 / 36

the slide and code is on the web the code is bitbucket.org http://bitbucket.org/sweemeng/barcamp-malacca/ slide is on slideshare.net http://www.slideshare.net/sweemenghacker/a-hands-on-guide-to-django () Hands on to django November 15, 2009 3 / 36

What is django Django is a Web framework Build on the python programming language () Hands on to django November 15, 2009 4 / 36

What you will need You will need python, I use python 2.6, because ubuntu uses it a database, I use mysql python-mysql for mysql and thats pretty much everything () Hands on to django November 15, 2009 5 / 36

Lets start To start a django project The command on terminal python django-admin startproject example begin demo 1 () Hands on to django November 15, 2009 6 / 36

A little setup Part 1 A few ﬁles is created form the command previously File list manage.py settings.py templates urls.py Now we concern on settings.py Before that create a database in mysql create database create database exampledb; () Hands on to django November 15, 2009 7 / 36

A little setup Part 2 DATABASE ENGINE = ’ mysql ’ DATABASE NAME = ’ exampledb ’ DATABASE USER = ’ r o o t ’ DATABASE PASSWORD = ’ r o o t ’ () Hands on to django November 15, 2009 8 / 36

Let start an app A django project is consist of multiple applications To start an app, use manage.py start a django apps python manage.py startapp exampleapp The newly create app folder should have example content init .py models.py tests.py urls.py views.py () Hands on to django November 15, 2009 9 / 36

What ORM? django talk to database using ORM ORM == Object Relational Mapper It is used to model a database table into object start create one in exampleapp/models.py from d j a n g o . db i m p o r t m o d e l s # Create your models here . c l a s s Example ( m o d e l s . Model ) : name = m o d e l s . T e x t F i e l d ( ) s c o r e = models . I n t e g e r F i e l d ( ) Django models ﬁeld also have ﬁeld like email, and image () Hands on to django November 15, 2009 10 / 36

lets prepare our application before we can run our application a little setup 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 ’ , ’ exampleapp ’ , ) () Hands on to django November 15, 2009 11 / 36

setup redux now setting up the database creating the table python manage.py syncdb when prompt to create new superuser, just type yes and ﬁll in the infor what ever you wanted () Hands on to django November 15, 2009 12 / 36

now to create a basic view in exampleapps/views.py from d j a n g o . h t t p i m p o r t H t t p R e s p o n s e from d j a n g o . h t t p i m p o r t H t t p R e s p o n s e R e d i r e c t from d j a n g o . s h o r t c u t s i m p o r t r e n d e r t o r e s p o n s e # Create your views here . from m o d e l s i m p o r t ∗ def example view ( request ) : i f r e q u e s t . method == ’POST ’ : d a t a = Example ( name = r e q u e s t . POST . g e t ( ’ p o s t i n g ’ ) , s c o r e = 0) data . save () r e s = Example . o b j e c t s . a l l ( ) r e t u r n r e n d e r t o r e s p o n s e ( ’ e x a m p l e / t e m p l a t e . html ’ , { ’ res ’ : r e s }) () Hands on to django November 15, 2009 13 / 36

add this extra views def example like ( request , id ) : d a t a = Example . o b j e c t s . g e t ( i d=i d ) data . s c o r e = data . s c o r e + 1 data . save () r e t u r n H ttp Re sp ons eR ed ire ct ( ’/ example / ’) () Hands on to django November 15, 2009 14 / 36

add this extra views def example hate ( request , id ) : d a t a = Example . o b j e c t s . g e t ( i d=i d ) data . s c o r e = data . s c o r e − 1 data . save () r e t u r n H ttp Re sp ons eR ed ire ct ( ’/ example / ’) () Hands on to django November 15, 2009 15 / 36

