I've a generic app for saving files, usually photos and videos, but also
audio files, PDFs and some other binaries are supported. I've a model
called Content, which stores the file and some metadata, including
GeoDjango's PointField for GPS coordinates. I'm using PostgreSQL and
PostGIS 1.5. I think the most important parts of my models.py are here:
from django.contrib.gis.db import models
class Content(models.Model):
file = models.FileField()
point = models.PointField(geography=True, blank=True, null=True)
objects = models.GeoManager()
Now I've found out that this Content model would be useful (because it
contains lots of logic related to e.g. saving files) even without this GIS
part. Installing all GIS libraries etc. may be challenging sometimes in
some environments and if someone just wants to quickly test this app, I'd
like to make this PointField and GeoManager optional, so user could use
SQLite3 (without a need to install any external DBMS). Actually
PointField's coordinates are in most cases only used to show the file on
the map in this Content app, so FloatFields for lat and long would be
enough in most cases. BUT there are also some advanced features (e.g. find
nearest neighbors) which rely on GIS, so I don't want to completely move
this PointField out from Content model.
Basically I want to do this:
if GIS_DATABASE is True:
add PointField and GeoManager to Content model
else:
add lat and long FloatFields
Any clue how to do this without any horrible kludges? I've tried to put
'ENGINE':
'django.db.backends.sqlite3' into my settings.DATABASES and then something
like this:
class Content(models.Model):
try:
point = models.PointField(geography=True, blank=True, null=True)
objects = models.GeoManager()
except Exception, err:
print "IN MODEL", err
But running
$ python manage.py syncdb
just yields
Creating tables ...
AttributeError: 'DatabaseOperations' object has no attribute 'geo_db_type'
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