Using a variable as a method name?

ruby-talk
1

Hello,

I need a bit of help understanding how to use a
variable as a name for a method call. Forgive me
trying to explains this, I am new at all this. In the
code listed, I am tring to set the debugging level of
the Logger class, however, the variable in question is
not being sustituted prior to interpreting the method
call.

when "--debug"
  if($DEBUG_LEVELS.include?(arg))
    mylog.level = Logger::arg
                  ^^^^^^^^^^^
  else
    puts "Debug level can be one of: DEBUG, INFO,
WARN, or ERROR"
    dis_help
  end

This causes Ruby to spit out that there is no method
called arg which is correct. So how do I get arg to
be substituted to the value rather than the var name?
I tried dereferencing and using the it within a string
(okay, a dumb idea). Any way, any help will be much
appreciated!

TIA!
Phy

···

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2

Try Logger.send(arg)

···

On Sat, Feb 23, 2008 at 8:18 PM, Phy Prabab <phyprabab@yahoo.com> wrote:

Hello,

I need a bit of help understanding how to use a
variable as a name for a method call. Forgive me
trying to explains this, I am new at all this. In the
code listed, I am tring to set the debugging level of
the Logger class, however, the variable in question is
not being sustituted prior to interpreting the method
call.

when "--debug"
if($DEBUG_LEVELS.include?(arg))
   mylog.level = Logger::arg
                 ^^^^^^^^^^^
else
   puts "Debug level can be one of: DEBUG, INFO,
WARN, or ERROR"
   dis_help
end

This causes Ruby to spit out that there is no method
called arg which is correct. So how do I get arg to
be substituted to the value rather than the var name?
I tried dereferencing and using the it within a string
(okay, a dumb idea). Any way, any help will be much
appreciated!

TIA!
Phy

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3

What is the /type/ of arg?

If it's a Proc, you might try arg.call().

If you're trying to do it via string, look into eval.

Jay Fields has some thoughts:

I seem to remember seeing a better reference, only I can't recall by whom or
where.

Regards,
Sam

···

On Sat, Feb 23, 2008 at 7:18 PM, Phy Prabab <phyprabab@yahoo.com> wrote:

This causes Ruby to spit out that there is no method
called arg which is correct. So how do I get arg to
be substituted to the value rather than the var name?
I tried dereferencing and using the it within a string
(okay, a dumb idea). Any way, any help will be much
appreciated!

4

Hi,

···

On Sun, Feb 24, 2008 at 12:23 PM, Corey Haines <coreyhaines@gmail.com> wrote:

Try Logger.send(arg)

In the case of Rails, `arg' should also be lower case. Is it Logger.warn or
.warning?

Logger.send(arg.downcase)

Arlen