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# blog/converters.py — custom path converter
class FourDigitYearConverter:
    regex = '[0-9]{4}'

def to_python(self, value):
        return int(value)

def to_url(self, value):
        return f'{value:04d}'

# blog/urls.py — register and use custom converter
from django.urls import path, register_converter
from . import converters, views

register_converter(converters.FourDigitYearConverter, 'yyyy')

urlpatterns = [
    path('archive/<yyyy:year>/', views.PostYearArchiveView.as_view(), name='post-year'),
]

# Slug-based URLs instead of IDs
# blog/models.py
from django.db import models
from django.utils.text import slugify

class Post(models.Model):
    title = models.CharField(max_length=200)
    slug  = models.SlugField(max_length=200, unique=True, blank=True)

def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.title)
        super().save(*args, **kwargs)

def get_absolute_url(self):
        from django.urls import reverse
        return reverse('blog:post-detail', kwargs={'slug': self.slug})

# blog/urls.py with slug
urlpatterns = [
    path('<slug:slug>/', views.PostDetailView.as_view(), name='post-detail'),
]