hi all, Base upon Julio's mptt-0.9 which handles nested contents:
http://code.djangoproject.com/wiki/ModifiedPreorderTreeTraversal I made this more "generic" version mptt-0.95, from the README: [snip] orignal mptt readme [/snip] Follow up by me =============== First of all, ***BIG Thanks*** to `Gijs Van Tulder's excellent article`_ on the MPTT subject & Julio's GREAT work on this django implementation! mptt-0.95 (following django's svn version number:) based on Julio's code, and make it even more "generic": - Julio's version treats the root content (for example, an Article object which is going to be commented/follow-up'd) & the tree of the root content differently), so the Node model is in response for both "describing a tree" & "storing node content". - In this modified version, I "limit" the Node model's responsibility to only "describing a tree": you keep storing your model's data in a "flat" way, once necessary, you can organize them into a "tree", and, ***you can organize this tree across all of the models of your site***, that means, you can build your tree with User, Article, Group, WhatEver model's object instances as the tree's node:) While comparing the code between Julio's original version and my modified version, please note: Both versions are using the GenericForeignKey_ like technique, and both have content_type & object_id fields, however, they are different: - Julio's version uses these fields to refer to the ***root content object of the Node tree***; - This modified version uses them to refer to ***content object that becomes a nodes of the tree*** Please check the code for detail:) Sample code ----------- from path.to.your.models import Article from agv.apps.mptt.models import Node a1 = Article.objects.get(pk=1) a2 = Article.objects.get(pk=2) a3 = Article.objects.get(pk=3) a4 = Article.objects.get(pk=4) a5 = Article.objects.get(pk=5) n1 = Node(content_object=a1) # the root node n1.save() # 2nd level nodes n2 = Node(content_object=a2, parent=a1) n2.save() n3 = Node(content_object=a3, parent=a1) n3.save() # 3rd level nodes n4 = Node(content_object=a4, parent=a2) n4.save() n5 = Node(content_object=a5, parent=a3) n5.save() # you can even do this from path.to.your.other.models import Banana b = Banana.objects.get(pk=1) # add the banana to the tree of articles! :-p n6 = Node(content_object=b, parent=a1) n6.save() Thanks again to Julio's code! Please help me to test it if you're interested:) Sorry for my poor English! With any problem, find me at: Eric Hsu [EMAIL PROTECTED] .. _Gijs Van Tulder's excellent article: http://www.sitepoint.com/print/hierarchical-data-database .. _GenericForeignKey: http://feh.holsman.net/articles/2006/06/19/django-generic-relations -- - http://www.ifaxian.com - http://groups.google.com/group/nkeric-daily - http://nkeric.3322.org --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~----------~----~----~----~------~----~------~--~---
mptt-0.95.tar.bz2
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