On Thursday, 2 January 2014 21:09:22 UTC, arthur...@gmail.com wrote:
>
> I have the following model in my app, using the content-type django
> framework in version 1.6.1 :
>
> class GenericMedia(models.Model):
> limit = models.Q(model = 'Image') | models.Q(model = 'Video') |
> models.Q(model = 'Other')
> content_type = models.ForeignKey(ContentType, limit_choices_to = limit)
> object_id = models.PositiveIntegerField()
> content_object = generic.GenericForeignKey('content_type', 'object_id')
>
> def __unicode__(self):
> return u"%s" % os.path.basename(self.content_object.url.name)
>
> def instance(self):
> return self.content_object.__class__.__name__
>
> class Media(models.Model):
> description = models.CharField(blank = True, max_length = 500)
> link = models.URLField(blank = True)
> genericFK = generic.GenericRelation(GenericMedia,
> content_type_field='content_type', object_id_field='object_id')
>
> class Meta:
> abstract = True
>
> def __unicode__(self):
> return u"%s" % os.path.basename(self.url.name)
>
> def save(self, *args, **kwargs):
> super(Media, self).save(*args, **kwargs)
> generic_link = GenericMedia(content_object = self)
> generic_link.save()
>
> class Image(Media):
> imgW = models.PositiveSmallIntegerField()
> imgH = models.PositiveSmallIntegerField()
> url = models.ImageField(upload_to = 'mediamanager', height_field =
> 'imgH', width_field = 'imgW')
>
> Everythings works fine, excepts the GenericRelation in my abstract Media
> Class.
>
> In django documentation it is said that :
> If you delete an object that has a GenericRelation, any objects which have a
> GenericForeignKey pointing at it will be deleted as well.
>
> But my problem is that when I delete an image (wich extends Media), the
> GenericMedia pointing to it is not deleted.
>
> If anyone has a solution, thanks !
>
>
I don't understand why you are using generic relations at all here. Model
subclassing and generic relations are *alternatives* to allow multiple
model types to relate to a single destination. Since your subclasses
already all inherit from Media, why do you need a generic relation between
Media and GenericMedia? Why not a standard ForeignKey? Or why not inherit
directly from GenericMedia in the first place?
--
DR.
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