ruby - Iterating over an array attribute in Chef -

i using chef provisioning create machines in aws. when creating machine, add attribute array of json files. in recipes run, want iterate on array , create template file on machine. machine gets provisioned when iterating on array attribute, error says:

undefined method `each' nil:nilclass

i tried looking @ node file got created on server , guess what? array of json files added node file! i'm not sure why keeps throwing error. ideas?

the code sample follows:

machines.rb

    def get_cluster_json(domain_number)       clusters = []       @@environment_template['domains'][domain_number]['clusters'].each |cls|         clusters << json.parse(::file::read(new_resource.template_path + cls))       end        return clusters     end  provisioning_xyz_machine "test-admin"             tag "usage:keep"             attribute "clusters_json", get_cluster_json(domain_counter)             recipe admin_role             machine_options get_machine_options()             ohai_hints ohai_hints             action $provisioningaction           end 

admin_role.rb

managed_details = []    node["clusters_json"].each |cls|       managed_details << "#{cls['cluster']['name']}"    end 

log

* template[/tools/appsw/appsautm/config/intfin_config] action create[2015-05-12t10:24:13-07:00] info: processing template[/tools/appsw/appsautm/config/intfin_config] action create (xyz-environment-cookbook::build_admin line 32)  ================================================================================ error executing action `create` on resource 'template[/tools/appsw/appsautm/config/intfin_config]' ================================================================================  chef::mixin::template::templateerror ------------------------------------ undefined method 'each' `nil:nilclass`  resource declaration: --------------------- # in /var/chef/cache/cookbooks/xyz-environment-cookbook/recipes/build_admin.rb    32: template "/tools/appsw/appsautm/config/#{env_name}_config"   33:   source "#{env_name}_config.conf.erb"   34:   cookbook "appsautm-template"   35:   owner node['xyz-dir-library']['user']   36:   mode "0755"   37:           38:   variables({        39:     :admin_servers=> admin_details,        40:     :managed_servers=> managed_details        41:   })        42: end        43:       compiled resource: ------------------ # declared in /var/chef/cache/cookbooks/xyz-environment-cookbook/recipes/build_admin.rb:32:in `from_file' 

the error appears in template, not cookbook. in fact, appears unrelated files posted. i'd need see #{env_name}_config.conf.erb file , build_admin.rb file in order more that.