now create template <html> <head> </head> <body> <b r/><a h r e f =’/ e x a m p l e / l o g o u t /’> l o g o u t </a> <form method =’ p o s t ’ a c t i o n =’/ e x a m p l e /’> F i l l in your s t a t u s <b r/>< t e x t a r e a name=’ p o s t i n g ’></ t e x t a r e a > <b r/><i n p u t t y p e =’ submit ’ v a l u e =’ submit ’/> </form> <b r/> {% f o r d i n r e s %} {{ d . name}} {{ d . s c o r e }}< b r/> <a h r e f =”/ e x a m p l e / l i k e /{{ d . i d }}/”> l i k e </a> <a h r e f =”/ e x a m p l e / h a t e /{{ d . i d }}/”> h at e </a><b r/> {% e n d f o r %} </body> () Hands on to django November 15, 2009 16 / 36

almost there ﬁrst create urls.py in exampleapps from d j a n g o . c o n f . u r l s . d e f a u l t s i m p o r t ∗ from v i e w s i m p o r t ∗ urlpatterns = patterns ( ’ ’ , ( r ’ˆ $ ’ , example view ) , ( r ’ ˆ l i k e / ( d+)/$ ’ , e x a m p l e l i k e ) , ( r ’ ˆ h a t e / ( d+)/$ ’ , e x a m p l e h a t e ) , ) () Hands on to django November 15, 2009 17 / 36

still going and add a new entry in the main urls.py from d j a n g o . c o n f . u r l s . d e f a u l t s i m p o r t ∗ # Uncomment t h e n e x t two l i n e s t o e n a b l e t h e admin : #from d j a n g o . c o n t r i b i m p o r t admin #admin . a u t o d i s c o v e r ( ) urlpatterns = patterns ( ’ ’ , ( r ’ ˆ example / ’ , i n c l u d e ( ’ exampleapp . u r l s ’ ) ) , ( r ’ ˆ admin / ’ , i n c l u d e ( admin . s i t e . u r l s ) ) , ) () Hands on to django November 15, 2009 18 / 36

now run the program run the internal server python manage.py runserver and test the app by pointing your browser point browser to this address localhost:8000/examples/ () Hands on to django November 15, 2009 19 / 36

Now to add some login before we continue django have many application that make live easier here we ﬁrst look at the authentication framework () Hands on to django November 15, 2009 20 / 36

ﬁrst we import some modules from django . contrib . auth . d e c o r a t o r s import l o g i n r e q u i from django . contrib . auth import a u t h e n t i c a t e from django . contrib . auth import l o g i n from django . contrib . auth import l o g o u t from django . contrib . auth . models import User BTW the apps is installed by default () Hands on to django November 15, 2009 21 / 36

lets enable registration. The user registration just need the username,password,email here is the view def example register ( request ) : i f r e q u e s t . method == ’POST ’ : username = r e q u e s t . POST . g e t ( ’ username ’ ) p a s s w o r d = r e q u e s t . POST . g e t ( ’ p as sw or d ’ ) e m a i l = r e q u e s t . POST . g e t ( ’ e m a i l ’ ) u s e r = U s e r . o b j e c t s . c r e a t e u s e r ( username , email , password ) user . save () return HttpResponseRedirect ( ’/ example / l o g i n / ’) else : return render to response ( ’ e x a m p l e / r e g i s t e r . html ’ , { } ) () Hands on to django November 15, 2009 22 / 36

the templates def example register ( request ) : i f r e q u e s t . method == ’POST ’ : username = r e q u e s t . POST . g e t ( ’ username ’ ) p a s s w o r d = r e q u e s t . POST . g e t ( ’ p as sw or d ’ ) e m a i l = r e q u e s t . POST . g e t ( ’ e m a i l ’ ) u s e r = U s e r . o b j e c t s . c r e a t e u s e r ( username , email , password ) user . save () return HttpResponseRedirect ( ’/ example / l o g i n / ’) else : return render to response ( ’ e x a m p l e / r e g i s t e r . html ’ , { } ) () Hands on to django November 15, 2009 23 / 36

