Loop over objects within objects using terraform - terraform

Question

I have a route_table variable containing route table objects which each have several route objects.
variable "route_tables" {
description = "a map of route tables"
type = map(any)
default = {
"route_table01" = {
name = "route_table01"
route = {
name = "route1"
address_prefix = "17.65.255.0/24"
next_hop_type = "VirtualAppliance"
next_hop_in_ip_address = "10.18.128.6"
}
route = {
name = "route2"
address_prefix = "204.61.3.87/32"
next_hop_type = "VirtualAppliance"
next_hop_in_ip_address = "10.18.128.6"
}
route = {
name = "route3"
address_prefix = "13.61.37.248/29"
next_hop_type = "VirtualAppliance"
next_hop_in_ip_address = "10.18.128.6"
}
}
}
}
I'm now trying to loop over them in my module:
resource "azurerm_route_table" "route_tables" {
for_each = var.route_tables
name = each.value.name
location = azurerm_resource_group.resource_group.location
resource_group_name = azurerm_resource_group.resource_group.name
tags = local.tags
dynamic "route" {
for_each = each.value.route
content {
name = each.value.route.name
address_prefix = each.value.route.address_prefix
next_hop_type = each.value.route.next_hop_type
next_hop_in_ip_address = each.value.route.next_hop_in_ip_address
}
}
}
The tf plan completes successfully, but only 1 route is being added to the route table:
How can I loop over these routes so that all of them are added to the route table?

Answer 1

I believe one change you'll want to make is that you currently have nothing allowing you to iterate through each nested block. To use for_each, your dynamic block needs to use a different collection as the basis for how it iterates. Instead:
resource "azurerm_route_table" "route_tables" {
for_each = {
for routes in var.route_tables : routes.name => {
name = routes.name
location = routes.location
resource_group_name = routes.resource_group.name
route = routes.route
}
}
name = each.value.name
location = each.value.location
resource_group_name = each.value.resource_group_name
dynamic "route" {
for_each = each.value.route
content {
name = route.value.name
address_prefix = route.value.address_prefix
next_hop_type = route.value.next_hop_type
next_hop_in_ip_address = route.value.next_hop_in_ip_address
}
}
}
Where your variable might be
variable "route_tables" {
description = "List of route tables to create."
type = any
default = []
}
And your input might be
route_tables = [
{
name = ""
location = ""
resource_group_name = ""
num_loops = 2
route = [
{
name = ""
address_prefix = ""
next_hop_type = ""
next_hop_in_ip_address = ""
},
{
name = ""
address_prefix = ""
next_hop_type = ""
next_hop_in_ip_address = ""
}
}
]
}
Good luck and I hope this helps.
Cheers.