problems with json_data and datasource

[jacobmw]

Affected Puppet, Ruby, OS and module versions/distributions

• Puppet: 6.0.5
• Ruby: 2.5.3
• Distribution: Debian 9/stretch
• Module version: 6.0.0

How to reproduce (e.g Puppet code you use)

$graphite_version = '0.9'
grafana_datasource { 'graphite.staging':
type => 'graphite',
url => $graphite_url,
access_mode => 'proxy',
is_default => true,
grafana_url => 'http://localhost:8080',
grafana_user => 'admin',
grafana_password => $admin_password,
grafana_api_path => '/api',
json_data => template('profile/grafana/datasources/graphite.json.erb')

graphite.json.erb = {
"graphiteVersion":"<%= @graphite_version -%>"
}

What are you seeing

Error: Failed to apply catalog: Parameter json_data failed on Grafana_datasource[graphite.staging]: json_data should be a Hash!

What behaviour did you expect instead

I expect the datasource to be added with the graphite version being set.

Output log

Any additional information you'd like to impart

If I comment out the json_data line, the catalog compiles and that datasource is added correctly, other than the graphite version is not being set (as I am not defining it outside of the erb