Pull ID from arbitrary sequence

Django does not currently allow one to pull ID values from arbitrarily named sequences. For example, if you did not create your ID column using the serial data type in PostgreSQL, you likely will not be able to use your sequences. This is quite a problem for those integrating with legacy databases. While ultimately the best place to fix this is django proper, this decorator will help people get by for now. Note that in this case, all of my sequences are named "pk_TABLENAME". You'll likely have a different convention and should update the decorator appropriately. While I could have made the pattern a parameter, it didn't seem like that would gain much here.

• database
• sequence
• postgresql

Sun 11 Jul 2010 Read More

Case-insensitive lookup by default

I wanted lookups on tags to be case insensitive by default, so that things like Tag.objects.get(name='Tag') would return any similar tags (ignoring case differences), i.e. `<Tag: tag>`. This snippet makes lookup on the 'name' field case-insensitive by default, although case-sensitive lookups can still be achieved with 'name__exact'. Methods like get_or_create will work as expected and be case-insensitive.

• model
• tags
• tagging
• manager
• case-insensitive
• iexact
• queryset

Sun 11 Jul 2010 Read More

Inspect object debugging tag

Simple template tag that allows you to inspect an object in the context for debugging. It will inspect django models and forms using introspection. Dicts and lists are formatted to truncate long data. Pretty much everything else just displays the __str__ representation + class name. Example output: http://dsanity.net/introspectiontag.html Usage: put tag code as file introspection.py in your templatetags directory. Place the html template in your template path under "inspect_object.html". Then in your template: {% load introspection %} {% inspect_object obj "test object" %} The first parameter is the object to inspect, the second is the name used for display purposes.

• tag
• debug
• debugging
• introspection

Sun 11 Jul 2010 Read More

Middleware that fixes URLs generation for admin and {% url %} for SCGI and WSGI

This middleware fixes generation of URLs for admin interface and {% url %} resolving when you're mounting application to the subtree of site, e.g. if you use SCGIMount /prefix/ and serve application using SCGI, or if you use WSGI and want to bind Django application to some prefix.

• middleware
• url
• relative

Sun 11 Jul 2010 Read More

Regular Expression Dictionary

Cute little dictionary-like object that stores keys as regexs and looks up items using regex matches. It actually came in handy for a project where keys were regexes on URLs.

• regex
• re
• dict

Sun 11 Jul 2010 Read More

Partial OpenID provider implementation from idproxy.net

Lots of people have asked me when the [django-openid](http://code.google.com/p/django-openid/) package will provide tools for running an OpenID provider (in addition to an OpenID consumer). The answer is "when it's done", but since it's such a common request I've decided to post some example code to help people who want to work it out for themselves. This is the openidserver.py file from [idproxy.net](http://idproxy.net/). It is **incomplete** - the urlconf, models, templates and some utility functions are not included. In other words, it's useless for anything other than providing a few hints as to how you can go about implementing a provider. Nonetheless, it's better than nothing. I hope this will prove a useful example for people trying to figure out how to best integrate the JanRain Python OpenID library with Django to build an OpenID provider.

• openid
• incomplete
• partial

Sun 11 Jul 2010 Read More

nofollow filter

This filter add extra attribute **rel="nofollow"** to any "<a ..." element in the value, which does not contain it already. I use this to filter comments text in my blog.

• filter

Sun 11 Jul 2010 Read More

MetaOptions

A class called MetaOptions that enables decoration of Django models with meta classes in similar style to Admin and Meta. Included is an example usage to enable CSV export of any set of models. The package installs into django.contrib.options and is available for download at the [Python Cheeseshop](http://cheeseshop.python.org/pypi/django_options/r6)

• csv
• options
• meta

Sun 11 Jul 2010 Read More

Binding pre-existing tables with dynamically created class models

This snippet proposes a solution for pre-exisiting database tables that have no counterpart in your django application models.py module. My use case was a comercial systems where pricing tables were created on-the-fly as a result of a stored procedure's execution inside the database. These pricing tables had no counterpart class model. Therefore, to access these tables from Python code you had to bypass Django's ORM and use plain-old SQL through cursos.execute(). This snippet's strategy is to create a (model) class on the fly and inject that class inside models.py namespace. After that you can use the generated class and Django's ORM machinery to access the tables, as if they were created by syncdb.

• orm
• dynamic-model

Sun 11 Jul 2010 Read More

friendly timer display of seconds like 01:03:34

l = (1, 23, 60, 75, 3600, 36000) for n in l: print friendly_seconds(n) 00:00:01 00:00:23 00:01:00 00:01:15 01:00:00 10:00:00

• filter
• time
• seconds

Sun 11 Jul 2010 Read More

Random code tag

This tag solves for me a simple need: generate random and compact codes for some of my applications. Codes are not guaranteed to be unique. **Usage** {% randomCode "num" %} **Example**: {% randomCode "8" %} generates a random 8 characters code. Create a file on your favorite template tags folder called randomcode.py and paste the code. Don't forget to include {% load randomcode %} in your templates

• tag

Sun 11 Jul 2010 Read More

BabelMiddleware

Originally posted on [skam.webfactional.com](http://skam.webfactional.com/blog/2007/07/16/babel-integration-django/) This is a very simple middleware that uses babel (http://babel.edgewall.org) for accessing locale data in request objects through request.LOCALE attribute. It also provides a function to get locale data outside views. settings.py: MIDDLEWARE_CLASSES = ( ... cut ... 'django.middleware.locale.LocaleMiddleware', 'middleware.locale.BabelMiddleware', ... cut ... )

• middleware
• i18n
• l10n
• locale
• babel

Sun 11 Jul 2010 Read More

DefaultValueWidget

Can be used if a form field should not be editable, but the current value or the value that will be automatically used should still be visible to the user. __init__ takes two additional parameters: **value** is the actual value to be used when saving the form, while **display** determines what is shown to the user when rendering. If *display* is not specified, *value* itself will be used instead. If *display* is a *ModelChoiceField*, *value* is assumed to be a primary key of the model, and the widget will automatically try to retrieve and use the string representation of the corresponding item.

• newforms
• forms
• widgets
• widget

Sun 11 Jul 2010 Read More

"Approved" field with timestamp

I wanted to make the objects of a particular model approvable and store the timestamp of when that happened. In other frameworks/languages, I used to combined those in one "approved_at" field, which would be NULL if an object was currently unapproved. I tried different approaches to implement this in django, and this is the best I came up with so far. Basically, the code in __setattr__ makes sure that the field, once set, will not be updated again. Overriding setattr__() could also be a solution to determining if a field value has changed in save(), a question that seems come up from time to time in #django.

• newforms
• models
• fields
• forms
• save

Sun 11 Jul 2010 Read More

Multiple models display form

You have an update form with many fields and want to populate it with data coming from multiple models.

• form

Sun 11 Jul 2010 Read More