I had a similar issue when uploading a kml to geojson conversion to postgis
using geodjango. There is no efficient way to do it in Django, so I ended
up doing a workaround
- Create two geometry types, one with dims=2 and other with dims=3.
Allow both to be null and set default to null
- When updating, check the geometry dimension via GEOSGeometry.hasz
<https://docs.djangoproject.com/en/1.9/ref/contrib/gis/geos/#django.contrib.gis.geos.GEOSGeometry.hasz>.
If the return is 2, save the geom in the 2D field, otherwise save to the 3D
You can create a save/retrieve method on the model to handle this for you.
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