Login

3110 snippets

Snippet List

Simple Class Based View Wrapper

After reading this article: http://blog.roseman.org.uk/2010/06/2/class-based-views-and-thread-safety/ and checking out this snippet: http://djangosnippets.org/snippets/2046/ I realized that I was using a class based view without even thinking about the consequences... so, without having to completely re-factor my existing class based views to make them singletons, I wrote this wrapper that should allow my class based views to work as I intended, and maintain state for a single request only.

  • class based views
Read More

Quiet runserver

It's quite common to use Django's `static.serve` functionality to serve media assets via the built-in development server. However, I always find that this is far too noisy - every asset produces a line of output on the console, and any debug messages I want to put there are hard to see. This management command monkey-patches the built-in `runserver` command so that it only generates a line of output for actual Django views - anything else is served as usual, but is not logged to the console. In fact the original version was already doing this for admin media, but not for your own media - I've just extended the logic. Put this in the management/commands directory of an installed app, saving it as (for example) `runserver_quiet`, then just do `./manage.py runserver_quiet` to run - it will accept all the same arguments as the built-in version.

  • runserver
  • management-command
Read More

Widget for CommaSeparatedIntegerField with pre-defined choices

Widget for editing CommaSeparatedIntegerField with a set of checkboxes. Each checkbox corresponds to single integer value. So, choices should be pre-defined for widget. **Example** Assume, we need a registration form for some event with time frame for 3 days, starting at Monday. User can select any of 3 days, so we need to show 3 checkboxes. Here's the basic example for such form: class EventRegistrationForm(forms.Form): days = forms.CharField(widget=NumbersSelectionWidget( ['Mon', 'Tue', 'Wed'], range(1, 4)))

  • forms
  • widget
  • comma-separated
Read More

Class-based coverage test runner

A coverage test runner that uses the class-based runner introduced with Django 1.2. Put it in your python path and add to your `settings.py`: TEST_RUNNER = 'path_to.CoverageRunner' COVERAGE_MODULES = [ 'blog.views', 'projects.views', 'middleware', ] Compatible with Django 1.2 and higher. You also need Ned Batchelder's `coverage.py` module (`pip install coverage`).

  • test
  • runner
  • coverage
Read More

Publishing service endpoint uri to javascript

My application is made up of two main pieces: 1) an ajax client, and 2) backend services supplying data to the ajax client. Django delivers html files that bootstrap the javascript client, which in turns calls back to Django's restful services. Most of javascript code is in static .js files that being delivered to the browser bypassing Django. When calling back into Django, I started by embedding call endpoints into the javascript code. Soon, I noticed, though, that every time I adjusted an endpoint's url in urls.py, I also had to remember to go back and adjust the javascript. This was suboptimal and violated the DRY principle. I realized that all the information I needed was already in urls.py. All that needed to be done, was to find a way to expose that information to the javascript environment. The code I'm including does exactly that. It consists of two pieces: a view function and a corresponding javascript template. The view function will go through all declared urls looking for those whose name ends with '-svc'. These urls are then converted into javascript constants by the template. The url names are slightly mangled to conform to javascript identifier conventions and if you have any url parameters, they will be encoded into something that javascript can easily replace with real values at run time. For example, `url('^blog/(?P<id>[\d]+/$', 'sample.views.showblog', name='blog-entry')` will become `svc.__BLOG_ENTRY = "/blog/{id}/"` to get the uri from your javascript code, you simply make this call: `svc('BLOG_ENTRY', {id: 12345})` and you'll get back `/blog/12345/` Requirements: the javascript template assumes availability of the Namespace library by Maxime Bouroumeau-Fuseau (http://code.google.com/p/namespacedotjs/)

  • javascript
  • urls
  • url
  • service
  • endpoint
Read More

{% renderonce %} template tag

This is in the spirit of php's include_once or a C preprocessor #ifndef. Kind of. As you might've guessed, the output of {% renderonce %}foo{% endrenderonce %} {% renderonce %}foo{% endrenderonce %} in a template will be a single 'foo'. I use it for js script tags personally, to prevent duplicate inclusions. If you ended up here, chances are you've already explored the "use inheritance" or "use django-(app X)" solutions, so feel free to omit such comments.

  • templatetag
  • include
Read More

Testserver: --noinput option, sending a signal

Makes manage.py testserver accept a `--noinput` argument to delete test database without asking if it already exists; makes it emit `django.core.management.commands.testserver.testserver_setup` signal after fixtures are loaded and before server itself is started to allow custom postprocessing.

  • django
  • patch
  • testserver
Read More

urlize HTML

The default Django urlize filter does not work with html nicely so here I've used an HTML parser [BeautifulSoup](http://www.crummy.com/software/BeautifulSoup/) to quickly search through each text node and run the django urlize filter on it. Optimizations could be made to include a regex in the soup.findAll() method's text argument to only search those text nodes which matched a url pattern. You could also modify the method to convert the text to urls, such as using your own custom url filter.

  • beautifulsoup
  • html
  • urlize
  • parser
  • html parser
Read More

Python-like string interpolation in Javascript

Provides python-like string interpolation. It supports value interpolation either by keys of a dictionary or by index of an array. Examples: interpolate("Hello %s.", ["World"]) == "Hello World." interpolate("Hello %(name)s.", {name: "World"}) == "Hello World." interpolate("Hello %%.", {name: "World"}) == "Hello %." This version doesn't do any type checks and doesn't provide formating support.

  • template
  • javascript
  • string interpolation
  • replace
Read More

Django Jalali Calendar Widget

This is a simple calendar widget in Django 1.2 for Jalali Calendar usages. It actually sends a Gregorian value to server, so if you need further manipulations, you can use [GNU Jalali Calendar](http://home.gna.org/jalali-calendar/). You should also have [JalaliJSCalendar](http://farhadi.ir/works/jalalijscalendar) set up in your project. Also posted on: [Django Jalali Calendar Widget](http://texscribbles.blogspot.com/2010/06/django-jalali-calendar-widget.html)

  • calendar
  • widget
  • jalali
  • farsi
  • persian
Read More

NoneWidget

Sometime may be useful to disable the HTML output from formfield to template.

  • widgets
  • widget
Read More