Created
July 12, 2012 00:14
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Automatic redirects when changing slugs
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| from django.contrib.redirects.models import Redirect | |
| from django.contrib.sites.models import Site | |
| class BlogPost(models.Model): | |
| ... | |
| slug = models.CharField(unique=true, max_length=128) | |
| @models.permalink | |
| def get_absolute_url(def): | |
| return ('blogpost_detail', (), { 'slug' : self.slug }) | |
| from django.db.models.signals import pre_save | |
| from signals import create_redirect | |
| pre_save.connect(create_redirect, sender=BlogPost, dispatch_uid="001") | |
| def create_redirect(sender, instance, **kwargs): | |
| if sender == BlogPost: | |
| try: | |
| o = sender.objects.get(id=instance.id) | |
| if o.slug != instance.slug: | |
| old_path = o.get_absolute_url() | |
| new_path = instance.get_absolute_url() | |
| # Update any existing redirects that are pointing to the old url | |
| for redirect in Redirect.objects.filter(new_path=old_path): | |
| redirect.new_path = new_path | |
| # If the updated redirect now points to itself, delete it | |
| # (i.e. slug = A -> slug = B -> slug = A again) | |
| if redirect.new_path == redirect.old_path: | |
| redirect.delete() | |
| else: | |
| redirect.save() | |
| # Now add the new redirect | |
| Redirect.objects.create( | |
| site=Site.objects.get_current(), | |
| old_path=old_path, | |
| new_path=new_path) | |
| except sender.DoesNotExist: | |
| pass |
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