options.py 文件源码

def formfield_for_dbfield(self, db_field, request, **kwargs):
        """
        Overloaded from ModelAdmin so that an OpenLayersWidget is used
        for viewing/editing 2D GeometryFields (OpenLayers 2 does not support
        3D editing).
        """
        if isinstance(db_field, models.GeometryField) and db_field.dim < 3:
            if not HAS_GDAL and db_field.srid != self.map_srid:
                raise ImproperlyConfigured(
                    "Map SRID is %s and SRID of `%s` is %s. GDAL must be "
                    "installed to perform the transformation."
                    % (self.map_srid, db_field, db_field.srid)
                )
            # Setting the widget with the newly defined widget.
            kwargs['widget'] = self.get_map_widget(db_field)
            return db_field.formfield(**kwargs)
        else:
            return super(GeoModelAdmin, self).formfield_for_dbfield(db_field, request, **kwargs)