this is my example
class Type(models.Model):
type = models.CharField('分类名称',maxlength=50,core=True)
path = models.CharField('url地址',maxlength=250,blank=True,editable=False)
typename = models.CharField('分类名称',maxlength=200,editable=False)
parent = models.ForeignKey('self',related_name="munchie",null=True,
blank=True)
created = models.DateTimeField(auto_now_add=True)
order_id=models.IntegerField ('排序',default=0)
fid=models.IntegerField ('根ID',default=0,editable=False)
cengshu=models.IntegerField ('层数',default=1,editable=False)
2008/4/1, Legioneer <[EMAIL PROTECTED]>:
>
>
> Thank you, Michael. Tried several combinations but it doesn't work
> either.
>
> 1. First I tried to use Category.objects.all():
> c = Category.objects.all()
> serializers.serialize("json", c)
>
> and got the same error.
>
> 2. Then tried to init some variable with s[:5] and the result didn't
> change.
>
> 3. When I use some other model which doesn't refer to itself (is a non
> recursive) it works fine even when using with lazy filter calls
> similar to my first example.
>
> Anthony
>
>
> On Apr 1, 5:34 am, Michael <[EMAIL PROTECTED]> wrote:
> > Your error is actually coming from the fact that you are not getting
> > any results from your filter query. The reason that the error is
> > appearing on the second line of your script is because filter is a
> > lazy call and isn't really made until you ask it to return objects in
> > this bit: s[:5]. Change your filter or call Category.objects.all() it
> > should work.
> >
> > Hope that helps,
> > Michael
> >
>
> > On Mon, Mar 31, 2008 at 5:39 AM, Legioneer <[EMAIL PROTECTED]> wrote:
> >
> > > Hi All,
> >
> > > I'm trying to serialize recursive model (a category which refers to
> > > itself) and get a 'DoesNotExist: Category matching query does not
> > > exist', while other models work fine. Does anyone know a clue for
> > > this?
> >
> > > I'm doing like this:
> >
> > > from django.core import serializers;
> > > from newproject.models import Category
> >
> > > s = Category.objects.filter(parent__exact='0')
> > > serializers.serialize("json", s[:5])
> >
> > > and get:
> > > Traceback (most recent call last):
> > > File "<console>", line 1, in ?
> > > File "/usr/lib/python2.3/site-packages/django/core/serializers/
> > > __init__.py", line 72, in serialize
> > > s.serialize(queryset, **options)
> > > File "/usr/lib/python2.3/site-packages/django/core/serializers/
> > > base.py", line 48, in serialize
> > > self.handle_fk_field(obj, field)
> > > File "/usr/lib/python2.3/site-packages/django/core/serializers/
> > > python.py", line 41, in handle_fk_field
> > > related = getattr(obj, field.name)
> > > File "/usr/lib/python2.3/site-packages/django/db/models/fields/
> > > related.py", line 209, in __get__
> > > rel_obj = self.field.rel.to._default_manager.get(**params)
> > > File "/usr/lib/python2.3/site-packages/django/db/models/manager.py",
> > > line 69, in get
> > > return self.get_query_set().get(*args, **kwargs)
> > > File "/usr/lib/python2.3/site-packages/django/db/models/query.py",
> > > line 263, in get
> > > raise self.model.DoesNotExist, "%s matching query does not exist."
> > > % self.model._meta.object_name
> > > DoesNotExist: Category matching query does not exist.
> >
> > > Anthony
> >
>
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