YAML as File resource template Error , "can't convert Hash to String"

[treydock]

Using exported resources I'm trying to have a host export a File resource generated from a yaml template, to another host.  The host that gets the exported resource is throwing errors like this

err: Failed to apply catalog: Parameter content failed: Munging failed for value {"parameters"=>{"macaddress_p2p1"=>"00:15:17:80:5A:3E", "macaddress_p2p2"=>"00:15:17:80:5A:3F", "macaddress_eth0"=>"00:1E:C9:55:12:C7", "macaddress_eth1"=>"00:1E:C9:55:12:C9", "operatingsystem"=>"CentOS", "serialnumber"=>"", "interfaces"=>"eth0,eth1,lo,p2p1,p2p2", "fqdn"=>"<snip>", "ipaddress_p2p1"=>"", "ipaddress_p2p2"=>"", "uuid"=>"", "ipaddress_eth0"=>"", "ipaddress_eth1"=>"<snip>", "productname"=>"", "operatingsystemrelease"=>"6.3"}, "name"=>"<snip>"} in class content: can't convert Hash into String

Here is the parts of the module...

class racktables::export (

  $site,

  $yamls_dir  = 'UNSET'

) inherits racktables::params {

  $yamls_dir_REAL = $yamls_dir ? {

    'UNSET'   => "${conf_dir}/${site}/yamls",

    default   => $yamls_dir,

  }

  @@file { "racktables_host_${::hostname}.yaml":

    content   => template('racktables/host.yaml.erb'),

    path      => "${yamls_dir_REAL}/${::hostname}.yaml",

    tag       => "host_yaml_for_${site}",

  }

}

define racktables::instance (

...

) {

<snip>

  File <<| tag == "host_yaml_for_${name}" |>> {

    require   => File[$yaml_exports_REAL],

  }

<snip>

}

Template...

# cat templates/host.yaml.erb

--- 

name: "<%= scope.lookupvar('::hostname') %>"

parameters: 

  interfaces: "<%= scope.lookupvar('::interfaces') %>"

  fqdn: "<%= scope.lookupvar('::fqdn') %>"

  operatingsystemrelease: "<%= scope.lookupvar('::operatingsystemrelease') %>"

  operatingsystem: "<%= scope.lookupvar('::operatingsystem') %>"

  productname: ""

  uuid: ""

  serialnumber: ""

<% scope.lookupvar('::interfaces').split(',').each do |interface| -%>

<% unless interface.eql? "lo" -%>

  ipaddress_<%= interface %>: "<%= scope.lookupvar("::ipaddress_#{interface}") %>"

  macaddress_<%= interface %>: "<%= scope.lookupvar("::macaddress_#{interface}") %>"

<% end -%>

<% end -%>

Is there some catch to using a YAML file for the template content?  Would it be better to use Ruby DSL for the racktables::export class and generate a hash -> sort -> to_yaml and have that be set as the content?

Thanks

- Trey