subnet ID from an inline virtual network resource - azure

Question

I am creating a virtual network using Terraform and the subnets are created within the virtual network resource block (instead of using its own resource block).
I am trying to associate some route tables to the subnets, however I'm not sure how to obtain the subnet resource ID when the subnets are created within virtual network, could someone help?
main.tf
terraform {
required_providers {
azurerm = {
source = "hashicorp/azurerm"
version = "3.24.0"
}
}
}
provider "azurerm" {
skip_provider_registration = true
features {}
}
###########################
# RESOURCE GROUP CREATION #
###########################
resource "azurerm_resource_group" "rg" {
name = var.rg.name
location = var.rg.location
}
############################
# VIRTUAL NETWORK CREATION #
############################
resource "azurerm_virtual_network" "vnet" {
name = var.vnet.name
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
address_space = var.vnet.address_space
dns_servers = var.vnet.dns_servers
subnet {
name = var.vnet.subnet1_name
address_prefix = var.vnet.subnet1_address_prefix
}
subnet {
name = var.vnet.subnet2_name
address_prefix = var.vnet.subnet2_address_prefix
}
subnet {
name = var.vnet.subnet3_name
address_prefix = var.vnet.subnet3_address_prefix
}
subnet {
name = var.vnet.subnet4_name
address_prefix = var.vnet.subnet4_address_prefix
}
subnet {
name = var.vnet.subnet5_name
address_prefix = var.vnet.subnet5_address_prefix
}
}
########################
# ROUTE TABLE CREATION #
########################
resource "azurerm_route_table" "fslogix_rt" {
name = var.rt.fslogix.name
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
disable_bgp_route_propagation = false
}
resource "azurerm_route_table" "back_office_rt" {
name = var.rt.back_office.name
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
disable_bgp_route_propagation = false
}
resource "azurerm_route_table" "dev_dev_rt" {
name = var.rt.dev_dev.name
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
disable_bgp_route_propagation = false
}
resource "azurerm_route_table" "dev_prod_rt" {
name = var.rt.dev_prod.name
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
disable_bgp_route_propagation = false
}
resource "azurerm_route_table" "front_office_rt" {
name = var.rt.front_office.name
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
disable_bgp_route_propagation = false
}
##################
# ROUTE CREATION #
##################
resource "azurerm_route" "fslogix_routes" {
for_each = var.fslogix_routes
name = each.value.name
resource_group_name = azurerm_resource_group.rg.name
route_table_name = azurerm_route_table.fslogix_rt.name
address_prefix = each.value.address_prefix
next_hop_type = each.value.next_hop_type
next_hop_in_ip_address = each.value.next_hop_in_ip_address
}
resource "azurerm_route" "back_office_routes" {
for_each = var.back_office_routes
name = each.value.name
resource_group_name = azurerm_resource_group.rg.name
route_table_name = azurerm_route_table.back_office_rt.name
address_prefix = each.value.address_prefix
next_hop_type = each.value.next_hop_type
next_hop_in_ip_address = each.value.next_hop_in_ip_address
}
resource "azurerm_route" "dev_dev_routes" {
for_each = var.developer_dev_routes
name = each.value.name
resource_group_name = azurerm_resource_group.rg.name
route_table_name = azurerm_route_table.dev_dev_rt.name
address_prefix = each.value.address_prefix
next_hop_type = each.value.next_hop_type
next_hop_in_ip_address = each.value.next_hop_in_ip_address
}
resource "azurerm_route" "dev_prod_routes" {
for_each = var.developer_prod_routes
name = each.value.name
resource_group_name = azurerm_resource_group.rg.name
route_table_name = azurerm_route_table.dev_prod_rt.name
address_prefix = each.value.address_prefix
next_hop_type = each.value.next_hop_type
next_hop_in_ip_address = each.value.next_hop_in_ip_address
}
resource "azurerm_route" "front_office_routes" {
for_each = var.front_office_routes
name = each.value.name
resource_group_name = azurerm_resource_group.rg.name
route_table_name = azurerm_route_table.front_office_rt.name
address_prefix = each.value.address_prefix
next_hop_type = each.value.next_hop_type
next_hop_in_ip_address = each.value.next_hop_in_ip_address
}
###########################
# ROUTE TABLE ASSOICATION #
###########################
resource "azurerm_subnet_route_table_association" "fslogix_rta" {
subnet_id = ???????????????????????????????????????
route_table_id = azurerm_route_table.fslogix_rt.id
}

Answer 1

You can get all the subnet_id with:
azurerm_virtual_network.vnet.subnet.*.id
You can get the first subnet_id with:
azurerm_virtual_network.vnet.subnet.*.id[0]
And the second subnet_id with:
azurerm_virtual_network.vnet.subnet.*.id[1]
And go on...
Hope this helps!