SpatialRefSys as foreign key?

Hi everybody.

Using the working stuff reported at
https://code.djangoproject.com/wiki/GeoDjangoExtras, I've written the
following model:

from django.contrib.gis.models import SpatialRefSys

class LandCover(models.Model):
shp_name = models.CharField(max_length=100)
geom_srid = models.ForeignKey(SpatialRefSys)

But syncdb gives me the following error :

[user@host]$ ./manage.py syncdb
CommandError: One or more models did not validate:
myapp.landcover: 'geom_srid' has a relation with model <class
'django.contrib.gis.db.backends.postgis.models.SpatialRefSys'>, which
has either not been installed or is abstract.

Is there a way to solve this?

Thanks in advance,

Alessandro


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