From: Bob Showalter <showaltb@...>
Date: 2007-06-26T22:03:57+09:00
Subject: Re: I need some help clarifying issues with YAML and hashes

On 6/26/07, Frank Church <vfcforums@gmail.com> wrote:
>
> The code below, config.yml and testvars.rb are supposed to created some
> arrays and hashes.

Your YAML is all hashes; there are no arrays.

>
> When I assign the directory1 and directory2 hashes directly into
> dirArray :
>
> dirname.each  { | k |  dirArray = k }

dirname is a Hash, with two entries that are themselves hashes. When
you call each() on a Hash, you get a 2-element (key, value) array. So
k is an array, not a hash.

What are you trying to do?

>
> dirArray doesn't contains the keys "directory1" and "directory2", which
> is what I expect
>
> but when I assign them via key = value
>
> dirname.each  { | k |  k.each {| l, m |  dirArray[l]=m } }
>
> dirArray contains the keys "directory1" and "directory2"

Yes, given what k is.

>
> I know my grasp of ruby semantics is not up to scratch yet, but is it a
> YAML issue or a Ruby issue?

I'm guessing it's related to your misconception of what the YAML is
actually representing.

Use some calls to p() to dump some of these structures so you can see
what you're dealing with.

>
>
>
> config4.yml
> =============
>
> directories      :
>     directory1   :
>        directory : /thisdirectory/yada/yada/yada
>        archivename : archivename01
>        configdir : configdir01
>        workdir   : workingdir01
>        logsdir : logsdir01
>
>     directory2   :
>        directory : /thisdirectory/yada2/yada2/yada2
>        archivename : archivename02
>        configdir : configdir02
>        workdir   : workingdir02
>        logsdir : logsdir02
>
>
>
> Code - testvars4.rb
> =============
>
> require 'yaml'
>
> config = YAML::load(File.open('config4.yml'))
>
> puts "assign via hash directly\n"
> puts ""
>
> dirArray = Hash.new
> config["directories"].each  { | dirname |
> puts ""
>
> dirname.each  { | k |  dirArray = k }
>
> puts "dirArray elements start = \n"
> puts ""
> dirArray.each { | l, m | puts "#{l} => #{m}" }
> puts ""
> puts "dirArray elements end= \n"
>
> }
> puts ""
> puts "assign via | key = val | \n"
> puts
>
> dirArray = Hash.new
> config["directories"].each  { | dirname |
>
> dirname.each  { | k |  k.each {| l, m |  dirArray[l]=m } }
>
> puts "dirArray elements start = \n"
> puts ""
> dirArray.each { | l, m | puts "#{l} => #{m}" }
> puts ""
> puts "dirArray elements end= \n"
> puts ""
> }
>
>
> Output
> ==========
>
> assign via hash directly
>
>
> dirArray elements start =
>
> directory => /thisdirectory/yada/yada/yada
> configdir => configdir01
> workdir => workingdir01
> archivename => archivename01
> logsdir => logsdir01
>
> dirArray elements end=
>
> dirArray elements start =
>
> directory => /thisdirectory/yada2/yada2/yada2
> configdir => configdir02
> workdir => workingdir02
> archivename => archivename02
> logsdir => logsdir02
>
> dirArray elements end=
>
>
> assign via | key = val |
>
> dirArray elements start =
>
> directory => /thisdirectory/yada/yada/yada
> configdir => configdir01
> archivename => archivename01
> workdir => workingdir01
> logsdir => logsdir01
> directory1 =>
>
> dirArray elements end=
>
> dirArray elements start =
>
> directory => /thisdirectory/yada2/yada2/yada2
> configdir => configdir02
> archivename => archivename02
> workdir => workingdir02
> logsdir => logsdir02
> directory1 =>
> directory2 =>
>
> dirArray elements end=
>
> --
> Posted via http://www.ruby-forum.com/.
>
>