this is a presentation on django i do for barcamp Malacca forgive me if it look hackish, i hack it in latex in a few hours

1. Hands on to django
November 15, 2009
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2. 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
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3. 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
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4. What is django
Django is a Web framework
Build on the python programming language
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5. 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
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6. Lets start
To start a django project
The command on terminal
python django-admin startproject example
begin demo 1
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7. 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;
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8. A little setup Part 2
DATABASE ENGINE = ’ mysql ’
DATABASE NAME = ’ exampledb ’
DATABASE USER = ’ r o o t ’
DATABASE PASSWORD = ’ r o o t ’
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9. 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
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10. 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
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11. 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 ’ ,
)
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12. 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
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13. 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 })
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14. 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 / ’)
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15. 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 / ’)
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16. 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 %}
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17. 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 ) ,
)
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18. 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 ) ) ,
)
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19. 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/
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20. Now to add some login
before we continue
django have many application that make live easier
here we first look at the authentication framework
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21. 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
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22. 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 ’ , { } )
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23. 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 ’ , { } )
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24. 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
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25. 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 ’ , { } )
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26. 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>
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27. logout
def example logout ( request ) :
logout ( request )
return HttpResponseRedirect (
’/ example / l o g i n / ’)
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28. 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 ) ,
)
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29. 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
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30. 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 / ’
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31. the best part of django
admin page is free on django
meaning you can just use enable it
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32. 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 ) ) ,
)
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33. 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 )
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34. 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 ’ ,
)
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35. now to finish up
run syncdb
python manage.py syncdb
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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
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37. that’s all folks
So Long And Thanks For All The Fish
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