> I have a model for Thumbnail, but I cannot save it. It says:
> AttributeError: 'Thumbnail' object has no attribute 'id'.
> What is wrong?
>
> I use django 1.0-final-SVN-unknown
>
> thanks, Manuel
>
> Here is an example:
>
> >>> from portfolio.models import Photo, Thumbnail
> >>> p = Photo.objects.all()[0]
> >>> t = Thumbnail(p,'w300')
See below..
> >>> t.save()
>
> Traceback (most recent call last):
> File "<console>", line 1, in <module>
> File "/Users/manuel/Sites/mgh/django/db/models/base.py", line 307,
> in save
> self.save_base(force_insert=force_insert, force_update=force_update)
> File "/Users/manuel/Sites/mgh/django/db/models/base.py", line 347,
> in save_base
> pk_val = self._get_pk_val(meta)
> File "/Users/manuel/Sites/mgh/django/db/models/base.py", line 288,
> in _get_pk_val
> return getattr(self, meta.pk.attname)
> AttributeError: 'Thumbnail' object has no attribute 'id'
>
> The models:
>
> from django.db import models
> from django.utils.translation import ugettext as _
> import Image as PilImage
> import ekin.settings as s
> import os
>
> # Create your models here.
> class Galery(models.Model):
> title = models.CharField(_("Name"), max_length=200)
>
> class Photo(models.Model):
> picture = models.ImageField(null=True, upload_to='./images/')
> caption = models.CharField(_("Optional
> caption"),max_length=100,null=True, blank=True)
> item = models.ForeignKey(Galery)
>
> def get_thumbnail_url(self, string):
> return Thumbnail(self, string).get_thumbnail()
>
> def __unicode__(self):
> return unicode(self.picture)
>
> class Thumbnail(models.Model):
> miniature_url = models.CharField(max_length=100)
> item = models.ForeignKey(Photo)
> x,y = None, None
> def __init__(self, item, dimensions):
> self.dimensions = dimensions
> self.item = item
> self.__process()
> self.__make_thumbnail()
You are overriding __init__ but not making sure to call the base
class's __init__ method which does a whole bunch of stuff whenever a
new instance of a Model class is created. This is most definitely
causing your problem. It's best not to overload it with your own
__init__. A better option is to hook into the post_init signal with a
custom method and in that method do your process() and
make_thumbnail() calls.
See:
- http://docs.djangoproject.com/en/dev//topics/signals/
- http://docs.djangoproject.com/en/dev/ref/signals/
-RD
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