Sorting a YAML output in an ERB template

In an ERB template used by Puppet, I'm trying to sort a YAML output of a hash to make sure it's always the same output.

Here is what I have so far (in mytest/templates/hash.erb ):

<%=
  class MyHash < Hash
    def to_yaml( opts = {} )
      YAML::quick_emit( self, opts ) do |out|
        out.map( taguri, to_yaml_style ) do |map|
          keys.sort.each do |k|
            v = self[k]
            map.add( k, v )
          end
        end
      end
    end
  end
  myScope = scope.to_hash.reject{|k,v| k.to_s =~ /(uptime|timestamp|free)/}
  MyHash[myScope].to_yaml
-%>

which yields:

$ puppet apply -e 'include mytest' --modulepath .
Failed to parse template mytest/hash.erb:
  Filepath: /usr/lib/ruby/1.8/yaml.rb
  Line: 391
  Detail: wrong argument type String (expected Data)
 at /home/rpinson/bas/puppet/mytest/manifests/init.pp:3 on node foo.example.com

This is the content of mytest/manifests/init.pp :

class mytest {
  notify { 'toto':
    message => template('mytest/hash.erb'),
  }
}

I can't seem to understand where this type Data comes from, and how to cast the parameters properly in order to get this to work…

---

It turns out, the source of problem is ZAML, YAML replacement which Puppet uses for performance purposes.

It can be proved by testing this erb -template without Puppet .

I'm pretty sure it will work.

I'm investigating to allow to work them together.

UPDATE:

ZAML.dump(MyHash[myScope]) # instead of MyHash[myScope].to_yaml

This may heal problem, at least it does my one that really similar.

链接地址: http://www.djcxy.com/p/61426.html

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