heya,
The thing is, the foreign key field is on the Address object, linking
to another object that *has* an address.
AFAIK, that's how it's meant to be in database design.
That's why I need to put something there - e.g.
class Address(models.Model):
...
user = models.ForeignKey(UserProfile)
but that doesn't work for hospitals, or say institutions, or anything
else that needs an address. So I can't just pick one. Or is my design
off?
Cheers,
Victor
On Jan 19, 6:03 pm, greatlemer <greatle...@googlemail.com> wrote:
> On Jan 19, 5:25 am, Victor Hooi <victorh...@gmail.com> wrote:
>
>
>
> > heya,
>
> > I'm trying to use an "Address" model as a generic relation against
> > multiple other models (e.g. in a "User Profile", for each User, as
> > well as for "Building", "Institution", and various other ones).
>
> > So I've added the content_type, object_id and content_object fields to
> > Address.
>
> > class Address(models.Model):
> > """
> > Basic object for holding address information - for either people
> > or institutions.
> > """
> > street_address = models.CharField(max_length=50)
> > suburb = models.CharField(max_length=20)
> > state = models.CharField(max_length=3,
> > choices=AUSTRALIAN_STATES_CHOICES)
> > # PositiveIntegerField doesn't allow max_length? Have to use form
> > validation for this.
> > postcode = models.CharField(max_length=4)
> > # This should probably be a list of choices.
> > country = models.CharField(max_length=20)
> > address_category = models.OneToOneField(AddressCategory)
>
> > # We make Address a generic relation model
> > content_type = models.ForeignKey(ContentType)
> > object_id = models.PositiveIntegerField()
> > content_object = generic.GenericForeignKey('content_type',
> > 'object_id')
>
> > class Meta:
> > verbose_name_plural = 'Addresses'
>
> > def __unicode__(self):
> > return self.street_address + ', ' + self.suburb
>
> > And my other objects have GenericRelations to Address. E.g.:
>
> > class Hospital(models.Model):
> > name = models.CharField(max_length=20)
> > address = generic.GenericRelation(Address)
>
> > def __unicode__(self):
> > return self.name
>
> > However, when I try and use the Django admin to add an Address item,
> > the form has fields for content_type and object_id. I had thought
> > these fields wouldn't appear? Also, the model won't validate/save if I
> > don't fill in these fields. I don't think I'm quite using this right -
> > is there a better way of doing what I'm trying to achieve here?
>
> > Also, I'm using the Address object as in Inline for the other models,
> > so I have an Address Inline as well (Nb: I'm using django-reversion
> > with this site, hence the "VersionAdmin")
>
> > class AddressAdmin(VersionAdmin):
> > pass
> > class AddressInline(generic.GenericTabularInline):
> > model = Address
> > ...
> > class HospitalAdmin(admin.ModelAdmin):
> > inlines = [
> > AddressInline,
> > ]
> > ...
> > admin.site.register(Address, AddressAdmin)
>
> > Thanks,
> > Victor
>
> Hi,
>
> I think here what you're looking for is to use:
> address = models.ForeignKey(Address)
> rather than a GenericRelation. GenericRelations are for cases when
> you don't know what the target model should be (hence the extra
> content_type field).
>
> --
> G
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