`enabled` parameter to avoid logical statements in `count`

Terraform v0.12.2 ### Use-cases We often use `count` to disable a resource (above all in modules) from a boolean var, with statements like `count = var.enabled ? 1 : 0` or `count = var.enabled ? 1 : length([some list of resources or datasources])` Here are among others some code snippets from `terraform-aws-vpc` module : ``` resource "aws_subnet" "private" { count = var.create_vpc && length(var.private_subnets) > 0 ? length(var.private_subnets) : 0 vpc_id = local.vpc_id cidr_block = var.private_subnets[count.index] availability_zone = element(var.azs, count.index) tags = merge( { "Name" = format( "%s-${var.private_subnet_suffix}-%s", var.name, element(var.azs, count.index), ) }, var.tags, var.private_subnet_tags, ) } resource "aws_network_acl" "public" { count = var.create_vpc && var.public_dedicated_network_acl && length(var.public_subnets) > 0 ? 1 : 0 vpc_id = element(concat(aws_vpc.this.*.id, [""]), 0) subnet_ids = aws_subnet.public.*.id tags = merge( { "Name" = format("%s-${var.public_subnet_suffix}", var.name) }, var.tags, var.public_acl_tags, ) } resource "aws_network_acl_rule" "public_inbound" { count = var.create_vpc && var.public_dedicated_network_acl && length(var.public_subnets) > 0 ? length(var.public_inbound_acl_rules) : 0 network_acl_id = aws_network_acl.public[0].id egress = false rule_number = var.public_inbound_acl_r

Posted by romachalm on Jul 2, 2019, 8:16 AM

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