terraform nested for each loop in azure storage account - azure

Question

I would want to create multiple storage acounts and inside each of those sotrage accounts some containers.
If I would want 3 storage account i would always want to create container-a and container-b in those 3 storage accounts
So for example would be. Storage account list ["sa1","sa2","sa3"].
resource "azurerm_storage_account" "storage_account" {
count = length(var.list)
name = var.name
resource_group_name = module.storage-account-resource-group.resource_group_name[0]
location = var.location
account_tier = var.account_tier
account_kind = var.account_kind
then container block
resource "azurerm_storage_container" "container" {
depends_on = [azurerm_storage_account.storage_account]
count = length(var.containers)
name = var.containers[count.index].name
container_access_type = var.containers[count.index].access_type
storage_account_name = azurerm_storage_account.storage_account[0].name
container variables:
variable "containers" {
type = list(object({
name = string
access_type = string
}))
default = []
description = "List of storage account containers."
}
list variable
variable "list" {
type = list(string)
description = "the env to deploy. ['dev','qa','prod']"
This code will create only one container in the first storage account "sa1" but not in the others two "sa2" and "sa3". I read I need to use 2 for each to iterate in both list of storage account and continaers, but not sure how should be the code for it.

Answer 1

It would be better to use for_each:
resource "azurerm_storage_account" "storage_account" {
for_each = toset(var.list)
name = var.name
resource_group_name = module.storage-account-resource-group.resource_group_name[0]
location = var.location
account_tier = var.account_tier
account_kind = var.account_kind
}
then you need an equivalent of a double for loop, which you can get using setproduct:
locals {
flat_list = setproduct(var.list, var.containers)
}
and then you use local.flat_list for containers:
resource "azurerm_storage_container" "container" {
for_each = {for idx, val in local.flat_list: idx => val}
name = each.value.name[1].name
container_access_type = each.value.name[1].access_type
storage_account_name = azurerm_storage_account.storage_account[each.value[0]].name
}
p.s. I haven't run the code, thus it may require some adjustments, but the idea remains valid.