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CheckboxSelectMultiple that renders in columns

This is a CheckboxSelectMultiple widget that will render its choices divided evenly into multiple ul elements that can be styled nicely into columns. Pass in a css class to the constructor to be assigned to the ul's. See also: http://code.djangoproject.com/ticket/9230

  • checkbox
  • columns
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Browser-native date input field

Most modern browsers support the new `<input type="date">`, which allows inputting date using a browser-native date picker with built-in validation. This form widget utilizes this feature by setting the input type to "date" and by changing the value formatting as it should be in the ISO format. See more about `<input type="date">`: <https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/date>

  • forms
  • datefield
  • widget
  • input
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Add custom fields to the built-in Group model

Add fields and extend Django's built-in `Group` model using a `OneToOneField` (i.e. a profile model). In this example, we add a `UUIDField`. Whenever a new group is created, we automatically (via signals) create a corresponding `Role` record referencing the newly created group. Whenever a Group is deleted, the corresponding Role is deleted as well.

  • model
  • group
  • uuid
  • signals
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Ping All Search Engines

Nothing much to see here. Needed this little puppy for work and figured I and others will need it for other projects. Enjoy!

  • search
  • google
  • all
  • ping
  • engines
  • yahoo
  • live
  • ask
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PostgreSQL JSON subqueries

#### Allows to fetch a row or array of rows of data, linked to parent object, in a single query. Data is fetched as JSON and is not serialized into Django objects. ##### Example: from django.db import Models class Book(models.Model): authors = models.ManyToMany('Author', through='BookToAuthor', blank=True) title = models.CharField(max_length=512, default='') class Author(models.Model): name = models.CharField(max_length=512, default='') class BookToAuthor(models.Model): author = models.ForeignKey(Author, on_delete=models.CASCADE) book = models.ForeignKey(Book, on_delete=models.CASCADE) ##### Download author with all his/her books in a single query from django.db.models import OuterRef books_by_author_subquery = Book.objects.filter( id__in=BookToAuthor.objects.filter(author_id=OuterRef(OuterRef('id'))) ).values('title') author = Author.objects\ .annotate(books=SubqueryJsonAgg(books_by_author_subquery))\ .get(id=1)

  • json
  • postgres
  • postgresql
  • subquery
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django subdomain support for both resolve and reverse.

Add these two middleware to the top of MIDDLEWARE_CLASSES. Add BASE_DOMAIN to your setting file : BASE_DOMAIN = '.13.com'. your root urlconf may like this: urlpatterns = patterns('', url(r'^www:(?P<id>[0-9]+)/$', 'couponcn.store.views.site_index', name='site_index'), url(r'^news:abc/def/$', 'couponcn.store.views.site_index', name='site_index2'), ) then {% url site_index id=4 %}<br /> {% url site_index2 %} in your template or the reverse function will work out urls like this: http://www.13.com/4/ http://news.13.com/abc/def/

  • url
  • reverse
  • resolve
  • subdomain
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CacheInDictManager

This manager use a local (in python dicts) cache for efficiency. It caches get requests and is better used with a context manager. I based my work on this previous snippet : https://djangosnippets.org/snippets/815/

  • caching
  • Django Manager
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LazyPrimaryKeyRelatedField

When you change dynamicaly the objects manager on your Model class, you may want to have serializers take it into account.

  • DRF
  • PrimaryKeyRelatedField
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