def set_raw_field_value(self, instance, field_name, value):
        field = instance._meta.get_field(field_name)
        setattr(instance, field.attname, value)
Performs set up for executing the spatial function.
dataset/ETHPy150Open django-mptt/django-mptt/mptt/models.py/MPTTOptions.set_raw_field_value--crossover with--dataset/ETHPy150Open django/django/django/contrib/gis/db/models/query.py/GeoQuerySet._spatial_setup