1. Kausikram Krishnasayee
BEYOND DJANGO 101
Kausikram Krishnasayee

2. What do I have ? A simple application. Bare bone.
Written in 15 minutes time after reading the Django docs.
Show the application first.
Its barebone we have no authentication set. We wrote a 100 different templates for everything, and we barely got into a hackking mode.
Django 101 documentation is great. Now we will be getting beyond that.

3. What Do we want ?? We want a whole set of features. That includes:
RESTfull API calls.
Nice Api Authentication system.
Subdomains
Permissions
Restrictions.

4. What will we be touching upon??
Serialization and serializers.
Middlewares.
Auth Backends.
Testing Plugins.

5. Problem 1: I want a view to return xml.

6. What we do usually ...
Django view
Render to response
XML template

7. What we can do?
>>> from django.core.serializers import serialize
>>> serialize("xml",ul)
<?xml version="1.0" encoding="utf-8"?>
<django-objects version="1.0">
<object pk="7508" model="tweet.tweet">
<field type="CharField" name="username">kausikram</field>
<field type="CharField" name="text">This is my text</field>
<field type="DateTimeField" name="time_tweeted"> :53:02</field>
</object>
</django-objects>
>>> serialize("json",ul) [{
"pk": 7508,
"model": "tweet.tweet",
"fields": {
"username": "kausikram",
"text": “This is my text”,
"time_tweeted": " :53:07", } }]

8. Quirks: >>> from django.core.serializers import serialize
>>> serialize("xml",ul)
<?xml version="1.0" encoding="utf-8"?>
<django-objects version="1.0">
<object pk="7508" model="auth.user">
<field type="CharField" name="username">silver.nobody</field>
<field type="CharField" name="first_name">Nobody</field>
<field type="CharField" name="last_name">
</field>
<field type="CharField" name=" ">nobody</field>
<field type="CharField" name="password">sha1$d295c$64f920c5c5a4451ba02442f85b64a</field>
<field type="BooleanField"name="is_staff">False</field>
<field type="BooleanField" name="is_active">True</field>
<field type="BooleanField" name="is_superuser">False</field>
<field type="DateTimeField" name="last_login"> :53:02</field>
<field type="DateTimeField" name="date_joined"> :53:02</field>
<field to="auth.group" name="groups" rel="ManyToManyRel">
<field to="auth.permission" name="user_permissions" rel="ManyToManyRel">
</object>
</django-objects>

9. Lets write our own serializer
Step 1 : Extend django.serializer and play with it.
Step2 : Register the serializer you just wrote in your settings file.
Step 3 : Tada!

10. Serializer : Hiding fields

11. Serializer : Adding Custom Fields

12. Serializers : The Advantage
Portable
My Boss decided JSON is the coolest thing.
Editable
Err can we change The XML structure ??
Consistent
Oh Gosh! There are too many templates and views that generate random xml structures.

13. Problem 2 : I want to have a fancy pants API system that allows calls to views requiring authentication.

14. Middleware: What ?
Web Browser
Django Middlewares
Your View

15. Middleware: What are we going to do?
Our Middleware
Django Middlewares
Your View
Browser

16. Middleware : Solution
Create a middleware that will basically perform a logic operation based on the API system you implemented.
And if the logic operation ascertains a users credibility, then set request.user to equal that user's django.auth.contrib.models.User instance.

17. Problem 3 : I want a subdomain specific authentication system.

18. Auth Backends: What ? Browser Django Session Middleware
Django Auth Middleware
Other
Middlewares
django.contrib.auth's
get_user()
auth_backend's get_user()

19. Auth Backends: What ? Set request.user and call
django.contrib.auth's login
Django's
Login View
Django Login Form
django.contrib.auth's
authenticate()
auth_backend's authenticate()

20. Auth Backend : Solution
Set request.user and
call
django.contrib.auth's login
Custom
Login View
django.contrib.auth's
authenticate()
auth_backend's authenticate()

21. Problem 4: I want my test suite to be much more flexible.

22. Understanding Django Test Runner
django.db.connection
connection.creation.create_test_db()
Start of Test
django.test.utils
setup_test_environment()
django.test.utils
teardown_test_environment
django.db.connection
connection.creation.create_test_db()
Test runner iterates
over test cases

23. Django Nose Plugin Plugin's begin django.test.utils
setup_test_environment()
django.db.connection
connection.creation.create_test_db()
Plugin's finalize
Test runner iterates
over test cases
django.test.utils
teardown_test_environment
django.db.connection
connection.creation.create_test_db()

24. Django Nose Plugin: allowing multiple DB test
Overwrite
settings.DatabaseSettings
Plugin's
configure
Plugin's begin
django.test.utils
setup_test_environment()
django.db.connection
connection.creation.create_test_db()
Plugin's finalize
Test runner iterates
over test cases
django.test.utils
teardown_test_environment
django.db.connection
connection.creation.create_test_db()

25. Thank You!!