Terraform Cosmosdb multiple subnet - azure-devops

Question

Terraform Cosmosdb multiple subnet
Getting error when add additional subnet for cosmosdb
Terraform Error:
Error: Invalid value for module argument
on manifests/backend.tf line 289, in module "cosmosdb_1":
289: vnet_subnet_id = ["azurerm_subnet.backend.id", "azurerm_subnet.application.id", "azurerm_subnet.frontend.id"]
The given value is not suitable for child module variable "vnet_subnet_id"
defined at modules/cosmosdb/variable.tf:26,1-26: element 0: object required.
Configuration for main.tf defined variable for subnets
dynamic "virtual_network_rule" {
for_each = var.virtual_network_rule != null ? toset(var.virtual_network_rule) : []
content {
id = [var.vnet_subnet_id]
ignore_missing_vnet_service_endpoint = virtual_network_rule.value.ignore_missing_vnet_service_endpoint
}
}
variable.tf file define variable type
variable "vnet_subnet_id" {
type = list(object({
id = string,
ignore_missing_vnet_service_endpoint = bool
}))
}
main configuration for vnet subnet defined in backend.tf
module "cosmosdb_1" {
depends_on = [module.vnet]
source = "./../modules/cosmosdb"
cosmodb_account_name = "${var.env}${var.cosmodb_account_name_1}"
resource_group_name = "${var.env}-bsai"
ip_range_filter = var.ip_range_filter
location = "${var.region}"
cosmosdb_name = var.cosmosdb_name_1
enable_automatic_failover = var.enable_automatic_failover
failover_location_secondary = var.failover_location_secondary
failover_priority_secondary = var.failover_priority_secondary
vnet_subnet_id = ["azurerm_subnet.backend.id", "azurerm_subnet.application.id", "azurerm_subnet.frontend.id"]
}

Answer 1

Solution:
Module: main.tf
dynamic "virtual_network_rule" {
for_each = var.vnet_subnet_id
content {
id = virtual_network_rule.value.id
ignore_missing_vnet_service_endpoint = true
}
}
variable.tf
variable "vnet_subnet_id" {
description = "List of subnets to be used in Cosmosdb."
type = list(object({
id = string
}))
}
Backend.tf
vnet_subnet_id = [{id = azurerm_subnet.backend.id}, {id = azurerm_subnet.application.id}, {id = azurerm_subnet.frontend.id}]