fix: change count for for_each into ram_principal_association resourc…

…e and adjust the output related to this resource

main.tf

@@ -161,9 +161,9 @@ resource "aws_ram_resource_association" "this" {
 }
 
 resource "aws_ram_principal_association" "this" {
-  count = var.create_tgw && var.share_tgw ? length(var.ram_principals) : 0
+  for_each = var.create_tgw && var.share_tgw ? toset(var.ram_principals) : []
 
-  principal          = var.ram_principals[count.index]
+  principal          = each.value
   resource_share_arn = aws_ram_resource_share.this[0].arn
 }
 

outputs.tf

@@ -96,5 +96,5 @@ output "ram_resource_share_id" {
 
 output "ram_principal_association_id" {
   description = "The Amazon Resource Name (ARN) of the Resource Share and the principal, separated by a comma"
-  value       = try(aws_ram_principal_association.this[0].id, "")
+  value       = [for k, v in aws_ram_principal_association.this : v.id]
 }