Rails - Feb 2013 - Ruby pack - TypeError: can't convert String into Integer

I am getting TypeError: can''t convert String into Integer, I found 
duplicate answer too, but I am facing this error for ''pack''.

Other confusion is, it is working fine with ruby 1.8.7, not with ruby 
1.9.3, here is the code

irb(main):003:0> length=nil
=> nil
irb(main):004:0> token_string ||=
["A".."Z","a".."z","0".."9"].collect
{
|r| r.to_a }.join + %q(!$:*)
=>
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!$:*"
irb(main):005:0> token =  (0..(length ? length : 60)).collect { 
token_string[rand( token_string.size)]}.pack("c*")
TypeError: can''t convert String into Integer
    from (irb):5:in `pack''
    from (irb):5
    from /home/appandya/.rvm/rubies/ruby-1.9.3-p374/bin/irb:13:in
`<main>''
irb(main):006:0>

Ant Ideas?

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On Monday, February 25, 2013 6:47:20 PM UTC,
onali...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
>
> Other confusion is, it is working fine with ruby 1.8.7, not with ruby 
> 1.9.3, here is the code
>  
>
irb(main):003:0> length=nil
> => nil
> irb(main):004:0> token_string ||=
["A".."Z","a".."z","0".."9"].collect
{
> |r| r.to_a }.join + %q(!$:*)
> =>
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!$:*"
> irb(main):005:0> token =  (0..(length ? length : 60)).collect { 
> token_string[rand( token_string.size)]}.pack("c*")
> TypeError: can''t convert String into Integer
>     from (irb):5:in `pack''
>     from (irb):5
>     from /home/appandya/.rvm/rubies/ruby-1.9.3-p374/bin/irb:13:in
`<main>''
> irb(main):006:0>
>
>
>
I''ve no idea what you''re trying to do here, but the underlying
cause is
that on ruby 1.8.7:

''123''[0] #=> 49, the byte value of the first character

but on ruby 1.9.3

''123''[0] #=> ''1'', a string of length 1
beginning at the specified offset

Fred 

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