yaql_rg

parameters:
  items:
    type: comma_delimited_list
    default:
    - zone-1
    - zone-2
    - zone-3

resources:

  # passing as param with casting says
  # ERROR: Property error: : resources.rg.properties.resource_def: : invalid literal for int() with base 10: '%index%'
  rg:
    type: OS::Heat::ResourceGroup
    properties:
      count: 3
      resource_def:
        type: OS::Heat::Value
        properties:
          value:
            yaql:
              expression:
                $.data.items.cycle().take(int($.data.idx))
              data:
                items:
                  get_param: items
                idx:
                  str_replace:
                    template: '%index%'
                    params: {}


  # passing directly
  rg:
    type: OS::Heat::ResourceGroup
    properties:
      count: 3
      resource_def:
        type: OS::Heat::Value
        properties:
          value:
            yaql:
              expression:
                $.data.items.cycle().take(%index%)
              data:
                items:
                  get_param: items

  # This prints
  # $.data.items.cycle().take(0)
  # $.data.items.cycle().take(1)
  # $.data.items.cycle().take(2)
  rg_str:
    type: OS::Heat::ResourceGroup
    properties:
      count: 3
      resource_def:
        type: OS::Heat::Value
        properties:
          value: >-
            $.data.items.cycle().take(%index%)