Thanks again. Just following up with my model to show how I'm
implementing based on the advice above.
Note I call my categories model Topics instead but you get the
picture.
class Topic(models.Model):
'''
Topics form sections and categories of posts to enable topical
based
conversations.
'''
text = models.CharField(max_length=75)
parent = models.ForeignKey('self', null=True, blank=True) # Enable
topic structures.
description = models.TextField(null=True, blank=True)
slug = models.CharField(max_length=75)
path = models.CharField(max_length=255)
# Custom manager for returning published posts.
objects = TopicManager()
def get_path(self):
'''
Constructs the path value for this topic based on hierarchy.
'''
ontology = []
target = self.parent
while(target is not None):
ontology.append(target.slug)
target = target.parent
ontology.append(self.slug)
return '/'.join(ontology)
def save(self, force_insert=False, force_update=False):
'''
Custom save method to handle slugs and such.
'''
# Set pub_date if none exist and publish is true.
if not self.slug:
qs = Topic.objects.filter(parent=self.parent)
unique_slugify(self, self.text, queryset=qs) # Unique for
each parent.
# Raise validation error if trying to create slug duplicate
under parent.
if
Topic.objects.exclude(pk=self.pk).filter(parent=self.parent,
slug=self.slug):
raise ValidationError("Slugs cannot be duplicated under
the same parent topic.")
self.path = self.get_path() # Rebuild the path attribute
whenever saved.
super(Topic, self).save(force_insert, force_update) # Actual
Save method.
def __unicode__(self):
'''Returns the name of the Topic as a it's chained
relationship.'''
ontology = []
target = self.parent
while(target is not None):
ontology.append(target.text)
target = target.parent
ontology.append(self.text)
return ' - '.join(ontology)
class Meta:
ordering = ['path']
unique_together = (('slug', 'parent'))
On Apr 7, 8:34 pm, Tim Shaffer <t...@tim-shaffer.com> wrote:
> Oh, check out the Category class from django-simplecms. It implements
> the first method.
>
> Specifically, check out the save() method that builds the path based
> on all the parent categories if it doesn't exist.
>
> http://code.google.com/p/django-simplecms/source/browse/trunk/simplec...
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