Lightning talk from django-nyc on 10/8/2008. Google project is http://code.google.com/p/django-environment

1. django-environment
environment variables for django

2. use case

3. repeated access of data
I wanted to be able to access a consistent
per-user data set. UNIX-like variables such as
$USER, $HOME or any other arbitrary $VARIABLE.
I wanted to access them in views and in templates.

4. usage in application

5. in views
from environment import env
def hello(request):
print ‘Hello accessed by’, env.avatar
return render_to_response(‘hello.html’,{})

6. in templates
# views.py
from environment import env
def hello(request):
return render_to_response(‘hello.html’,{‘env’:env})
# hello.html
<p>Hello {{ env.avatar }}</p>

7. shortcut
# views.py
from environment import ctx
def hello(request):
return render_to_response(‘hello.html’,ctx())
# hello.html
<p>Hello {{ env.avatar }}</p>

8. local variables
# views.py
from environment import lctx
def hello(request):
message = ‘Howdy’
return render_to_response(‘hello.html’,lctx())
# hello.html
<p>{{ message }}, {{ env.avatar }}</p>
# output
Howdy, Loren

9. setup

10. installation
• add ‘environment’ to INSTALLED_APPS
• add ‘environment.EnvironmentMiddleware’
to MIDDLEWARE_CLASSES.
• add ‘ENVPATH’ to settings.py. Should be
path to directory where your .env file will
live.

11. environment file
# myapp.env
from environment.standard import RequestParameterGenerator,
AuthProfileGenerator
entries = (
‘params’:RequestParameterGenerator(),
‘avatar’:AuthProfileGenerator(),
‘foo’:’bar’,
)

12. generators
• String • RequestAttribute
• StringDict • AuthProfile
• URI • RequestParameter
• Function
• ConditionalAttribute
• Cookie

13. Thanks.
Questions?