MPTTModelAdmin

This builds on a couple of other people's hacks to effectively manage django-mptt models via the admin. One problem you find is if you use the actions drop-down menu to ‘delete selected’ items from your mptt model… the bulk actions bypass the model’s delete method so your left/right values for the tree aren’t updated. What you need is a way to automatically rebuild the tree after a bulk action. This code provides that facility. Full details on my blog: [http://anentropic.wordpress.com/2009/10/26/](http://anentropic.wordpress.com/2009/10/26/making-admin-bulk-delete-action-work-with-django-mptt/)

• admin
• mptt

Mon 09 May 2011 Read More

Middleware: Record ownership screener

UPDATE: 'ORDER BY' in de regex is now optional If enabled while coding just keep track of your console output for: <<< WARNING >>> Query execution without ownership clause, called from "process_response" Happy coding Regards, Gerard.

• middleware
• user
• permission
• ownership
• created_by

Sun 11 Jul 2010 Read More

Improved generic foreign key manager 2

This is an improvement on [snippet 1079](http://www.djangosnippets.org/snippets/1079/). Please read its description and [this blog post](http://zerokspot.com/weblog/2008/08/13/genericforeignkeys-with-less-queries/) for any information. This is a manager for handling generic foreign key. Generic foreign objects of the same type are fetched together in order to reduce the number of SQL queries. To use, just assign an instance of GFKManager as the objects attribute of a model that has generic foreign keys. Then: `MyModelWithGFKs.objects.filter(...).fetch_generic_relations()` The generic related items will be bulk-fetched to minimize the number of queries. **Improvement:** Problem I had with previous version from snippet 1079 : if two or more items shares the same generic foreign object, then only the first one is cached. Next ones generates new unwanted SQL queries. I solved this problem by putting all the needed foreign objects in a temporary data_map dictionary. Then, the objects are distributed to every items, so that if two items shares the same foreign object, it will only be fetched once.

• foreignkey
• generic
• manager
• query
• tuning

Fri 25 Feb 2011 Read More

Strip Google Analytics cookies for caching middleware purposes

You may notice that using Google Analytics's 'urchin' with the CacheMiddleware and SessionMiddleware or AuthenticationMiddleware middleware classes means that nothing is ever cached. Google Analytics updates its cookies with every page view, and the Auth/Session middlewares add cookies to the caching engine's 'Vary' list. This means every page view is given a unique cache key. This middleware class will remove urchin's '__utmX' cookies from the request object before it hits the caching middleware. Put it at the top of your MIDDLEWARE_CLASSES in settings.py. nf / [email protected]

• middleware
• cache
• google
• analytics

Thu 18 Aug 2011 Read More

hide emails with PIL - template filter

This template filter converts email text to image with the email text. It uses PIL and it makes the image as high and wide as the text. This template filter is intended to be used as **anti-spider** protection.

• email
• mailhide

Sun 11 Jul 2010 Read More

django redirects middleware a bit more fleixble

This is replace for django.contrib.redirects.RedirectFallbackMiddleware which redirects exact matches as well as startswith matches for the redirect.old_path I had a problem with my urls, because are dynamically generic, so I can't create one redirect entry on the database for each possible url. So I made django redirects to search any redirect with the exact match or any database entry being the head of my url, for example: I have django redirects which redirects /calendars/3434/ --> / . But when I have a 404 on /calendars/3434/c/2009/10/23/ now it redirects properly. So my redirects now acts as /calendars/3434/*

• generic
• redirects
• contrib

Sun 11 Jul 2010 Read More

Custom model field for mysql time type.

Django does not have a suitable model field can process time type in mysql, the DateTimeField built-in django can not process more than 24 hours. That's why the code born. **Simply usage** `from myapp.models import TimeAsTimeDeltaField, SECONDS_PER_MIN, SECONDS_PER_HOUR, SECONDS_PER_DAY class EstimatedTime: days = None hours = None minutes = None seconds = None class Case(models.Model): estimated_time = TimeAsTimeDeltaField(null=True, blank=True) def get_estimated_time(self): estimated_time = EstimatedTime() if self.estimated_time: total_seconds = self.estimated_time.seconds + (self.estimated_time.days * SECONDS_PER_DAY) days = total_seconds / SECONDS_PER_DAY hours = total_seconds / SECONDS_PER_HOUR - days * 24 minutes = total_seconds / SECONDS_PER_MIN - hours * 60 - days * 24 * 60 seconds = total_seconds % SECONDS_PER_MIN estimated_time.days = days estimated_time.hours = hours estimated_time.minutes = minutes estimated_time.seconds = seconds return estimated_time else: return estimated_time

