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Automatic slug generation signal

Author:
danux
Posted:
June 25, 2011
Language:
Python
Version:
1.3
Score:
0 (after 0 ratings)

A pre_save signal that will automatically generate a slug for your model based on the "title" attribute, and will store the new slug in the "slug" attribute.

USAGE: from django.db.models.signals import pre_save

from YOURPACKAGE import slug_generator

pre_save.connect(slug_generator, sender=YOURMODEL)

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from django.template.defaultfilters import slugify

def find_available_slug(object, instance, slug):
    """
    Recursive method that will add underscores to a slug field
    until a free value is located
    """
    try:
        sender_node = object.objects.get(slug=slug)
    except object.DoesNotExist:
        instance.slug = slug
    else:
        slug = '%s_' % slug
        find_available_slug(object, instance, slug)
    return

def slug_generator(sender, **kwargs):
    """ Generates a unique slug for a node """
    instance = kwargs['instance']
    if instance.slug is not '':
        return
    slug = slugify(instance.title)
    find_available_slug(sender, instance, slug)

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