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Jinja2 integration + application specific functions/filters/tests

Jinja2 is an alternative template system that can be plugged into django. It offers greator flexibility in presentation logic; if you find the django template system too restrictive, you should have a look at Jinja2 (The syntax is very similar). In Jinja, you don't need costum tags (most of the time), because you can call functions and pass them parameters too! The only problem is that you cannot "load" functions from the template, this "loading" must be done by the code that renders the template. Same goes for filters and tests. If you need only two or three functions/filters, no problem, you can manually add them to the Environment object; but this method doesn't really scale with real-life webapps. This module/snippet offers a solution by allowing the user to define application-specific functions and filters and load them into the jinja2 environment automatically. Here's how to use this: 1. Install Jinja2 (for a quick & dirty installation, you can just put the jinja2 folder in a folder that's in PYTHONPATH) 2. Save this python module somewhere and call it something meaningful (I have it as jinja.py in my project directory) 3. Whenever you need to respond (an HttpResponse) with a template that's rendered by jinja, import this module and call `return jrespond( template_name, context )` 4. Any filters or functions you define in any of your applications will be readily available inside the template (see the documentation in code)

  • template
  • templates
  • jinja
  • template-tags
  • jinja2
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Session-backed FormWizard

A rewrite of the django.contrib.formtools.FormWizard class to be session-based instead of saving state in hidden form variables. It started out as a simple port of the standard FormWizard class, and much of the original behavior was unchanged because I wanted to limit the scope of the "rewrite". Along the way I think I made it a bit more OO, and a bit more flexible, but there are still warts. I threw this code up here before I was completely happy with it just to take part in the discussion around [this ticket][http://code.djangoproject.com/ticket/9200 "Django Ticket #9200]. There's certainly a few things that the patch on that ticket does that I'd like to incorporate into my Wizard, whenever time allows.

  • forms
  • session
  • wizard
  • formtools
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Chunks template filter

A simple filter which divides an iterable (list, tupe, string, etc) in chunks, which can then be iterated over separately. A sample of the filter usage is given: a gallery template in which I needed to display images in a table, three images per row, one row for images followed by one row for their descriptions.

  • template
  • filter
  • chunks
  • for
  • iterable
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StrictAuthentication - Auto log-out inactive users

This dead-simple piece of middleware adds a terrific security feature to django authentication. Currently, users who's accounts are de-activated still may have a cookie and a login session. This middleware destroys that session on their next request. Simply add this class into a middleware.py and add it to your settings.

  • middleware
  • authentication
  • security
  • sessions
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RangeField and RangeWidget

These field and widget are util for to those fields where you can put a star and end values. It supports most of field types and widgets (tested with IntegerField, CharField and DateField / TextInput and a customized DateInput). **Example of use:** class FormSearch(forms.Form): q = forms.CharField(max_length=50, label=_('Search for')) price_range = RangeField(forms.IntegerField, required=False) **Example of use (with forced widget):** class FormSearch(forms.Form): q = forms.CharField(max_length=50, label=_('Search for')) price_range = RangeField(forms.IntegerField, widget=MyWidget)

  • forms
  • field
  • widget
  • range
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Chain multiple querysets into one

This class acts as a wrapper around multiple querysets. Use it if you want to chain multiple QSs together without combining them with | or &. eg., to put title matches ahead of body matches: >>> qs1 = Event.objects.filter(## title matches ##) >>> qs2 = Event.objects.filter(## matches in other fields ##) >>> qs = MultiQuerySet(qs1, qs2) >>> len(qs) >>> paginator = Paginator(qs) >>> first_ten = qs[:10] It effectively acts as an immutable, sliceable QuerySet (with only a very limited subset of the QuerySet api)

  • queryset
  • chain
  • multi
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Add URL Segments to Templates

Add this code to you your context_processors.py in your project and then install it in your settings.py TEMPLATE_CONTEXT_PROCESSORS. In your template you can print out a segment of a url by using {{ segment_1 }}. For example if you're on the page "/mysite/section1/section2/" and you used {{ segment_2 }} it would print section1. This idea was taken from Expression Engines URL Segments, http://expressionengine.com/docs/templates/globals/url_segments.html. This comes in handy if you only want to do something in your template if the page your on has a particular segment. FYI, I haven't used this in a production setting yet so it could be buggy still.

  • template
  • url
  • path
  • segment
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resize to thumbnail with scale-to-fill

**So you can upload rectangular pictures but still have square thumbnails.** "Scale to **fill**" instead of the out of the box "scale to **fit**" you get with `Image.thumbnail`

  • image
  • pil
  • thumbnail
  • resize
  • imagefield
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change SITE_ID on fly

Django SITE_ID is a global setting, so the site framework requires you to run multiple instances of Django; at least one for each site. But i want have one instance for multiple sites. This snippet solve this task by change SITE_ID on fly. /sorry my bad english/

  • settings
  • site_id
  • site-contrib
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iPhoneMiddleware

Adds an additional template dir to settings.TEMPLATE_DIRS if the request's HTTP_USER_AGENT string has the word iPhone in it. Allows you to easily create iPhone templates.

  • middleware
  • user-agent
  • iphone
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