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All snippets written in Python

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Accept Header Middleware

A middleware that parses the HTTP_ACCEPT header of a request. The request gets a new method called "accepts" that takes a string and returns True if it was in the list of accepted mime-types. It makes it possible to write views like: def exampleview(request): if request.accepts('application/json'): # return a json representation if request.accepts('text/html'): # return html Please note that with this middleware the view defines the priority of the mime-types, not the order in which they where provided in the HTTP-Header.

  • middleware
  • request
  • accept
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Google Contacts API friend finder

This view will provide a link for AuthSub proxy authentication to the Google Contacts API and then grab the user's Google contacts and compare against User.email for possible user relationships. A couple of things to note: * Dependency on the GData Python client library: http://code.google.com/p/gdata-python-client/ * The domain hosting the view must be verified by Google's domain manager (otherwise API calls will result in a 403): https://www.google.com/accounts/ManageDomains Thanks to Simon for get_url_host and get_full_url.

  • api
  • gmail
  • google
  • gdata
  • contacts
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Auto HTML Linebreak filter

This custom filter is helpful if you want to convert plain text to include html line breaks but you aren't sure if the text is actually plain text or if it already contains html line breaks. First the filter looks for if the text contains any br, p, or table tags, if it does the text is returned as is. If it doesn't then the same functionality as the [linebreaks](http://www.djangoproject.com/documentation/templates/#linebreaks) filter is applied to the text.

  • filter
  • html
  • linebreaks
  • custom-filter
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newforms-admin edit callback-url hook

NOTE: this is for **newforms-admin** I need edit links for items on my site, outside of the django admin -- however, I'm lazy, and don't want to build my own edit forms when there's a perfectly nice admin already there. Trick is, I need to be able to click a link to the django admin edit page for an item, and have it return to the calling page after saving. This chunk of code does the trick (the "real" version extra cruft, naturally) -- the links will bring up the django admin editor, then return to the calling page after saving.

  • newforms
  • admin
  • url
  • newforms-admin
  • newformsadmin
  • edit
  • callback
  • hook
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Resize image on save

This snippet is extracted from my Photo model. I use it to ensure that any uploaded image is constrained to a specified size (resized on save). In my case, I don't need to maintain a "thumbnail" and "fullsize" version, so I just store the resized version to save space.

  • image
  • pil
  • resize
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Set test cookie unless logged in

This allows you to use a quick login forms outside of the django.contrib.auth.views.login view, the cookie will be deleted once you login.

  • middleware
  • cookie
  • login
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PHP's number_format like template filter

This filter allows you to format numbers like PHP's [number_format](http://php.net/number_format) function. If `var` equals 1234.567`{{ var|number_format:2 }}` produces 1,234.56. Because Django's template filters support just 1 argument you'll have to adjust the argument's default values by hand until [#1199](http://code.djangoproject.com/ticket/1199) is fixed.

  • filter
  • number_format
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Choices datatype for model

This class will automatically create a django choices tuple like this: STATUS_CHOICES = django_choices(Draft=1, Public=2, Closed=3) Additionally, it includes a method that converts the choices tuple to a dictionary. Like this: STATUS = STATUS_CHOICES.to_dict() Those types can come in handy when you need to use those magic values in your code. Best done within the model once so everyone can use it. Code based on: http://www.djangosnippets.org/snippets/455/. By the way, if you want to just have the method without having to convert to the newer syntax.. it's backward compatible. Just add django_choices in front of the first paren for your choices tuple.

  • choices
  • model
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FormMail Clone

A quickie clone of good old fashion [Formmail.pl](http://www.scriptarchive.com/formmail.html) any form that is a subclass of FormMail will have its conents emailed to all staff members on the site.

  • newforms
  • email
  • formmail
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dumpdata/loaddata with MySQL and ForeignKeys (Revision 2)

nnoDB 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 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
  • fixtures
  • dumpdata
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Alternative to User.get_profile()

**This is an alternative to User.get_profile.** Rather than having you call `User.get_profile` directly, this retrieves the profile instance for a `User` and attaches the fields from the profile to the `User` object when instantiated. The special methods for `DateField`, `FileField`, `ImageField` and fields with `choices` are also created. Since the profile object still has to be retrieved from the database before its fields can be added to the `User`, the costs for using this might outweigh the rewards unless you are heavily using profiles. To install, place it in a module on your `PYTHONPATH` and add it to `INSTALLED_APPS`.

  • user
  • profile
  • auth
  • userprofile
  • profiles
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CustomChoiceField, Selectable label field version of ModelChoiceField

**The problem** ModelChoiceField always uses __unicode__ or __str__ to fill the labels. I needed to dynamically select which field to use for the labels. **The solution** My approach copies a lot from [this blog](http://oebfare.com/blog/2008/feb/23/overriding-modelchoicefield-labels/) with some modifications to make it more dynamic. There are some proposals to fix on this [Ticket #4620]( http://code.djangoproject.com/ticket/4620) **How to use** Include the code on your forms.py (or whatever you are using) and use the CustomChoiceField with the extra argument label_field instead of ModelChoiceField. Hope it helps someone.

  • newforms
  • forms
  • modelchoicefield
  • modelform
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Updated FileField / ImageField with a delete checkbox

Example model: class MyModel(models.Model): file = RemovableFileField(upload_to='files', \ null=True, blank=True) image = RemovableImageField(upload_to='images', \ null=True, blank=True) A delete checkbox will be automatically rendered when using ModelForm or editing it using form_for_instance. Also, the filename or the image will be displayed below the form field. You can edit the render method of the DeleteCheckboxWidget or add one to RemovableFileFormWidget to customize the rendering. UPDATE: 5. April 2009. Making it work with latest Django (thanks for the comments).

  • newforms
  • models
  • imagefield
  • filefield
  • remove
  • delete
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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
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