On Thu, 2006-07-13 at 22:03 -0500, Chris Moffitt wrote: > I'm using the recipe here > (http://code.djangoproject.com/wiki/CookBookCategoryDataModelPostMagic) > for a category model. It's working well for the most part. > > I am getting a little stuck trying to figure out how to turn it into a > vertical navigation structure. I've looked at > http://code.djangoproject.com/wiki/ModifiedPreorderTreeTraversal but I > think this is not as nice from an admin perspective so I'm not using it. > > My category structure might look like books :: non-fiction :: technical > :: Django for Dummies > > How can I create some sort of menu structure like I've shown below? > > Books > ->Non-fiction > ->History > ->Biographies > ->Technical > ->Fiction > Movies > Games > > I'm a little worried that all the recursion could get painful from a > performance perspective & I figure this is a common enough situation > that maybe someone else already has something that works pretty well.
It's not too bad to do the obvious thing. I do something similar in the sidebar of http://www.pointy-stick.com/blog/ and on http://www.pointy-stick.com/blog/topics/ . I'm not nearly as cool as Ian Holsman, so I don't have a version control respository online. You can grab the source code from http://www.pointy-stick.com/software/website-latest.tar.gz and have a look, though. It's basically the recursion approach you are talking about. Performance isn't too bad for "reasonable" levels of nesting. Start at weblog/templatetags/mt_weblog.py (TagCloud.render, in particular) and work back to the Tag model. Once we get model-aware validators in place, I intend to switch to using a slightly different encoding for tag sub-trees, as mentioned in the comments in weblog/models.py, so I haven't worked too hard on making this neat and spiffy yet as the "extract all tags" portion can be done in a single query with a slightly different model setup. Regards, Malcolm --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~----------~----~----~----~------~----~------~--~---
