I did the following: 

from django.contrib.gis.geos import GEOSGeometry, WKTWriter
wkt_w = WKTWriter()
wkt_w.outdim = 2 # This sets the writer to output 2D WKT
polygon = GEOSGeometry(json.dumps(item['geometry'])) # The 3D geometry
temp = wkt_w.write(polygon)
polygon = GEOSGeometry(temp) # The 3D geometry

Here it is in the 
docs: 
https://docs.djangoproject.com/en/1.11/ref/contrib/gis/geos/#django.contrib.gis.geos.WKBWriter.outdim


On Monday, 7 March 2016 20:43:05 UTC+2, Jônatas Castro wrote:
>
> In my project I need to import *shapefiles* and same some geometry.
>
> Some of these are *MULTIPOLYGON Z* type, but all Z coordinates are 
> 0-value.
>
> When I try to save the geometry, I get the error: *"Geometry has Z 
> dimension but column does not".*
>
> *What is the best way to strip the Z dimension?*
>
>
>
> My code:
>
>
>
> *ds = DataSource(file_path, encoding='ISO-8859-1')layers = ds[0]*
>
> *#need something HERE to coerce geometry to 2D*
>
>
> *obj=MyModel(geometry=GEOSGeometry(layers[0].geom.hex))*
> *obj.save()*
>
>

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