operations.py 文件源码

def get_db_converters(self, expression):
        converters = super(MySQLOperations, self).get_db_converters(expression)
        if isinstance(expression.output_field, GeometryField) and self.uses_invalid_empty_geometry_collection:
            converters.append(self.convert_invalid_empty_geometry_collection)
        return converters

    # https://dev.mysql.com/doc/refman/en/spatial-function-argument-handling.html
    # MySQL 5.7.5 adds support for the empty geometry collections, but they are represented with invalid WKT.