register.tag as a class decorator

Defining a custom template tag consists of three parts: a compiling function, a rendering `Node` subclass and a tag registration with `register.tag()`. The latter can be used as a (function) decorator on the compiling function, simplifying things into two parts. A neat fact is that `register.tag()` can actually be used as a class decorator in Python 2.6+ to condense all steps into the `Node` subclass. The compiling function simply becomes the `__init__()`. Below are two variants of the 'current_time' tag example from the Django docs: the first passing an explicit tag name and the second using the class name instead.

• template-tags
• class-decorator

Sun 11 Jul 2010 Read More

Unzip a .zip file uploaded with FileBrowser

Django Filebrowser (http://code.google.com/p/django-filebrowser/) provides a signal called filebrowser_post_upload. Adding this method to a model that has a FileBrowse field will cause uploaded .zip files to be detected and unzipped on the server in place, then deleted (leaving their folder behind). It will also delete the garbage __MACOSX folder created by Mac zip files. This is probably not safe to do for publicly uploaded files. The use case here was to allow journalists to upload entire SoundSlides projects into a custom CMS.

• filebrowser
• zip
• unzip

Thu 06 Feb 2014 Read More

Model Choices Helper

This is my attempt at a convenience class for Django model choices which will use a [Small]IntegerField for storage. It's very similar to [jacobian's version](http://www.djangosnippets.org/snippets/1664/), but I wanted to be able to use simple attributes for access to the integer values. It's not technically dependent on Django, but it's probably not a datatype that would be useful for much else. Feel free to do so however if you have a use-case. >>> statuses = Choices( ... ('live', 'Live'), ... ('draft', 'Draft'), ... ('hidden', 'Not Live'), ... ) >>> statuses.live 0 >>> statuses.hidden 2 >>> statuses.get_choices() ((0, 'Live'), (1, 'Draft'), (2, 'Not Live')) This is then useful for use in a model field with the choices attribute. >>> from django.db import models >>> class Entry(models.Model): ... STATUSES = Choices( ... ('live', 'Live'), ... ('draft', 'Draft'), ... ('hidden', 'Not Live'), ... ) ... status = models.SmallIntegerField(choices=STATUSES.get_choices(), ... default=STATUSES.live) It's also useful later when you need to filter by your choices. >>> live_entries = Entry.objects.filter(status=Entries.STATUSES.live)

• django
• models
• choices

Sun 11 Jul 2010 Read More

Reliably create a Django File using the contents of a URL

There's no direct way to save the contents of a URL to a Django File field: you're required to use a File instance but those can only safely wrap normal files, not the file-like object returned by urllib2.urlopen. Several examples online use urllib.urlretrieve() which creates a temporary file but performs no error handling without writing a ton of hackish code. This demonstrates how to create a NamedTemporaryFile, fill it with the URL contents and save it, all using APIs which raise exceptions on errors.

• url
• filefield
• file
• urlopen

Sat 21 Jun 2014 Read More

Amazon product-data interface class for Django-friendly PyAWS queries

I am not sure what to say about the state of PyAWS, or its future, what with the multiple forks available and lack of recent updates. The best version I've found is [http://github.com/IanLewis/pyaws](this one), a spiffed-up version of 0.2.2 by Ian Lewis. I wrote this class on top of PyAWS so I could have more pythonic/django-y calling conventions, and to isolate the calls in case I have to swap libraries or versions down the road. You may want to familiarize yourself with PyAWS before using this. You'll definately need Amazon web service login credentials and keys -- they're available [here](http://aws.amazon.com/) for free. personally I use it with [these monkeypatching and decorator-decorators](http://www.djangosnippets.org/snippets/1888/) -- at the top of my personal version of the file containing this snippet I use the two (non-silly) examples from that snippet, to make the PyAWS internal Bag collection class work for me. EXAMPLE USE: # search Amazon's product database (returns a list of nested dicts) from amazon import aws books = aws.search(q='raymond carver') lenses = aws.search(q='leica summicron', idx='Photo') # get the data for a specific ASIN/ISBN/EAN/etc ID number what_we_talk_about_when_we_talk_about_love = aws.fetch(qid='0679723056', idtype='ASIN')

• decorator
• amazon
• amazonapi
• aws
• pyaws

Sun 11 Jul 2010 Read More

decorators for creating paramaterized decorators and easy monkeypatching

as with all things related to monkeypatching, the caveat is to use things like these for good, and not for evil. I wrote these decorators because I did not want to rewrite all of [PyAWS](http://github.com/IanLewis/pyaws) -- instead I use these to add some standard/useful methods to the Bag collection that PyAWS uses internally. AN EXAMPLE: class PatchMyMonkey: pass @monkeypatch(PatchMyMonkey) def throwfecesat(self, who="nobody"): print "Throwing Feces At: %s" % who @monkeypatch(PatchMyMonkey) def nicoderm(self, why="no reason"): print "Trying To Quit Because: %s" % why return {'why':str(why)} trampstamp = PatchMyMonkey() trampstamp.throwfecesat(who="another monkey") print trampstamp.nicoderm(why="cigarettes are pricey") A LESS SILLY EXAMPLE: from pyaws import ecs @monkeypatch(ecs.Bag, fname='get') def get(self, param, *args, **kw): return self.__dict__.get(param, *args, **kw) @monkeypatch(ecs.Bag, fname='clearurls') def clearurls(self, *args, **kw): for k, v in self.__dict__.items(): if isinstance(self.__dict__[k], ecs.Bag): self.__dict__[k].clearurls(*args, **kw) if type(v) == type([]): [ii.clearurls() for ii in self.__dict__[k]] if type(v) == type(u''): if self.__dict__[k].count(u'http://') > 0: self.__dict__[k] = "<URL>" (amazon's URLs are extremely long, and can muddle your test/log output, hence that last function.) based on sample code from [here](http://pypi.python.org/pypi/decorator) and [here](http://mail.python.org/pipermail/python-dev/2008-January/076194.html).