lets login def example login ( request ) : i f r e q u e s t . method == ’POST ’ : u s e r n a m e = r e q u e s t . POST . g e t ( ’ username ’ ) p a s s w o r d = r e q u e s t . POST . g e t ( ’ p as sw ord ’ ) u s e r = a u t h e n t i c a t e ( username = u s e r n a m e , password = password ) #c o n t i n u e d n e x t page () Hands on to django November 15, 2009 24 / 36

continued #from p r e v i o u s page i f u s e r i s n o t None : i f user . i s a c t i v e : login ( request , user ) return HttpResponseRedirect ( ’/ example / ’) else : return HttpResponseRedirect ( ’/ example / l o g i n / ’) else : return HttpResponseRedirect ( ’/ example / l o g i n / ’) else : return render to response ( ’ e x a m p l e / l o g i n . html ’ , { } ) () Hands on to django November 15, 2009 25 / 36

and the login page <html> <head> </head> <body> <form a c t i o n =’/ e x a m p l e / l o g i n / ’ method =’ p o s t ’> <b r/>< l a b e l >username :</ l a b e l > <i n p u t t y p e =’ t e x t ’ name=’ username ’/> <b r/>< l a b e l >p a s s w o r d :</ l a b e l > <i n p u t t y p e =’ passwo rd ’ name=’ pa ss wo rd ’/> <b r/><i n p u t t y p e =’ submit ’ v a l u e =’ submit ’/> </form> </body> </html> () Hands on to django November 15, 2009 26 / 36

logout def example logout ( request ) : logout ( request ) return HttpResponseRedirect ( ’/ example / l o g i n / ’) () Hands on to django November 15, 2009 27 / 36

now to make it works urlpatterns = patterns ( ’ ’ , ( r ’ˆ $ ’ , example view ) , ( r ’ ˆ l o g i n /$ ’ , e x a m p l e l o g i n ) , ( r ’ ˆ r e g i s t e r /$ ’ , e x a m p l e r e g i s t e r ) , ( r ’ ˆ l o g o u t /$ ’ , e x a m p l e l o g o u t ) , ( r ’ ˆ l i k e / ( d+)/$ ’ , e x a m p l e l i k e ) , ( r ’ ˆ h a t e / ( d+)/$ ’ , e x a m p l e h a t e ) , ) () Hands on to django November 15, 2009 28 / 36

to apply it to our apps to apply login needed for our views just add a line called @login required it will force a login () Hands on to django November 15, 2009 29 / 36

a little setup again add the following line to settings.py LOGIN URL = ’ / e x a m p l e / l o g i n / ’ LOGOUT URL = ’ / e x a m p l e / l o g i n / ’ () Hands on to django November 15, 2009 30 / 36

the best part of django admin page is free on django meaning you can just use enable it () Hands on to django November 15, 2009 31 / 36

still going uncomment admin stuﬀ in in the main urls.py from d j a n g o . c o n f . u r l s . d e f a u l t s i m p o r t ∗ from d j a n g o . c o n t r i b i m p o r t admin admin . a u t o d i s c o v e r ( ) urlpatterns = patterns ( ’ ’ , ( r ’ ˆ example / ’ , i n c l u d e ( ’ exampleapp . u r l s ’ ) ) , ( r ’ ˆ admin / ’ , i n c l u d e ( admin . s i t e . u r l s ) ) , ) () Hands on to django November 15, 2009 32 / 36

now to create admin.py from d j a n g o . c o n t r i b i m p o r t admin from m o d e l s i m p o r t ∗ admin . s i t e . r e g i s t e r ( Example ) () Hands on to django November 15, 2009 33 / 36

install the admin apps 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 ’ , ’ exampleapp ’ , ) () Hands on to django November 15, 2009 34 / 36

now to ﬁnish up run syncdb python manage.py syncdb () Hands on to django November 15, 2009 35 / 36

in the end this is just a demo on a few thing on django django oﬀer a lot more builtin feed syndication,commenting,tagging,GIS () Hands on to django November 15, 2009 36 / 36

that’s all folks So Long And Thanks For All The Fish () Hands on to django November 15, 2009 37 / 36

a hands on guide to django

by swee meng ng on Nov 14, 2009

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