schema.py 文件源码

def delete_model(self, model, **kwargs):
        from django.contrib.gis.db.models.fields import GeometryField
        # Drop spatial metadata (dropping the table does not automatically remove them)
        for field in model._meta.local_fields:
            if isinstance(field, GeometryField):
                self.remove_geometry_metadata(model, field)
        # Make sure all geom stuff is gone
        for geom_table in self.geometry_tables:
            try:
                self.execute(
                    self.sql_discard_geometry_columns % {
                        "geom_table": geom_table,
                        "table": self.quote_name(model._meta.db_table),
                    }
                )
            except DatabaseError:
                pass
        super(SpatialiteSchemaEditor, self).delete_model(model, **kwargs)