Hiera puppet lookup Puppet 3

hiera.yaml

---
:hierarchy:
  - common

:backends:
  - puppet

:puppet:
  datasource: data

modules_p3t_manifests_init.pp

# 2 tries... (1 at a time of course..)

class p3t  ( $somevar = '' )
class p3t  ( $somevar = hiera('somevar','') )

{
  notify { "test: $somevar": }
}

puppet_backend.rb

      def hierarchy(scope, override)
        begin
          data_class = Config[:puppet][:datasource] || "data"
        rescue
          data_class = "data"
        end
        
        # added Debug output here...
        Hiera.debug( " scope :#{scope}: " )
        Hiera.debug( " scope.resource :#{scope.resource}: " )
        Hiera.debug( " scope.resource.name :#{scope.resource.name}: " )

        calling_class = scope.resource.name.to_s.downcase
        calling_module = calling_class.split("::").first

server_output

# result of using class p3t  ( $somevar = '' ) 

Debug: Automatically imported p3t from p3t into production
Debug: hiera(): Hiera Puppet backend starting
Debug: hiera(): Looking up p3t::somevar in Puppet backend
Debug: hiera():  scope :#<Puppet::Indirector::Hiera::FakeScope:0x7f03abf1fdf0>: 
Debug: hiera():  scope.resource :#<struct #<Class:0x7f03abf22de8> name="fake">: 
Debug: hiera():  scope.resource.name :fake: 
Debug: hiera(): Looking for data in data::common
Debug: hiera(): Found data in class data::common
Debug: hiera(): Looking for data in fake::data
Debug: hiera(): Found data in class fake::data
Compiled catalog for pm3.lan.super-visions.com in environment production in 0.15 seconds


# and using class p3t  ( $somevar = hiera('somevar','') )

Debug: Automatically imported p3t from p3t into production
Debug: hiera(): Hiera Puppet backend starting
Debug: hiera(): Looking up p3t::somevar in Puppet backend
Debug: hiera():  scope :#<Puppet::Indirector::Hiera::FakeScope:0x7f79f7558390>: 
Debug: hiera():  scope.resource :#<struct #<Class:0x7f79f7560b58> name="fake">: 
Debug: hiera():  scope.resource.name :fake: 
Debug: hiera(): Looking for data in data::common
Debug: hiera(): Found data in class data::common
Debug: hiera(): Looking for data in fake::data
Debug: hiera(): Found data in class fake::data
Debug: hiera(): Looking up somevar in Puppet backend
Debug: hiera():  scope :Scope(Class[P3t]): 
Debug: hiera():  scope.resource :Class[P3t]: 
Debug: hiera():  scope.resource.name :P3t: 
Debug: hiera(): Looking for data in data::common
Debug: importing '/etc/puppet-modules/p3t/manifests/data.pp' in environment production
Debug: hiera(): Looking for data in p3t::data
Compiled catalog for pm3.lan.super-visions.com in environment production in 0.16 seconds