How do i define variable within a template cookbook - ruby

Question

I am trying to edit the existing user_management cookbook on the supermarket to include sudoers. I seem to be having problems properly defining the sudoers_groups variable within the template.
Link to default cookbook
https://github.com/FFIN/user_management/blob/master/recipes/default.rb
Here is what my vault looks like.
knife vault show testusers john
action: create
comment: John Smith
dbpass: secret
gid: john
id: john
password: $1$d$xKNtrFrifo6f7tLFW1xh750
shell: /bin/bash
sudo_pwdless: true
sudoer: false
sudoer_group:
command: ALL
name: admin
sudo_pwdless: false
command: ALL
name: wheel
sudo_pwdless: false
command: ALL
name: sysadmin
sudo_pwdless: true
uid: 1002
username: john`
Here is the template section of my recipe
sudoer_users = Array.new()
if user['sudoer']
command = user['command'] ? user['command'] : 'ALL'
hash = { :uname => user['username'], :command => command, :sudo_pwdless => user['sudo_pwdless'] }
sudoer_users.push(hash)
end
template "/etc/sudoers" do
source 'sudoers.erb'
mode '0440'
owner 'root'
group node['root_group']
variables(
:sudoers_users => sudoer_users,
:sudoers_groups => node[:testcookbook][:testusers][:sudoer_group]
)
only_if { sudoer_users }
end
When i run the recipe, i get the following error
Recipe Compile Error in /var/chef/cache/cookbooks/newuser/recipes/default.rb ============================================. ==================================== NoMethodError
-------------`
undefined method [] for nil:NilClass
template "/etc/sudoers" do
61: source 'sudoers.erb'
62: mode '0440'
63: owner 'root'
64: group node['root_group']
65: variables(
66: :sudoers_users => sudoer_users,
67>> :sudoers_groups => node[ :testcookbook][ :testusers][ :sudoer_group]
68: )
69: only_if { sudoer_users }
70: end
My question is how do i go about defining the sudoers_group variable so that it only iterates the sudoer_group section within the vault?

Answer 1

Unfortunately Ruby doesn't give us enough info to check which is undefined, but either node[:testcookbook] or node[:testcookbook][:testusers] is unset/undefined. Double check where you are setting the sudoer_group value because it is likely either misformatted or not uploaded to the Chef Server.

Answer 2

Here is what i did to finally resolve the issue.
I added the following as part of my variables in attributes/default.rb.
default['testcookbook']['testusers']['sudoer_group'] = [
{"name" => "admin", "sudo_pwdless" => false, "command" => "ALL"},
{"name" => "wheel", "sudo_pwdless" => false, "command" => "ALL"},
{"name" => "sysadmin", "sudo_pwdless" => true, "command" => "ALL"}
]`