Q marshaller

Django supports the serializing model objects, but does not support the serializing Q object like that, ============================ q = Q(username__contains="findme") model0.objects.filter(q) serialize(q) # X ============================ so I wrote a little marshaller for Q, this is example, ============================ from django.contrib.auth import models as django_models qs = django_query.Q(username__contains="spike") | django_query.Q(email__contains="spike") _m = QMarshaller() a = _m.dumps(qs) # a was serialized. When call the similiar queries in page by page, you don't need to write additional code for creating same Q(s) for filtering models, just use the serialized Q as http querystring and in the next page unserialize and apply it. That is simple life.

• model
• python
• q
• query

Sun 11 Jul 2010 Read More

Mask sensitive POST fields in error e-mails

For PyCon we have our crash messages go to a mailman group so that people working on the site would be aware of issues. This saved us many times. But sensitive information would some times come up such as login passwords and fields we did not want going on the list. the solution was to mask these POST fields when an exception occurs and is being handled. This is simple drop-in code which will mask the values of POST arguments which contain keywords (such as 'password', 'protected', and 'private').

• exception
• handler

Sun 11 Jul 2010 Read More

smart spaceless

Just like `{% spaceless %}`, except a single space is preserved between two inline tags (such as `<a>`, `<em>`, and so on). This lets you use the tag on running text without fear of running two spans of styled text together incorrectly.

• tag
• spaceless

Wed 06 Oct 2010 Read More

Navigation list from YAML file

Tag to generate a navigation list from a YAML file. Generates a series of divs but to be more semantically correct could do a ul or dl.

• tag
• navigation
• yaml

Sun 11 Jul 2010 Read More

Cached lookup model mixin

This mixin is intended for small lookup-style models that contain mostly static data and referenced by foreign keys from many other places. A good example is a list of Payment options in an e-shop that is referenced from Orders and is hitting database `order.payment` at least one time for an order. The idea is to cache entire table in a dict in memory that will live for entire life of a whole process serving many requests. The downside is that you need to restart the server when a cached lookup table changes.

• foreignkey
• cache
• lookup
• parent

Sun 11 Jul 2010 Read More

Stop tests at the first failure

**Note**: The `--failfast` argument in Django since version 1.2 does this. Use this snippet for earlier versions. If a large number of your unit tests get "out of sync", it's often annoying to scan through a large number of test failures which overflow the terminal window's scroll buffer. This library strictly stops after the first failure in a doctest suite. If you're testing multiple applications, it also stops after the first test suite with failures in it. So effectively you'll get one failure at a time. This code has been tested with doctests only so far. You can also fetch the latest source from [my repository](http://trac.ambitone.com/ambidjangolib/browser/trunk/test/).

• testing
• unittest

Thu 19 Aug 2010 Read More

dumpdata/loaddata with MySQL and ForeignKeys

InnoDB tables within MySQL have no ability to defer reference checking until after a transaction is complete. This prevents most dumpdata/loaddata cycles unless the dump order falls so that referenced models are dumped before models that depend on them. This code uses [Ofer Faigon's](http://www.bitformation.com) topological sort to sort the models so that any models with a ForeignKey relationship are dumped after the models they reference. class Entry(models.Model): txt = .... class Comment(models.Model): entry = models.ForeignKey(Entry) This code will ensure that Entry always gets dumped before Comment. Fixtures are an important part of the django Unit Testing framework so I really needed to be able to test my more complicated models. **Caveats** 1. You use this snippet to dump the data and the built in manage.py loaddata to load the fixture output by this program. A similar solution could be applied to the XML processing on the loaddata side but this sufficed for my situations. 2. This code does not handle Circular or self-references. The loaddata for those needs to be much smarter.

• mysql
• loaddata
• foreign-key
• fixture
• dumpdata

Sun 11 Jul 2010 Read More

another render_to_response wrapper

Wrapper for render_to_response that allows you to pass in a optional preinitialized HttpResponse object. Helpful when you want to want to set cookies or just add some extra initialization to your HttpResponse. If no HttpResponse is passed in the normal render_to_response is called. It's called exactly like the normal render_to_response except that you can pass in a kwargs response pair if you wish. Like so: code render_response('index.html',{'aparam': val}, context_instance=RequestContext(request),response=my_response)

Sun 11 Jul 2010 Read More

Authenticate against a Windows domain controller

To activate, store this file as `mysite/winauth.py` and use in settings.conf: AUTHENTICATION_BACKENDS = ('mysite.winauth.DomainControllerAuthBackend',) Needs [pywin32 extensions](http://sourceforge.net/projects/pywin32/) installed (and obviously only runs on Windows).

• authentication
• domain
• windows
• controller
• pdc

Sat 21 Aug 2010 Read More

lazy url reverse()

Since the decorators of your views are evaluated during parsing urls.py you have an 'chicken - egg' problem. The method reverse() can't be used since urls.py is not read. This snippets evaluates reverse() lazy. [Related ticket: 5925](http://code.djangoproject.com/ticket/5925) Django 1.4 (current trunk) has a lazy reverse.

• decorator
• reverse
• lazy

Thu 03 Nov 2011 Read More

Pattern to integer list function

This function can be util for transform pattern strings like these to list: >>> pattern_to_list('42-45') [42, 43, 44, 45] >>> pattern_to_list('15,49-52') [15, 49, 50, 51, 52] >>> pattern_to_list('0-13') [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13] You can use also the list to pattern function at [http://www.djangosnippets.org/snippets/496/](http://www.djangosnippets.org/snippets/496/)

• list
• integer

Sun 11 Jul 2010 Read More

Renderer decorator

You can use this as a decorator for your views, this way you can return a simple dictionary and the decorator will do the rest. **@TODO:** Automatically set the template based on the app/view request

• shortcut
• render

Sun 11 Jul 2010 Read More

Clouds Tag

This is a simple template tag to create Tag Clouds. Based on the number of Posts (change the model_name according to your schema), Tags are provided different size ( most number of posts => most popular => and hence the largest. We create a property called cloudsize for each tag, which is an integer between minsize and maxsize.

• tag
• template-tag
• tagging
• clouds
• cloud

Sun 11 Jul 2010 Read More

Manager for something like __inall

Provides the method from_related_ids, which lets you select some objects by providing a list of related ids (The huge difference to __in is that the objects have to match al of the ids, not only one) Model Example:: class Article(models.Model): text = models.TextField() tags = ManyToManyField('Tag') objects = AllInManager() Usage:: Article.objects.from_related_ids((1,2,3,4), 'tags')

• model
• db
• manager

Sun 11 Jul 2010 Read More

Sessions and authentication without cookies

[The Session documentation](http://www.djangoproject.com/documentation/sessions/) rightly warns of the dangers of putting a session ID into a query string. Sometimes, however, you have to do it - perhaps your client has mandated support for browsers with cookies disabled, or perhaps (as in my case) you're just dealing with a slightly broken client browser. This middleware pulls a session ID out of the query string an inserts it into the cookies collection. You'll need to include it in your MIDDLEWARE_CLASSES tuple in settings.py, *before* the SessionMiddleware. *Please* read my [full blog post](http://www.stereoplex.com/two-voices/cookieless-django-sessions-and-authentication-without-cookies) about for the dangers of doing this, and for full instructions and examples.

• middleware
• cookie
• session
• authentication
• string
• query
• cookieless
• querystring

Sun 11 Jul 2010 Read More