I define a class: class BuildLogger @@build_logger=nil def self.get_build_logger(file_name=nil) if @@build_logger == nil ###this line will thrown an error @@build_logger=Logger.new("build_logger") @@build_logger.level = DEBUG end return @@build_logger end end I invoke BuildLogger.get_build_logger in a controller. An error "Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id" is always thrown on the "if" line. I have no idea about this error. does anyone know this problem?
on 2009-01-21 03:53