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comp.lang.ruby

Need cohercing a var into a method name

Phy Prabab

2/22/2008 10:14:00 PM

[Note: parts of this message were removed to make it a legal post.]

Hello,

I need a small bit of help, I am playing with Logger class and ran into a small problem I am not sure how to solve. Namely, I was interested in command line setting of the logging level, however, the passed argument is not accepted as a method name nor can I figure out how to get the arg "coherced" to a string prior to evaluation of the method call. Here is my code:

when "--debug"
if(DEBUG_LEVELS.include?(arg))
mylog.level = Logger::arg.to_s
^^^^^^^^^^^^
else
puts " "Debug level can be one of DEBUG, INFO, WARN, ERROR, or FATAL."
.....
(hi-lited is the code segment in question)
I am using GetoptLong to do the cmd line processing. The error given by ruby is:
test.rb:136 undefined method `arg' for Logger:Class (NoMethodError)
...

TIA,
Phy


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2 Answers

Rob Biedenharn

2/22/2008 10:29:00 PM

0

On Feb 22, 2008, at 5:14 PM, Phy Prabab wrote:
> Hello,
>
> I need a small bit of help, I am playing with Logger class and ran
> into a small problem I am not sure how to solve. Namely, I was
> interested in command line setting of the logging level, however,
> the passed argument is not accepted as a method name nor can I
> figure out how to get the arg "coherced" to a string prior to
> evaluation of the method call. Here is my code:
>
> when "--debug"
> if(DEBUG_LEVELS.include?(arg))
> mylog.level = Logger::arg.to_s
> ^^^^^^^^^^^^
> else
> puts " "Debug level can be one of DEBUG, INFO, WARN, ERROR,
> or FATAL."
> .....
> (hi-lited is the code segment in question)
> I am using GetoptLong to do the cmd line processing. The error
> given by ruby is:
> test.rb:136 undefined method `arg' for Logger:Class (NoMethodError)
> ...
>
> TIA,
> Phy

Logger.const_get(arg)

-Rob

Rob Biedenharn http://agileconsult...
Rob@AgileConsultingLLC.com

Rick DeNatale

2/22/2008 10:45:00 PM

0

On 2/22/08, Phy Prabab <phyprabab@yahoo.com> wrote:
> Hello,
>
> I need a small bit of help, I am playing with Logger class and ran into a small problem I am not sure how to solve. Namely, I was interested in command line setting of the logging level, however, the passed argument is not accepted as a method name nor can I figure out how to get the arg "coherced" to a string prior to evaluation of the method call. Here is my code:
>
> when "--debug"
> if(DEBUG_LEVELS.include?(arg))
> mylog.level = Logger::arg.to_s
> ^^^^^^^^^^^^
> else
> puts " "Debug level can be one of DEBUG, INFO, WARN, ERROR, or FATAL."
> .....

Logger#level actually takes an integer. Maybe something like this:

if Logger::Severity.const_defined?(arg)
mylog.level = Logger::Severity.const_get(arg)
else
puts "Debug level must be one of #{Logger.Severity.constants.join(',')."
end

--
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denh...