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Simple array.each do |x| question

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Hello, I am new to ruby and cannot understand why this code is not
working:

direction = doc.elements.each("doc:iso_10303_28/uos/IfcCartesianPoint")
{ |element| puts element.attributes["id"] }
# this produces [i1586,i1667,i1915,i2041,i2160]
result = []
direction.each do |z|
  n = direction[z].attribute["id"]
  result << n
end

This gives me the following error: Error: #<TypeError: C:/Program Files
(x86)/Google/Google SketchUp 8/Plugins/examples/one.rb:61:in `[]': can't
convert REXML::Element into Integer>

However when I use the following code, which to me seems to do exactly
the same thing in a less sophisticated manner, it works without issue:

direction = doc.elements.each("doc:iso_10303_28/uos/IfcCartesianPoint")
{ |element| puts element.attributes["id"] }
n=0
result = []
while n != direction.length
z = direction[n].attributes["id"]
result << z
n=n+1
end
#output - > ["i1586", "i1667", "i1915", "i2041", "i2160"]

Any ideas?

Addition info - Ruby 1.8.6.

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Posted via http://www.ruby-forum.com/.

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Simple array.each do |x| question "Kyle X." <haebooty@yahoo.com> - 2011-03-31 17:26 -0500
  Re: Simple array.each do |x| question Roger Braun <roger@rogerbraun.net> - 2011-03-31 17:35 -0500
    Re: Simple array.each do |x| question "Kyle X." <haebooty@yahoo.com> - 2011-03-31 17:59 -0500
      Re: Simple array.each do |x| question Gunther Diemant <g.diemant@gmx.net> - 2011-03-31 18:06 -0500
        Re: Simple array.each do |x| question "Kyle X." <haebooty@yahoo.com> - 2011-03-31 18:30 -0500
        Re: Simple array.each do |x| question "Kyle X." <haebooty@yahoo.com> - 2011-04-01 14:29 -0500
          Re: Simple array.each do |x| question "Kyle X." <haebooty@yahoo.com> - 2011-04-01 15:31 -0500
          Re: Simple array.each do |x| question "Kyle X." <haebooty@yahoo.com> - 2011-04-02 01:39 -0500
            Re: Simple array.each do |x| question 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-02 13:32 -0500
  Re: Simple array.each do |x| question 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-02 13:58 -0500
    Re: Simple array.each do |x| question "Kyle X." <haebooty@yahoo.com> - 2011-04-04 13:55 -0500
  Re: Simple array.each do |x| question "Kyle X." <haebooty@yahoo.com> - 2011-04-06 00:57 -0500

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