I'm wondering if it's possible to apply ordering to a ManyToMany
relationship by using a `position` attribute on the join model. A
classic example (photo gallery) is probably the best way to illustrate
this:
class Photo(models.Model):
image = models.ImageField(upload_to="photos")
class Gallery(models.Model):
name = models.CharField(max_length=100)
photos = models.ManyToManyField(Photo, through='GalleryPhoto')
class GalleryPhoto(models.Model):
gallery = models.ForeignKey(Gallery)
photo = models.ForeignKey(Photo)
position = models.IntegerField(default=0)
class Meta:
ordering = ('position',)
(Also at http://dpaste.com/hold/165618/)
I want to attach photos with a gallery, like this:
>>> GalleryPhoto.objects.create(photo=photo1, gallery=some_gallery, position=1)
>>> GalleryPhoto.objects.create(photo=photo2, gallery=some_gallery, position=2)
And then have the photos retrievable through the gallery *according to
the position attribute* on the GalleryPhoto, like so:
>>> gallery.photos.all()
[photo1, photo2]
The simplest fix would be to add create a `get_photos` method on the
Gallery which does a query for it's photos, but I'd rather stick to
straight Django models if at all possible.
Thanks!
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