How to create a unique slug in Django

Question

I am trying to create a unique slug in Django so that I can access a post via a url like this: http://www.example.com/buy-a-new-bike_Boston-MA-02111_2

The relevant m

Answer 1

from django.utils.text import slugify Helps a lot and has quite clear Concepts. Here one example on How to auto-generate slug by using from django.utils.text import slugify

utils.py

from django.utils.text import slugify
import random
import string

# Random string generator
def random_string_generator(size=10, chars=string.ascii_lowercase + string.digits):
    return ''.join(random.choice(chars) for _ in range(size))

# Unique Slug Generator 
def unique_slug_generator(instance, new_slug=None):
    """
    It assumes your instance has a model with a slug field and a title character (char) field.
    """
    if new_slug is not None:
        slug = new_slug  
    else:
        slug = slugify(instance.title)  

    Klass = instance.__class__

    qs_exists = Klass.objects.filter(slug=slug).exists()

    if qs_exists:
        new_slug = "{slug}-{randstr}".format(slug=slug, randstr=random_string_generator(size=4))
        return unique_slug_generator(instance, new_slug=new_slug)
    return slug

models.py

from django.db.models.signals import pre_save # Signals
# import the unique_slug_generator from .utils.py 
from .utils import unique_slug_generator

class Product(models.Model):
    title  = models.CharField(max_length=120)
    # set blank to True
    slug  = models.SlugField(blank=True, unique=True)

def product_pre_save_receiver(sender, instance, *args, **kwargs):
    if not instance.slug:
        instance.slug = unique_slug_generator(instance)


pre_save.connect(product_pre_save_receiver, sender=Product)

Django documentation explains Django.utils.text import slugify to generate slug automatically. You can read more detail here

After implementing the code, while creating product, you may leave the slug field blank, which will be further aquired with auto generated slug for the product which will be unique in this case.