From: John Legate <jl2351@...>
Date: 2006-09-13T13:13:43+09:00
Subject: Re: Newbie Alert

D'OH!

I mean, thanks very much to all of you who helped me solve this problem. 
I'm also kind of new at searching for answers on a Help Forum like this, 
and I'm pleasantly surprised and impressed with how quickly the answer 
can be found in this venue.



1337p337 wrote:
> This is actually easy to fix.  '+' is an undefined method for
> nil:Nilclass, which means that the super on line 22 is returning nil.
> 'super' refers to the to_s of the parent class which is, Song#to_s:
> 
>> 01      class Song
> ...
>> 07        def to_s
>> 08          puts "Song: #{@name}--#{@artist} (#{@duration})"
>> 09        end
>> 10      end
> 
> The problem is the 'puts'.  puts prints a string and a "\n" to
> standard out and returns nil.  You actually don't usually want to_s to
> print anything, so if you change Song#to_s to read
> 	def to_s
> 		"Song: #{@name}--#{@artist} (#{@duration})"
> 	end
> That will fix the bug, but your program won't print anything, because
> aSong.to_s will just return a string (which is what you want).  So
> you'll need to change lines 13 and 14:
> 
>> 13      print "aSong.to_s ==> "
>> 14      aSong.to_s
> 
> to
> 	print "aSong.to_s ==> " + aSong.to_s + "\n"
> or
> 	puts "aSong.to_s ==> #{aSong.to_s}"
> and do something similar with lines 26 and 27.


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