• decorator
• monkeypatch
• decoratordecorator
• functionalprogramming
• usewithcare

Sun 11 Jul 2010 Read More

Updated Filter to resize a ImageField on demand (ver.2)

An update to snippet 1718 (http://www.djangosnippets.org/snippets/1718/). This update lets you pass an image URL string as well as a model ImageField instance. This means that you can then create thumbnails on demand for images outside of model

• image
• templatetag
• thumbnail
• resize
• imagefield

Sun 11 Jul 2010 Read More

showing environment variables in the django admin

Having things like DATABASE_NAME in the admin interface is handy if you're working on development and deployment systems. Replace the template admin/base_site.html with the template code. The variables to be displayed in the admin need to be exported into the environment before running the server. The python code shown is an example of a wsgi handler, and the same format can be used in manage.py for the development server.

• admin

Fri 09 Sep 2011 Read More

Anticollate? Disinterleave?

This is yet another partitioning filter, but I wanted to be able to distribute my objects across two columns, and have them read from left to right, top to bottom. So if n = 2 this would return every other object from a queryset. With gratitude to the author of snippet 6.

• filter
• partitioning
• every-other

Sun 11 Jul 2010 Read More

Fieldsets for Views

This Snippet allows a view to controle the printed forms on the templates, in a similar way to the fieldsets used by the django admin. How to Use: In the view in question, put: def some_view(request): ... fieldsets = ( (u'Title 1', {'hidden' : ('field_1', 'field_2',), 'fields' : ('field_3',)}), (u'Title 2', {'hidden' : ('field_5', 'field_6',), 'fields' : ('field_4',)}),) ) return render_to_response('some.html', {'fieldsets': fieldsets}) fieldsets = ( (None, {'hidden' : ('evento', 'colaborador',), 'fields' : ('acompanhantes',)}), ) Next, in the html just add: <form enctype="multipart/form-data" id="edit" method="post" ...> ... {% include "inc/form_snippet.html" %} ... <input type="submit" value="Submit"> </form>

• template
• django
• admin
• views
• filters
• python
• tags
• html
• css
• dicts

Sun 11 Jul 2010 Read More

Admin Apps Names Translation

This Snippet allows for your project's apps names to be displayed as you want in the Admin, including translations. The lists of apps and languages are created from your settings.py file. **How to use** 1st part: - Create a application called 'apps_verbose' in you project with the models.py and admin.py showed here - Create a folder inside it with named 'templatetags' with the verbose_tags.py file inside it. - Add this app to installed apps in your settings.py - If you change this app name, dont forget to correct the imports. 2nd part: - Create a folder named 'admin' in your templates folder and copy the following files form your /django/contrib/admin/templates/admin/ folder. - /app_index.html - /base.html - /change_form.html - /change_list.html - /delete_confirmation.html - /delete_selected_confirmation.html - /index.html - /object_history.html - Make the necessary changes in each file, like shown here. 3rd part: - Create translations in the Admin and enjoy.

• template
• django
• admin
• i18n
• python
• tags
• html
• app
• translation

Sun 29 Jul 2012 Read More

Remember me for login

Set session to never expire in settings, and when remember_me is found false in login POST, set it to browser session expiry. Works only in Django 1+.

• views
• python
• login
• rememberme

Mon 16 Jun 2014 Read More

Simple Paginator Function

This is very simple Paginator function built over Django's Paginator. Just pass following:- 1. request object 2. object list - This is a list of object you want to paginate 3. per page - how many items you need per_page 4. paginator_range - Specify how many links you want on either side of current page link. Refer to Paginator reference [here](http://docs.djangoproject.com/en/dev/topics/pagination/)

• paginator
• page-range

Sun 11 Jul 2010 Read More

Compact list_filter

When doing a list_filter on some object in the Django interface, every single item will be displayed. This is not always smart when very long list of choices can be displayed, even though the majority of these choices might not even exist in the database at all. Using this script will only display a filtering possibility for those items actually present in the database. This script is not generic, and you will need to change the lines noted "Change this", since I cannot know what exactly you need to filter. There is possibly a way to make this completely generic, and I hope this will inspire someone to make it!

• admin-interface
• compact
• list_filter

Wed 16 Feb 2011 Read More

Form field sets

Create form atribute(s) for grouping (bound) fields.

• forms
• fieldsets

Mon 12 May 2014 Read More