• models
• orm
• database
• field
• timedelta

Sun 11 Jul 2010 Read More

middleware for user_passes_test

Middleware to decorate views with user_passes_test in a centralized, url-matching manner. Makes it easy to apply permissions across large sections or all of a site.

• auth
• permissions
• decorators

Sun 11 Jul 2010 Read More

A Lazy ChoiceField implementation

Sometimes it is useful to have a ChoiceField which calculates its choices at runtime, when a new instance of a form containing it, is generated. And this is what `LazyChoiceField` does. The `choices` argument must be an *iterable* as for `ChoiceField`. **Usage example** from django import forms DynamicApplicationList = [] class MyForm(forms.Form): dynamic_choice = LazyChoiceField(choices = DynamicApplicationList) `DynamicApplicationList` can now be updated dynamically.

• fields
• choice
• forms
• form
• field

Sun 11 Jul 2010 Read More

very archive view

I tried to think of a way to use generic views to show all my blog posts on one page organized chronologically with each post title under one month name and all the month names under one year name. Like so: ` 2009 October My last example blog entry Entry even before the last one First of October September Only one entry in Sept. 2008 December It is cold in December First posting of my blog ` I could not think of a way to do this using generic views, before I wrote a view and some template logic that does. The template logic is here: [http://www.djangosnippets.org/snippets/1765/](http://www.djangosnippets.org/snippets/1765/) Any suggestions for design patterns are greatly appreciated.

• archive
• blog-entry

Sun 11 Jul 2010 Read More

very archive template

I tried to think of a way to use generic views to show all my blog posts on one page organized chronologically with each post title under one month name and all the month names under one year name. Like so: ` 2009 October My last example blog entry Entry even before the last one First of October September Only one entry in Sept. 2008 December It is cold in December First posting of my blog ` I could not think of a way to do this using generic views, before I wrote a view and some template logic that does. The view code is here: [http://www.djangosnippets.org/snippets/1766/](http://www.djangosnippets.org/snippets/1766/) Any suggestions for design patterns are greatly appreciated.

• archive
• blog-entry

Sun 11 Jul 2010 Read More

Nice form errors

Nicely output all form errors in one block, using field labels rather than the field attribute names.

• forms
• template-filter
• errors

Fri 29 Apr 2016 Read More

Continuous Integration command

This command, `runtester` will run the test suite whenever files are modified. It takes the apps to test as arguments; if no apps are given the entire test suite is run. Use this command just as `runserver` is used; fire it up in a shell and it does its thing. Copy this snippet into `django/core/management/commands/runtester.py`.

• testing
• tests
• commands
• command
• test-runner

Wed 01 Dec 2010 Read More

invoke pyflakes via manage.py

Invokes [pyflakes](http://divmod.org/trac/wiki/DivmodPyflakes) diagnostic tool as a `manage.py` command. Save as `flakes.py`, since `pyflakes.py` will collide with `pyflakes` module. I needed to invoke pyflakes as management command, because I alter `sys.path` in my `manage.py`, so system-wide pyflakes would not see project-local modules. Provides possibility of ignoring warnings by adding text `pyflakes:ignore` in a comment at end of offending line. Returns non-zero status to system when non-ignored warnings are found. Accepts list of directories or files as arguments. When no arguments are given, `PYFLAKES_DEFAULT_ARGS` setting is used (list of strings, by default `['.']`).

• management
• pyflakes
• flakes

Wed 09 May 2012 Read More

Rails-like environments using Django

This is a replacement for settings.py, which moves the actual settings files into a directory called "env" and establishes different versions for different settings of the environment variable DJANGO_ENV. At runtime, the specified development environment can be found and loaded into the local context of settings.py, which is then picked up by whatever routine manage.py is kicking off.

• django
• rails
• environment

Sun 11 Jul 2010 Read More