django-array-tags

A simple Tag solution for Django using django.contrib.postgres.fields.ArrayField.

Usage

Add the ArrayField to your model:

from array_tags.fields import TagField
from array_tags.managers import TagQuerySet


class MyModel(models.Model):
    tags = TagField()

    objects = TagQuerySet.as_manager()

Now you have tags! Values will be stripped and de-duplicated on save.

You can optionally pass lower=True to TagField to lower-case all values before saving.

The model will gain a helper method get_most_like_by_FIELD where FIELD is replaced with the name of the field. This will call the most_like method on the manager, passing the field name and this instances tags.

TagQuerySet

For convenience, there is also a TagQuerySet which adds three methods:

all_tag_values(name)

Returns a values queryset of all the tags in the objects in the current queryset from the TagField named name.

count_tag_values(name)

Returns a values queryset of tags and how many objects have that tag, from the current queryset.

most_like(name, tags)

Returns a queryset ordered by the number of tags in field name found in tags. The number is annotated in similarity.

Unnest

Finally, there is an additional ORM Function Unnest for applying the Postgres Array function Unnest in queries.

Admin Widget

Included is a "smart" tag widget for use in Admin.

Unlike other uses, this requires array_tags to be included in settings.INSTALLED_APPS.

In your admin.py:

from django.contrib.postgres.fields import ArrayField
from array_tags import widgets


class MyClassAdmin(admin.ModelsAdmin):
    formfield_overrides = {
        ArrayField: {'widget': widgets.AdminTagWidget},
    }