def contribute_to_class(self, cls, name, **kwargs):
super().contribute_to_class(cls, name, **kwargs)
# Setup for lazy-instantiated Raster object. For large querysets, the
# instantiation of all GDALRasters can potentially be expensive. This
# delays the instantiation of the objects to the moment of evaluation
# of the raster attribute.
setattr(cls, self.attname, SpatialProxy(gdal.GDALRaster, self))
def contribute_to_class(self, cls, name, **kwargs):
super(RasterField, self).contribute_to_class(cls, name, **kwargs)
# Importing GDALRaster raises an exception on systems without gdal.
from django.contrib.gis.gdal import GDALRaster
# Setup for lazy-instantiated Raster object. For large querysets, the
# instantiation of all GDALRasters can potentially be expensive. This
# delays the instantiation of the objects to the moment of evaluation
# of the raster attribute.
setattr(cls, self.attname, SpatialProxy(GDALRaster, self))
def contribute_to_class(self, cls, name, **kwargs):
super().contribute_to_class(cls, name, **kwargs)
# Setup for lazy-instantiated Geometry object.
setattr(
cls, self.attname,
SpatialProxy(self.geom_class or GEOSGeometry,
self,
load_func=GEOSGeometry))
def contribute_to_class(self, cls, name, **kwargs):
super(GeometryField, self).contribute_to_class(cls, name, **kwargs)
# Setup for lazy-instantiated Geometry object.
setattr(cls, self.attname, SpatialProxy(Geometry, self))
