# problems iterating in RUBY while extracting info from YAML, Pls help!

**URL:** <https://community.unix.com/t/problems-iterating-in-ruby-while-extracting-info-from-yaml-pls-help/215129>\
**Category:** Programming\
**Created:** [October 4, 2008, 10:42am UTC](https://community.unix.com/t/problems-iterating-in-ruby-while-extracting-info-from-yaml-pls-help/215129 "2008-10-04T10:42:49Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![wrapster](https://community.unix.com/letter_avatar/wrapster/32/6_449c533f586939b6e5f246632a46421f.png) [@wrapster](https://community.unix.com/u/wrapster)\
**Post date:** [October 4, 2008, 10:42am UTC](https://community.unix.com/t/problems-iterating-in-ruby-while-extracting-info-from-yaml-pls-help/215129/1 "2008-10-04T10:42:49Z")

</div>

Hi all,  
I am stuck with a ruby script that extracts detials from yaml file and processes accordingly.  
the yaml file

```nohighlight
confivnic:
  device:
    vnic1:
      policy:
      - L2
      mode: active
    vnic2:
      policy:
      - L3
      - L4
      mode: active
  type: aggr

notsoconfi:
  device:
    vnic9:
      policy:
      - L2
      - L3
      mode: "off"
    vnic3:
      policy:
      - L2
      - L3
      mode: active
    vnic6:
      policy:
      - L3
      - L2
      mode: active
  type: aggr

```

the ruby script

```nohighlight
require 'yaml'
yaml = YAML::load(File.open("testyaml.yaml"))

yaml.each do |name, option|
if option['type'] == "aggr"
names = Array.new
names.push name
while names.size != 0
key = yaml.keys.first
tpl = "dladm create-{{{type}}} {{{sets}}} {{{cmd}}}"
tpl.gsub! '{{{type}}}', yaml[key]['type']
tpl.gsub! '{{{cmd}}}', key
sets = ''
set_tpl = '-l {{{key}}} -L={{{mode}}} -P={{{policy}}} '
yaml[key]['device'].each do |device|
  set = set_tpl.dup
  set.gsub! '{{{key}}}', device[0]
  set.gsub! '{{{mode}}}', device[1]['mode']
  set.gsub! '{{{policy}}}', device[1]['policy'].join(',')
  sets << set
end
names.pop
end
tpl.gsub! '{{{sets}}}', sets
puts tpl.gsub(/\s+/,' ')
end
end

```

The o/p i get is like this

```nohighlight
dladm create-aggr -l vnic9 -L=off -P=L2,L3 -l vnic3 -L=active -P=L2,L3 -l vnic6 -L=active -P=L3,L2 notsoconfi
dladm create-aggr -l vnic9 -L=off -P=L2,L3 -l vnic3 -L=active -P=L2,L3 -l vnic6 -L=active -P=L3,L2 notsoconfi

```

but the yaml file has 2 names ,"confivnic" and "notsoconfi"  
This was written originally for just one module but for obvious reasons we had to change it. I tried all i knew but really not finding a way out.  
The things that i feel are creating errors are yaml.keys.first  
or the way iteration is done.

The o/p i want is similar to the shown one but instead of repeating the same one twice i want the other one to be displayed as well with the necessary changes.

Pls help

---

<div class="post-metadata">

**Author:** ![fpmurphy](https://community.unix.com/user_avatar/community.unix.com/fpmurphy/32/110_2.png) [@fpmurphy](https://community.unix.com/u/fpmurphy)\
**Post date:** [October 5, 2008, 2:38pm UTC](https://community.unix.com/t/problems-iterating-in-ruby-while-extracting-info-from-yaml-pls-help/215129/2 "2008-10-05T14:38:32Z")

</div>

Yes, one of your problems is the repeated calls to yaml.keys.first. (will always return 'notsoconfi')

The following code delivers the expected output:

```nohighlight
require 'yaml'

set_tpl = '-l {device} -L={mode} -P={policy} '

yaml = YAML::load(File.open("testyaml.yaml"))

yaml.each do |name, option|
   if option['type'] == "aggr"
      tpl = 'dladm create-{type} {sets} {cmd}'
      tpl.gsub! '{type}', option['type']
      tpl.gsub! '{cmd}', name

      sets = ""
      yaml[name]['device'].each do |device|
         set = set_tpl.dup
         set.gsub! '{device}', device[0]
         set.gsub! '{mode}', device[1]['mode']
         set.gsub! '{policy}', device[1]['policy'].join(',')
         sets << set
      end

      tpl.gsub! '{sets}', sets
      puts tpl.gsub(/\s+/,' ')
   end
end

```

```nohighlight
dladm create-aggr -l vnic9 -L=off -P=L2,L3 -l vnic3 -L=active -P=L2,L3 -l vnic6 -L=active -P=L3,L2 notsoconfi
dladm create-aggr -l vnic1 -L=active -P=L2 -l vnic2 -L=active -P=L3,L4 confivnic

```