Support collection objects when using outputs from another Terraform resource

[rparmer]

Using outputs from one Terraform resource as inputs to another Terraform resource works great when outputted reference is a string. However it seems to be interpreting collections (lists, maps and objects) as strings too. For example if my parent Terraform outputs a list of strings

output "testing" {
  value = ["one", "two"]
}

and the child Terraform requires a list of strings

variable "testing" {
  type = list(string)
}

the child Terraform will blow up with Invalid value for input variable ... list of string required. I can view the output and verify the secret is storing the value correctly, but the generated.auto.tfvars.json is converting the array to a string

{...,"testing":"[\"one\",\"two\"]"}

I've been able to get around this by using the terraform_remote_state data lookup. But it would be nice if the controller could support these types of output references.

[chanwit]

Thank you for reporting this @rparmer !!