How to fetch id of a variable using name in terraform? - terraform

Question

I have a terraform resource in which I am trying to make a subnet_id variable dynamic. So I have varibles defined below in which subnet_id = "worker-subnet-1". I want to pass the name of the subnet and fetch the subnet id as I have multiple subnets. How can I do that.
resource "oci_containerengine_node_pool" "node_pool" {
for_each = var.nodepools
cluster_id = oci_containerengine_cluster.cluster[0].id
compartment_id = var.compartment_id
depends_on = [oci_containerengine_cluster.cluster]
kubernetes_version = var.cluster_kubernetes_version
name = each.value["name"]
node_config_details {
placement_configs {
availability_domain = var.availability_domain
subnet_id = oci_core_subnet.each.value["subnet_name"].id
}
size = each.value["size"]
}
node_shape = each.value["node_shape"]
node_shape_config {
#Optional
memory_in_gbs = each.value["memory"]
ocpus = each.value["ocpus"]
}
node_source_details {
image_id = each.value["image_id"]
source_type = "IMAGE"
}
ssh_public_key = file(var.ssh_public_key_path)
}
These are my variables:
nodepools = {
np1 = {
name = "np1"
size = 3
ocpus = 8
memory = 120
image_id = "test"
node_shape = "VM.Standard2.8"
subnet_name = "worker-subnet-1"
}
np2 = {
name = "np2"
size = 2
ocpus = 8
memory = 120
image_id = "test"
node_shape = "VM.Standard2.8"
subnet_name = "worker-subnet-1"
}
}
any suggestions?
resource "oci_core_subnet" "snet-workers" {
cidr_block = lookup(var.subnets["snet-workers"], "subnet_cidr")
compartment_id = var.compartment_id
vcn_id = oci_core_virtual_network.base_vcn.id
display_name = lookup(var.subnets["snet-workers"], "display_name")
dns_label = lookup(var.subnets["snet-workers"], "dns_label")
prohibit_public_ip_on_vnic = true
security_list_ids = [oci_core_security_list.private_worker_nodes.id]
route_table_id = oci_core_route_table.rt-nat.id
}

Answer 1

You have to use like below where change <local resource name> to the name you have given for your resource
subnet_id = oci_core_subnet.<local resource name>[each.value.subnet_id].id