Dynamic data source in Terraform 12 - azure

Question

I'm creating alerts (azurerm_monitor_scheduled_query_rules_alert) in Azure using Terraform. You can include a list of action groups (i.e. the groups that you send the alerts to).
Within the TFVars file I will pass in a variable value of a list of the names of the action groups. However, the alert module needs the ID's of the resources, not the names. So I have a data source that would get the info of an action group. The Alert resource can then refer to the data source to acquire the azure resource id.
This works fine if I have just one action group, but the size of the list with action group names can vary. I'm trying to figure out how I can convert all action group names to id for ingestion by the resource.
resource "azurerm_monitor_scheduled_query_rules_alert" "tfTestAlertExample" {
for_each = {for alert in var.scheduled_query_alerts : alert.name => alert}
name = each.value["name"]
location = data.azurerm_resource_group.resource_group.location
resource_group_name = data.azurerm_resource_group.resource_group.name
action {
# --This part here. How do I get make this dynamic?--
action_group = [
data.azurerm_monitor_action_group.action_group.id
]
email_subject = each.value["email_subject"]
custom_webhook_payload = "{}"
}
data_source_id = ................ etc
So in the above example, there will only be one action{} block, but the Action_group list within that needs to be dynamic, with ID's retrieved from a data source. Or maybe there's another way of doing this that I've not considered.
Any help would be greatly appreciated.

Answer 1

If you just want to convert the list of action group names to its Ids, you can do it like this:
# declare the variables
variable "action_group_names" {
default = ["nancyAG1","nancyAG2"]
}
# retrieve the Id of action group
data "azurerm_monitor_action_group" "example" {
count = length(var.action_group_names)
resource_group_name = "existingRG"
name = element(var.action_group_names,count.index)
}
# output the result to the terminal
output "groups_id" {
value = data.azurerm_monitor_action_group.example[*].id
}
Then pass Ids to the resource like this:
resource "azurerm_monitor_scheduled_query_rules_alert" "example" {
name = format("%s-queryrule", var.prefix)
location = azurerm_resource_group.example.location
resource_group_name = azurerm_resource_group.example.name
action {
action_group = data.azurerm_monitor_action_group.example[*].id
email_subject = "Email Header"
custom_webhook_payload = "{}"
}
Check the action_group Ids.