вторник, 15 января 2013 г., 16:34:36 UTC+4 пользователь Amirouche написал:
>
>
> The example in the code is not working, <<My>> class is not referenced
> anywhere. I'm not familiar with multi-widgets but if a tree widgets is not
> what you want or don't get it work, I think it's the right approach.
>
Unfortunately, I don't know how it should be. Also I believe your idea of
trees is much simpler and cleaner and thus much better.
I've installed django-mptt, and it works like a charm. But I'm worried it
would be difficult to upgrade to a new Django version if I use third-party
applications. So I was trying to implement similar approach using
ForeignKey to self, just like django-mptt does:
class Tag(models.Model):
name = models.CharField(max_length=50, unique=True, db_index=True)
parent = models.ForeignKey('self', null=True, blank=True,
related_name='children')
def __unicode__(self):
if self.parent: return '%s%s' % ('-', self.name)
return self.name
class AlbumAdminForm(forms.ModelForm):
class Meta:
model = Album
tags = forms.ModelMultipleChoiceField(queryset=getqueryset(),
required=False, widget=FilteredSelectMultiple('tags', False ))
getqueryset() should return a QuerySet Object, sorted like this:
parent1
child1_of_parent1
child2_of_parent1
parent2
child1_of_parent2
child2_of_parent2
but I couldn't solve this yet. Concatenating of QuereSets with | operation
drove me nowhere (result of | doesn't respect an order of concatenation)
and QuerySet.annotate() didn't help either. Also no luck with sorted(): it
returns some iterable object which is not a QuerySet, and Django fails
while rendering a template.
It's quite simple to get id list sorted in the right order:
def getalltags():
ids = []
cats = Tag.objects.filter(parent__isnull=True).order_by('name')
for id in cats.values_list('id', flat=True):
ids += [id]
tags = Tag.objects.filter(parent=id).order_by('name')
ids += tags.values_list('id', flat=True)
But I couldn't get a QuerySet sorted this way yet. So I still keep thinking.
Thank you again for all your help.
>
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To view this discussion on the web visit
https://groups.google.com/d/msg/django-users/-/9Hl2lisD_qMJ.
To post to this group, send email to django-users@googlegroups.com.
To unsubscribe from this group, send email to
django-users+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/django-users?hl=en.
