Puppet users - Apr 2010 - Some advice on using hashes in ERB templates needed

Hi all,

I''m working with Puppet version 0.25.4 and as far as I have read in
this list it''s not possible to access complex data structures from
within an ERB template, instead serializing is needed. Due to my lack of Ruby
knowledge I didn''t find the right solution for this problem:

Given this Yaml (coming out of an external node definition):

---
classes:
 - vim
 - users
 - templates_eval::testvars
environment: test
parameters:
  workers:
    bo-01-010101:
	    type: ajp13
	    host: myhostname.net

Now I want to iterate over the ''workers'' inside the ERB
template and tried (among others) this:

     16 <% workers.each do |worker| -%>
     17 <%= @m_worker = Marshal.load(worker) %>
     18 worker.<%= worker %>.type=<%= @m_worker.type %>
     ...
     25 
     26 <% end -%>

Accessing the ''workers'' hash works, but accessing
''worker.type'' and ''worker.host'' not. I guess
I will have to learn Ruby now ;-) but in the meantime, can some Ruby expert
please tell me how to do this? Thanks a lot in advance!

Bernd

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>
> Now I want to iterate over the ''workers'' inside the ERB
template and tried (among others) this:
>
>     16 <% workers.each do |worker| -%>
>     17 <%= @m_worker = Marshal.load(worker) %>
>     18 worker.<%= worker %>.type=<%= @m_worker.type %>
>     ...
>     25
>     26 <% end -%>
>
> Accessing the ''workers'' hash works, but accessing
''worker.type'' and ''worker.host'' not. I guess
I will have to learn Ruby now ;-) but in the meantime, can some Ruby expert
please tell me how to do this? Thanks a lot in advance!
>
> Bernd
>
worker[''type''] and worker[''host''] is the way
the Ruby should look.

--Michael

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On Fri, Apr 30, 2010 at 9:18 AM, Michael DeHaan <michael@puppetlabs.com>
wrote:
>>
>> Now I want to iterate over the ''workers'' inside the
ERB template and tried (among others) this:
>>
>>     16 <% workers.each do |worker| -%>
>>     17 <%= @m_worker = Marshal.load(worker) %>
>>     18 worker.<%= worker %>.type=<%= @m_worker.type %>
>>     ...
>>     25
>>     26 <% end -%>
>>
>> Accessing the ''workers'' hash works, but accessing
''worker.type'' and ''worker.host'' not. I guess
I will have to learn Ruby now ;-) but in the meantime, can some Ruby expert
please tell me how to do this? Thanks a lot in advance!
>>
>> Bernd
>>
>
> worker[''type''] and worker[''host''] is
the way the Ruby should look.
>
Also, you shouldn''t need Marshal.load and the @m_worker either.

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Following your advice, the server reports this error:

err: Failed to parse template templates_eval/worker.properties.erb: (eval):17:in
`[]''cannot convert String into Integer at
/etc/puppet/modules/templates_eval/manifests/init.pp:68 on node mynode.net

This is the code I''ve used:

     16 <% workers.each do |worker| -%>
     17 worker.<%= worker %>.type=<%= worker[''type'']
%>
     18 worker.<%= worker %>.host=<%= worker[''host'']
%>
     ...
     24 
     25 <% end -%>

I''ve already tried this before and as far as I''ve read in some
other posts here, this is still not supported by Puppet in the current version.
Only some kind of marshalling workaround might be possible. But I don''t
know how to accomplish marshalling inside an ERB template. Any ideas?

Bernd
> -----Ursprüngliche Nachricht-----
> Von: puppet-users@googlegroups.com [mailto:puppet-
> users@googlegroups.com] Im Auftrag von Michael DeHaan
> Gesendet: Freitag, 30. April 2010 15:20
> An: puppet-users@googlegroups.com
> Betreff: Re: [Puppet Users] Some advice on using hashes in ERB
> templates needed
> 
> On Fri, Apr 30, 2010 at 9:18 AM, Michael DeHaan
> <michael@puppetlabs.com> wrote:
> >>
> >> Now I want to iterate over the ''workers'' inside
the ERB template and
> tried (among others) this:
> >>
> >>     16 <% workers.each do |worker| -%>
> >>     17 <%= @m_worker = Marshal.load(worker) %>
> >>     18 worker.<%= worker %>.type=<%= @m_worker.type %>
> >>     ...
> >>     25
> >>     26 <% end -%>
> >>
> >> Accessing the ''workers'' hash works, but
accessing ''worker.type'' and
> ''worker.host'' not. I guess I will have to learn Ruby now
;-) but in the
> meantime, can some Ruby expert please tell me how to do this? Thanks a
> lot in advance!
> >>
> >> Bernd
> >>
> >
> > worker[''type''] and worker[''host'']
is the way the Ruby should look.
> >
> 
> Also, you shouldn''t need Marshal.load and the @m_worker either.
> 
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