Terraform: Object List Value Has No Attributes - terraform

Question

Getting an error on Terraform Plan saying my object has no attributes for the name value. We are deploying about 7 private dns zones and many of them live in the same resource group. some may live in others, but most live in the same one.
Error: Unsupported attribute
on Modules/privatednszone/main.tf line 4, in data "azurerm_resource_group" "this":
name = each.value.name
This value does not have any attributes.
MAIN
terraform {
required_providers {
azurerm = {
source = "hashicorp/azurerm"
version = "2.83.0"
}
}
}
provider "azurerm" {
features {}
}
variable "private_dns_zones" {
type = map(object({
dns_zone_name = string
resource_group_name = string
tags = map(string)
vnet_links = list(object({
zone_to_vnet_link_name = string
vnet_name = string
networking_resource_group = string
zone_to_vnet_link_exists = bool
vnet_link_rg_name = string
}))
zone_exists = bool
registration_enabled = bool
}))
description = "Map containing Private DNS Zone Objects"
default = {}
}
data "azurerm_resource_group" "this" {
# read from local variable, index is resource_group_name
for_each = local.rgs_map
name = each.value.name
}
locals {
rgs_map = {
for n in var.private_dns_zones :
n.resource_group_name => {
name = n.resource_group_name
}
}
}
output "rgs_map" {
value = local.rgs_map
}
output "rg_data" {
value = data.azurerm_resource_group.this
}
TFVARS
Code below is a sample of two dns zones, but there are additional ones.
private_dns_zones = {
zone1 = {
dns_zone_name = "privatelink.vaultcore.azure.net"
resource_group_name = "Terraform1"
tags = {
iac = "Terraform"
syntax = "zone1"
}
zone_exists = false
vnet_links = [
{
zone_to_vnet_link_name = "vaultcore-vnet-eastus2-01"
vnet_name = "vnet-eastus2-01"
networking_resource_group = "Terraform1"
zone_to_vnet_link_exists = false
vnet_link_rg_name = "Terraform1"
}
]
registration_enabled = false
},
zone2 = {
dns_zone_name = "privatelink.monitor.azure.com"
resource_group_name = "Terraform1"
tags = {
iac = "Terraform"
syntax = "zone2"
}
zone_exists = false
vnet_links = [
{
zone_to_vnet_link_name = "monitor-vnet-eastus2-01"
vnet_name = "vnet-eastus2-01"
networking_resource_group = "Terraform1"
zone_to_vnet_link_exists = false
vnet_link_rg_name = "Terraform1"
}
]
registration_enabled = false
}
}

Answer 1

You code seems to work fine only if I use different resource group names. As you are using duplicate values of resource group names which is your requirement creating a map "rgs_map" with your code is not possible as it will error out with below :
So , in order to resolve the above error , I used something like below :
locals {
rgs_map = {
for i,n in var.private_dns_zones : "${i}" =>{
name = n.resource_group_name
}
}
}
Complete code:
terraform {
required_providers {
azurerm = {
source = "hashicorp/azurerm"
version = "2.83.0"
}
}
}
provider "azurerm" {
features {}
}
variable "private_dns_zones" {
type = map(object({
dns_zone_name = string
resource_group_name = string
tags = map(string)
vnet_links = list(object({
zone_to_vnet_link_name = string
vnet_name = string
networking_resource_group = string
zone_to_vnet_link_exists = bool
vnet_link_rg_name = string
}))
zone_exists = bool
registration_enabled = bool
}))
description = "Map containing Private DNS Zone Objects"
default = {}
}
data "azurerm_resource_group" "this" {
# read from local variable, index is resource_group_name
for_each = local.rgs_map
name = each.value.name
}
locals {
rgs_map = {
for i,n in var.private_dns_zones : "${i}" =>{
name = n.resource_group_name
}
}
}
output "rgs_map" {
value = local.rgs_map
}
output "rg_data" {
value = data.azurerm_resource_group.this
}
Output: