I had not seen the generic relationships and ContentType. I'm going to play
with that a bit.
Thanks everybody!
2010/11/20 Łukasz Rekucki <lreku...@gmail.com>
> On 20 November 2010 02:51, Micah Carrick <mi...@greentackle.com> wrote:
> > I'm having trouble coming up with a pretty solution to a seemingly simple
> > task. I'm relatively new to Django.
> >
> > I want to allow the end user to control various lists of links on the
> site
> > used for navigation. The admin should allow the creation of "link groups"
> > which have a collection of "links". These links would reference a
> > pre-determined list of models. Let's say, for example, that there is a
> "link
> > group" created for the footer links of a website. In the admin section, a
> > user could add a link to a specific blog (from the Blog model), another
> link
> > to the about us page (flatpages), etc.
> >
> > In other words, I'm trying to associate individual records from a number
> of
> > tables together as a group of objects having a URL. I'm trying to find a
> > nice, abstract solution. Obviously I don't want actual URLs in the
> database.
> > This is something I would use frequently so I want to see if I can find
> or
> > write an app to do this--if I can come up with an elegant solution.
> >
> > This would be nice, but, I can't imagine how it could be possible:
> >
> >
> > class LinkGroup(models.Model):
> > site = models.ForeignKey(Site)
> > name = models.CharField()
> >
> > class Links(models.Model):
> > link_group = ForeignKey(LinkGroup)
> > model_type = ???
> > model_id = ForeignKey(<to the PK of the above the model_type>) # no
> can
> > do!
> > sort_order = PositiveIntegerField(default=100)
> >
> >
> > This is an idea, however, I don't like having to reference the import in
> the
> > DB. It's just begging for problems.
> >
> >
> > class LinkModel(models.Model):
> > name = models.CharField() # such as "Flat Page"
> > model = models.CharField() # such as "myapp.models.FlatPage"
> >
> > class LinkGroup(models.Model):
> > site = models.ForeignKey(Site)
> > name = models.CharField() # such as "Navigation Links"
> >
> > class Link(models.Model):
> > text = CharField() # such as "About Us"
> > link_group = ForeignKey(LinkGroup)
> > model = ForeignKey(LinkModel)
> > model_id = PositiveIntegerField() # such as the PK for the
> > myapp.models.FlatPage model
> > sort_order = PositiveIntegerField(default=100)
> >
> >
> > Any suggestions?
>
> You should checkout generic foreign keys[1]. It's a standard way of
> building models that need to reference rows in more then one table. So
> your models would be something like this:
>
> from django.contrib.contenttypes.models import ContentType
> from django.contrib.contenttypes import generic
>
> class LinkGroup(models.Model):
> site = models.ForeignKey(Site)
> name = models.CharField() # such as "Navigation Links"
>
> class Link(models.Model):
> link_group = ForeignKey(LinkGroup)
> content_type = models.ForeignKey(ContentType)
> object_id = models.PositiveIntegerField()
> linked_object = generic.GenericForeignKey('content_type', 'object_id')
>
>
> [1]:
> http://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/#generic-relations
>
> --
> Łukasz Rekucki
>
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