ruby and nested loops

Question

Hi I'd like some help on how to code this in erb in puppet, basically I have

server::actionhost { 'details':
    servername[ 'felix', 'washington', ],
    ipa [ '192.168.43.5', '192.168.43.11', ],
    enviro [ 'prod', 'uat', ],
}

I now want to print this out to a file with each respective element from each array in one line, i.e the output from the template file in my class should be like:

felix 192.168.43.5 prod
washington 192.168.43.11 uat

When I attempted this I wrote the following code in my template file:

<% servername.each do |name| -%>
<% ipa.each do |ip| -%>
<% enviro.each do |env| -%>
<%= name %> <%= ip %> <%= env %>
<% end -%>
<% end -%>
<% end -%>

but what I get is recursive prints of netmask and ipa instead of a print from each array and then move to the next array element.

Would appreciate some guidance on how to accomplish the correct output?

Thanks Dan

chandank · Accepted Answer · 2013-08-07 19:13:55Z

2

How about trying something like dictionary. A similar approach worked for me hope it is helpful to you. My problem was, I had different variables and each should have a different value or parameters.

Define the variable like

 $file_threshold = {
          'received' => '10',
          'doneJobs' => '20',
          'recvq'    => '30',
          'sendq'    => '40',
          'doneq'    => '50',
          'docq'     => '60',}

In the template file

<%  @file_threshold.each do |key,value| -%>

cmd = check_file.sh <%=  key %>  <%= value%>

<% end -%>

Out:

....
cmd = check_file.sh doneq 50
....

answered Aug 7, 2013 at 19:13

chandank

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Albert Turri · Accepted Answer · 2013-02-14 20:03:59Z

1

One can execute Ruby code (the following is Ruby code) inside an .erb, if need be. The main things in this case are: defining a multi-dimensional array and using Ruby's transpose method for arrays.

<% details = [servername, ipa, env]; transposed = details.transpose; transposed.each {|x| print x.at(0), " ", x.at(1), " ", x.at(2), "\n"}  %>

edited Feb 14, 2013 at 20:03

answered Feb 14, 2013 at 1:01

Albert Turri

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1 Comment

Chris Heald Over a year ago

I'd just use: <%= [servername, ipa, env].transpose.map {|x| "%s %s %s" % x }.join("\n") %>

kclair · Accepted Answer · 2013-04-08 22:36:56Z

0

This is kind of dicey because it assumes that you are absolutely sure that your arrays line up, but:

...<% servername.each_with_index do |name, i| -%>
.....<%= name %> <%= ipa[i] %> <%= enviro[i] %>
...<% end %>

(please ignore the ... i couldn't get the template code to appear correctly otherwise!)

answered Apr 8, 2013 at 22:36

kclair

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