Terraform : Invalid dynamic for_each value => Cannot use a set of object value in for_each. An iterable collection is required - amazon-web-services

Question

In terraform version 1.1.9 am facing the below issue while doing terraform apply.
Help me to fix how this for_each can be done without error.
rke_nodes values sample will be :
# Outputs
output "rancher_nodes" {
  value = [
        for instance in flatten([[aws_instance.node_all], [aws_instance.node_master], [aws_instance.node_worker]]): {
    public_ip  = instance.public_ip
    private_ip = instance.private_ip
    hostname   = instance.id
    user       = var.node_username
    roles      = split(",", instance.tags.K8sRoles)
    ssh_key    = file(var.ssh_key_file)
    }
  ]
  sensitive = true
}
I have variable.tf :
variable "rke_nodes" {
type = list(object({
public_ip = string
private_ip = string
hostname = string
roles = list(string)
user = string
ssh_key = string
}))
description = "Node info to install RKE cluster"
}
main.tf :
# Provision RKE cluster on provided infrastructure
resource "rke_cluster" "rancher_cluster" {
cluster_name = var.rke.cluster_name
dynamic nodes {
for_each = var.rke_nodes
content {
address = nodes.value.public_ip
internal_address = nodes.value.private_ip
hostname_override = nodes.value.hostname
user = nodes.value.user
role = nodes.value.roles
ssh_key = nodes.value.ssh_key
}
}
upgrade_strategy {
drain = false
max_unavailable_controlplane = "1"
max_unavailable_worker = "10%"
}
kubernetes_version = var.rke.kubernetes_version
}
I got error when terraform apply :
╷
│ Error: Invalid dynamic for_each value
│
│ on .terraform/modules/rke-cluster/main.tf line 6, in resource "rke_cluster" "rancher_cluster":
│ 6: for_each = var.rke_nodes
│ ├────────────────
│ │ var.rke_nodes has a sensitive value
│
│ Cannot use a list of object value in for_each. An iterable collection is required.
Actual Value when apply it can be list in sometimes:
- nodes {
- address = "65.2.140.68" -> null
- hostname_override = "i-0d5bf5f22fb84f5d4" -> null
- internal_address = "10.30.8.120" -> null
- labels = {} -> null
- role = [
- "controlplane",
- "etcd",
- "worker",
] -> null
- ssh_agent_auth = false -> null
- ssh_key = (sensitive value)
- user = (sensitive value)
}

Answer 1

You don't need index. It just should be:
for_each = var.rke_nodes
Note: This works only for dynamic blocks. If you use for_each in resource blocks, this form of for_each (list of maps) will not work.