Hi all,
Just wondering if anyone has come across the following problem, and if
there is a way around it...
I'm using both multi-table inheritance and generic relations to
maintain a central repository of both general files, and display
images in the following, simplified, way,:
#
# models.py
#
class File(models.Model):
"""
This base class defines the generic relationship
and all properties common to all files
"""
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_object = generic.GenericForeignKey()
title = models.CharField(max_length=100)
file = models.FileField(upload_to='files/%Y/%m/%d')
class Image(File):
"""
Override the base class file field to access
image specific properties of the ImageField
"""
file = models.ImageField(upload_to='files/%Y/%m%d')
#
# admin.py
#
class FileInline(generic.GenericStackedInline):
model = File
extra = 1
class ImageInline(generic.GenericStackedInline):
model = Image
extra = 1
The generic inlines above are then imported into the admin.py of any
app which needs them and are referenced via the ModelAdmin's inlines
as you'd expect.
Now here's the problem... saving a File object via the generic inline
works as expected, but saving an Image via it's generic inline raises
the following error:
Cannot assign None: "Image.file_ptr" does not allow null values.
django/db/models/fields/related.py in __set__
253. if instance is None:
254. raise AttributeError, "%s must be accessed via instance" %
self._field.name
255.
256. # If null=True, we can assign null here, but otherwise the
value needs
257. # to be an instance of the related class.
258. if value is None and self.field.null == False:
259. raise ValueError('Cannot assign None: "%s.%s" does not allow
null values.' %
>>> 260. (instance._meta.object_name, self.field.name))
261. elif value is not None and not isinstance(value,
self.field.rel.to):
262. raise ValueError('Cannot assign "%r": "%s.%s" must be a "%s"
instance.' %
263. (value, instance._meta.object_name,
264. self.field.name, self.field.rel.to._meta.object_name))
265.
266. # Set the value of the related field
I'm running on SVN trunk as of changeset #9506, BTW.
It seems to me that the generic inline is not correctly handling the
_ptr foreign-key connecting the Image instance to it's parent File
instance.
If anyone can shed light on this, even if it's just a link to the
appropriate ticket number that would be greatly appreciated. If you
need additional info please let me know.
With best regards
Mike
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