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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
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Mako support as decorator

This snippet allows you to use @mako("templatename.mako") to define a mako template to use. Your python method just has to return a dictionary that will be passed to mako's context, after the addition of the "request" variable to the dictionary. If you return a non-False non dictionary object, it will return that instead of trying to render the template. The **request** variable is automatically added to the template's context. It also searches the current application's mako_templates/ subdirectory first before searching under the current directories mako_templates/, and does not use other application's mako_templates/ subdirectories at all. On Mako exceptions, it will display the Mako error page when debugging is enabled (hoping for extensible exception handling in the future to keep consistency) I got the idea from a [CherryPy tool](http://tools.cherrypy.org/wiki/Mako).

  • mako
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Author: rmt
  • 2
  • 2

Copy/Paste form generation

Generator to help make newforms classes a bit like inspectdb does for generating rough model code. This is a standalone script to go in your project directory with settings.py and called from the prompt. It looks up the model, and generates code to copy/paste into your app. Hopefully to make a building a custom form with a lot of fields a little easier. Every argument should be a model identifier of form appname.modelname. Usage from the command line: python form_gen myapp.MyModel myapp.MyOtherModel

  • form
  • copy
  • generator
  • paste
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ingore_fields

I use this snippet when creating newforms with form_for_model and form_for_instance. Both do not have an argument that lets you filter out fields easily so I wrote this instead. Typical use: `form_class = form_for_instance(obj, fields=ignore_fields(model_class, ['field_name1']))`

  • newforms
  • fields
  • ignore
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Handling choices the right way

This solves the problem with **choices** described [here](http://www.b-list.org/weblog/2007/nov/02/handle-choices-right-way/) Define your choices like this (in models.py): statuses = MyChoices(BIDDING_STARTED=10, BIDDING_ENDED=20) And then: status = models.IntegerField( default=statuses.BIDDING_STARTED, choices=statuses.get_choices() )

  • models
  • admin
  • choices
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Pagination for date-based views

Date-based generic views do not provide pagination by default but Django is very extensible. It provides a Paginator that takes care of pagination. Since date based views usually order by descending order ie from latest entry to the oldest, I used a queryset to order the items (on a field called 'date_pub') and then pass this queryset to the paginator which takes care of the pagination.

  • views
  • date
  • pagination
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UPDATED: Django Image Thumbnail Filter

A Django image thumbnail filter, adapted from code by [Batiste Bieler](http://batiste.dosimple.ch/blog/2007-05-13-1/). This updated version drops support for cropping and just rescales. You should use it in your templates like this: `<img src='{{ MEDIA_URL }}{{ image.get_image_filename|thumbnail:"300w,listingimages" }}' alt="{{ image.title }}" title="{{ image.title }}" />` This will produce a 300-pixel wide thumbnail of image, with the height scaled appropriately to keep the same image aspect ratio. 'listingimages' is the path under your MEDIA_ROOT that the image lives in - it'll be whatever upload_to is set to in your ImageField. If instead you wanted an image scaled to a maximum height of 140px, you'd use something like this: `<img src='{{ MEDIA_URL }}{{ image.get_image_filename|thumbnail:"140h,listingimages" }}' alt="{{ image.title }}" title="{{ image.title }}" />` Note the number has changed from 300 to 140, and the trailing letter from 'w' to 'h'. Please leave feedback and bug reports on [my blog, Stereoplex](http://www.stereoplex.com/two-voices/a-django-image-thumbnail-filter). I've only lightly tested this so you'll probably find something!

  • filter
  • image
  • thumbnail
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Partial JSON template rendering

this decorator will render template and encode it as JSON string if it find **ajax_request** variable in GET. It will not parse parent (extended) templates, only given template and nested (included). Only blocks will be rendered and encoded to JSON naming block__*BLOCKNAME*. Simple javascript can do ajax request adding *?ajax_request* or *&ajax_request* (if needed) and update given html elements if they id's are same as block__*BLOCKNAME*. you can find a full code (including javascript) at my (http://projects.barbuza.info/trac/browser/django_addons/django_ajax/trunk/ sandbox).

  • ajax
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PyCrust Shell

I thought it would be a neat idea to use the PyCrust shell for interacting with my models, instead of using the plain old shell. So what I did, is take a copy of the file: django/core/management/commands/shell.py Altered it, and saved it as: django/core/management/commands/pycrust.py For this to work, you should have pycrust installed (python-wxtools in ubuntu) and save this snippet as django/core/management/commands/pycrust.py, then run as follows: ./manage.py pycrust instead of ./manage.py shell Have fun!

  • pycrust
  • shell
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Auto Logout Middleware

This Middleware is to log users out after a certain amount of time has passed. You'll want to add AUTO_LOGOUT_DELAY to your settings.py, set to a number of minutes after which a user should be logged out. It adds the key 'last_touch' to the session, you'll want to change that if you happen to be using that already.

  • middleware
  • auth
  • logout
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xmlrpc basic auth

decorator which performs basic http auth authentication against the known userbase. This decorator is only for xml-rpc services. When there is no basic auth a proper response will be returned

  • auth
  • xmlrpc
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Template tag: Extend with parameters

Extended extends tag that supports passing parameters, which will be made available in the context of the extended template (and all the way up the hierarchy). It wraps around the orginal extends tag, to avoid code duplication, and to not miss out on possible future django enhancements. Note: The current implementation will override variables passed from your view, too, so be careful. Some of the argument parsing code is based on: http://www.djangosnippets.org/snippets/11/ Examples: {% xextends "some.html" %} {% xextends "some.html" with title="title1" %} {% xextends "some.html" with title="title2"|capfirst %}

  • template
  • templatetag
  • extends
  • parameters
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Bulk Insert - updated 5/9/2008

This Update adds requested support for self referential fields. This is useful if you need to compute and store potentially hundreds or thousands of objects and relationships quickly. To perform the inserts it will hit the database 1 plus N/100 times per affected table and where N is the number of rows to be inserted. It will use INSERT or LOAD DATA INFILE on MySQL. Run this on your test database first and make sure all of your field defaults and null values are set appropriately as you could attempt to insert a NULL where it isn't allowed and end up with a partial insert. This code is reasonably well tested and has been used for database pre-loading and operations on live sites. My test suite, however, is focused on my own use cases. Any input, i.e. failures, for creating more tests would be appreciated. Lots of Details in the Doc String. Currently only MySQL, however there is some crude skeleton code to support other databases.

  • mysql
  • bulk
  • insert
  • load-data
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