Hi,
Does this help you?
myslug=...
parents=[]
while myslug:
cat_crumb=Category.objects.get(slug=myslug) # I guess slug is unique
parents.append(cat_crumb)
myslug=cat_crumb.parent
But be careful, you might get infinite loops if the parent links
to a child. To avoid this you could write an "assert len(parents)<100"
into the loop.
Except you have a really deeply nested categories.
BTW, Why is "parent" a slug field and not a foreign key?
I attached my tree mix in.
coderb schrieb:
> sorry, had not finished this post before accidently submitting it...
>
> for myslug not null
> catcrumb_list = Category.objects.filter(slug=myslug)
> myslug = catcrumb_list.parent
>
> basically, I want to loop through the category model a parent is not
> found, and each pass, store the model tupel in catcrumblist.
>
> I tried catcrumb_list.append, but returns read-only error on 'list'
>
> any help would be apprec-ated.
>
> thank you
>
--
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de
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# -*- coding: iso-8859-1 -*-
# $Id: tree.py 148 2008-10-15 08:19:10Z tguettler $
# $HeadURL: svn+ssh://svnserver/svn/djangotools/trunk/utils/tree.py $
empty_magic=object()
class Tree(object):
u'''
Model Mix-In
Usage:
class TreeTag(models.Model, tree.Tree):
parent=models.ForeignKey('self', related_name='children', null=True, blank=True)
name=models.CharField(max_length=64)
...
'''
MAX_REC_DEPTH=1000
def __unicode__(self, rec_depth=0):
if not self.parent:
return self.name
if rec_depth>self.MAX_REC_DEPTH:
raise AssertionError('Tree is a loop')
return '%s / %s' % (self.parent.__unicode__(rec_depth+1), self.name)
def parents(self, me_too=False):
iloop=0
parent=self.parent
parents=[]
if me_too:
parents.append(self)
while parent:
iloop+=1
assert iloop<self.MAX_REC_DEPTH, 'Tree is a loop'
parents.append(parent)
parent=parent.parent
return parents
def get_children(self, children=None, me_too=False, rec_depth=0, ids=False):
assert rec_depth<self.MAX_REC_DEPTH
if children==None:
assert rec_depth==0
children=set()
else:
assert rec_depth>0
for child in self.children.all():
if ids:
children.add(child.id)
else:
children.add(child)
child.get_children(children, rec_depth=rec_depth+1)
if me_too:
if ids:
children.add(self.id)
else:
children.add(self)
return children
def test(self):
self.parents() # raises Exception if infinit loop
@classmethod
def str_to_object(cls, object_str, default=empty_magic):
'''
Gibt zu einer Zeichenkette 'Foo / ...'
die entsprechend Objekt (Belegart/Tag) zurück. Falls
die Objekt unbekannt ist, wird None, zurückgegeben.
'''
mylist=object_str.split('/')
mylist.reverse()
kwargs={}
level=0
for name in mylist:
name=name.strip()
assert name
kwargs['%sname' % (level*'parent__' )]=name
level+=1
assert level
kwargs['%sisnull' % (level*'parent__')]=True
try:
obj=cls.objects.get(**kwargs)
except cls.DoesNotExist:
if default==empty_magic:
raise cls.DoesNotExist(unicode(kwargs))
return default
return obj
