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All snippets written in Python

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ModelChoiceField with choice groups for recursive relationships

Note: must call within __init__() method, so you must do self.fields["field"] = ModelChoiseField(...). This is because I did not use a ModelChoiceIterator. A subclass of ModelChoiceField which represents the tree level of each node when generating option labels. It's limited to one level of nesting, if you need more, you should consider the django-mptt package. For example, where a form which used a ModelChoiceField: category = ModelChoiceField(queryset=Category.objects.all()) ...would result in a select with the following options: --------- Root 1 Root 2 Child 1.1 Child 1.2 Child 2.1 Using a NestedModelChoiceField instead: category = NestedModelChoiceField(queryset=Category.objects.all(), related_name='category_set', parent_field='parent_id', label_field='title') ...would result in a select with the following options: Root 1 --- Child 1.1 --- Child 1.2 Root 2 --- Child 2.1

  • ModelChoiceField
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A basic view for working with jQuery dataTables plugin

jQuery dataTables is a fantastic and powerful client-side plugin, which has many capabilities. There are many libraries out there that easily integrate it with django with little to no effort. However, they provide everything out of the box, which isn't always the most flexible solution. I also think beginners have a lot to learn from not using already created tools. So, finding the general examples out there lacking, I though I'd hatch out a quick example of how to very basically integrate the two. I supply two lists at the top which define how to order the fields and which are searchable (quite similar to the one defined in the admin site) and later everything is figured from there. Of course, for a little more complex implementation (say using a method instead of a field) this will not work (since getattr doesn't automatically call a function if it is a function), but this snippet isn't supposed to provide everything but a very basic usage example, which can be very quickly expended in any way needed. Anyway, this snippet should work on all django versions and all dataTables versions without a hitch. last note- I use `cStringIO` with `json.dump` out of good personal experience with that settings, though it might not be the best way to serialize the data. Good luck, share use and enjoy, ~yuvi

  • django
  • dataTables
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Dict Concat

Wanted a simple function to concatenate n dictionaries. Each dictionary passed in is deep copied to avoid any possible mutation of dictionaries being concatenated. Dictionary m's key/values will be overwritten by dictionary m+1's key/values.

  • dict
  • dicts
  • dictionary
  • concat
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Greek uppercase tag for django

Tag to correctly uppercase Greek characters with accent, copy the code in your templatetags folder in a file of your choice, load it in your templates {% load yourfile %} and use it as {% string|gruppercase %} the code works also with other languages, it won't modify anything (eg {% ukwork|gruppercase %} as it transforms only Greek characters (unless your language contains Greek characters).

  • tag
  • django
  • templates
  • uppercase
  • greek
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IntegerRangeField

Django models IntegerField that get max_value and min_value in it's constructor and validate on it. It's initialize the formfield with min_value and max_value, too.

  • models
  • fields
  • IntegerField
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ContentType template filter

Custom template filter to retrieve a content type of a given model instance. Useful for ModelForms which want to set the content_type field (i.e: GenericForeignKey). ### A usage example: {% load helpers %} {% with instance|content_type as ctype %} <input type="hidden" name="content_type" value="{{ ctype.pk }}"> {% endwith %} Original idea from [this stackoverflow answer] [1] [1]: http://stackoverflow.com/a/12807458/484127

  • template
  • filter
  • tag
  • contenttypes
  • contenttype
  • GenericForeignKey
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Inherit the standard url tag to include domain name

This module extends the standard `url' template tag in Django and adds support for fully qualified domain name URLs. It also can be extended with simple URL load balancing techniques if desired. See my blog for the background story: <http://atodorov.org/blog/2013/12/22/django-template-tag-inheritance-howto/>

  • template
  • tag
  • templatetag
  • url
  • inheritance
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Multiple emails form field

Validate form field that include email or emails separated by 'token' kwargs, by default ',' a comma. Return a list [] of email(s). Check validity of the email(s) from django EmailField regex (tested with 1.3, but normally will also work with 1.5)

  • multiple
  • email
  • validation
  • form
  • field
  • list
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Lazy context processor.

Sometimes you have context variables that are needed on many pages in a site, but not all. You only want them to be evaluated when actually needed, especially if they are expensive calculations that do DB queries etc. The pattern to use is shown: put a callable into the context, not the final value, and also wrap the callable with memoize_nullary.

  • template
  • contextprocessor
  • lazy
  • context-processor
  • memoize
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Decorator to execute a method only once

Beware if using Amazon Simple Queue Service to execute Celery tasks which send email messages! Sometimes SQS messages are duplicated which results in multiple copies of the messages being sent. This is a simple decorator which uses a cache backend to prevent the task from executing twice in a specified period. For example: @task @execute_once_in(3600*24*7) def cron_first_week_follow_up(): """ Send a follow-up email to new users! """ pass For more info see <http://atodorov.org/blog/2013/12/06/duplicate-amazon-sqs-messages-cause-multiple-emails/> <http://atodorov.org/blog/2013/12/11/idempotent-django-email-sender-with-amazon-sqs-and-memcache/>

  • django
  • email
  • decorator
  • amazon
  • queue
  • celery
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View all log entries in the admin 2

Based on: [View all log entries in the admin](https://djangosnippets.org/snippets/2484/) Improvements: * No crash on `object_link` when reverse route missing, * Filter by users present in the log AND in database currently * Other filters on users - only superusers / only staff (modify to fit your needs) EDIT: Incorporated `action_description` from [django-logentry-admin](https://github.com/yprez/django-logentry-admin). * The list filter now has human-friendly action names, and the table also. * Refactored list filter class hierarchy.

  • admin
  • list-filter
  • logentry
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