How to access parent resource block value in the child resource block? - azure

Question

Here I want to create service bus with queue,topic & subcription in azure , so I want to access parent resource block value of topic_id with contains for_each loop
resource from child block of code which its already having for_each?
"azurerm_servicebus_topic" "default" {
resource "azurerm_servicebus_namespace" "default" {
name = var.resource_name
location = data.azurerm_resource_group.current.location
resource_group_name = data.azurerm_resource_group.current.name
sku = var.sku
capacity = var.capacity
tags = var.resource_tags
lifecycle {
ignore_changes = [
tags,
location
]
}
}
resource "azurerm_servicebus_queue" "default" {
for_each = toset(var.queues)
name = each.value
namespace_id = azurerm_servicebus_namespace.default.id
enable_partitioning = var.enable_partitioning
}
resource "azurerm_servicebus_topic" "default" {
for_each = toset(var.topics)
name = each.value
namespace_id = azurerm_servicebus_namespace.default.id
enable_partitioning = var.enable_partitioning
}
resource "azurerm_servicebus_subscription" "default" {
for_each = toset(var.servicebus_subscription)
name = each.value
topic_id = azurerm_servicebus_topic.default[each.key]
max_delivery_count = var.max_delivery_count
}
variable.tf
topics = ["test001"]
queues = ["test00_queue"]
ip_rules = []
virtual_network_subnet_ids = []
servicebus_subscription=["tf-sub"]
FYI: I'm able to create topic but error thronging from subscription creation time

Answer 1

How to access parent resource block value in the child resource block:
"ID" (topic_id) should be passed forazurerm_servicebus_topic.default[each.key] as azurerm_servicebus_topic.default[each.key].id because each.key doesn't not accept topic_id value which is the ID of the service bus topic to create it in a given subscription.
I made below changes to your code and was able to successfully create a service bus namespace in the given subscription.
resource "azurerm_servicebus_subscription" "default" {
for_each = toset(["topic1","topic2"])
name = each.value
topic_id = azurerm_servicebus_topic.default[each.key].id
max_delivery_count = 1
}
terraform init:
terraform plan:
terraform apply:
Deployed in portal without creation time errors:
Service Bus namespace -> Queues:
Service Bus namespace -> Topics: