terraform create simple loop of variable that can be used later - amazon-web-services

Question

I am new to terraform development, trying to create simple loop of variable that can be used later, some thing like below:
This perfectly worked for me and creates two subnet as expected.
variable "availability_zones" {
description = "Available Availability Zones"
type = "list"
default = [ "us-east-1a", "us-east-1b" ]
}
variable "public_subnet_cidr" {
description = "CIDR for Public Subnets"
type = "list"
default = [ "10.240.32.0/26", "10.240.32.64/26" ]
# Define Public Subnet
resource "aws_subnet" "public-subnets" {
count = 2
vpc_id = "${aws_vpc.default.id}"
cidr_block = "${element(var.public_subnet_cidr, count.index)}"
availability_zone = "${element(var.availability_zones, count.index)}"
tags {
Name = "${element(var.availability_zones, count.index)}_${element(var.public_subnet_cidr, count.index)}"
}
}
But while trying to associate those subnets to default route, I am not able to figure out how to fetch individual subnet id from those subnets created earlier. And ended up with below code. Is there a way to fetch subnet.id of individual subnets?
# Assign Default Public Route Table to Public Subnet
resource "aws_route_table_association" "default_public_route" {
subnet_id = "${aws_subnet.public-subnets.id}" <<-- This is the line I am trying to figure out
route_table_id = "${aws_route_table.default_public_route_table.id}"
}
Thanks in advance.
Sam

Answer 1

You're close on how to use it. Here's a walk through that can help you.
resource "aws_route_table_association" "default_public_route" {
count = 2
subnet_id = "${element(aws_subnet.public-subnets.*.id, count.index)}"
route_table_id = "${aws_route_table.default_public_route_table.id}"
}