Terraform: lookup() may only be used with flat maps, this map contains elements of type list

[Puneeth-n]

Terraform Version: 0.9.4

module
main.tf

resource "aws_vpc_peering_connection" "peering" {
    count           = "${var.enable}"
:
:
:
}

# routing table entry for terraformed stateless environment
resource "aws_route" "peer-routing" {
    count                       = "${var.enable * length(lookup(var.vpc, "route_table_ids"))}"
    route_table_id              = "${element(lookup(var.vpc, "route_table_ids"), count.index)}"
    destination_cidr_block      = "${lookup(var.peer_vpc, "cidr")}"
    vpc_peering_connection_id   = "${aws_vpc_peering_connection.peering.id}"
}

# conditional routing table entry for stateful environment
resource "aws_route" "peer-routing-stateful" {
    #count                       = "${var.enable * length(lookup(var.peer_vpc, "route_table_ids")) * (lookup(var.peer_vpc, "owner_id") == lookup(var.vpc, "owner_id") ? 1 : 0) }"
    count                       = "${var.enable * length(lookup(var.peer_vpc, "route_table_ids")) * (lookup(var.peer_vpc, "owner_id") == lookup(var.vpc, "owner_id") ? 1 : 0) }"
    #count                       = "${length(lookup(var.peer_vpc, "route_table_ids"))}"
    route_table_id              = "${element(lookup(var.peer_vpc, "route_table_ids"), count.index)}"
    destination_cidr_block      = "${lookup(var.vpc, "cidr")}"
    vpc_peering_connection_id   = "${aws_vpc_peering_connection.peering.id}"
}

vpc_peering.tf

module "vpc_peering" "prod_peering" {
    source                  = "../terraform_modules/my-awesome-vpc-peering/"
    enable                  = 1

    environment             = "${var.ct_environment_name}"
    vpc {
        "vpc_id"            = "${module.main_vpc.vpc_id}"
        "owner_id"          = "${var.ct_account_id}"
        "cidr"              = "${var.ct_vpc_cidr}"
        "route_table_ids"   = ["${module.main_vpc.vpc_private_routing_table_id}", "${module.main_vpc.vpc_public_routing_table_id}"]
    }
    peer_vpc {
        "vpc_id"        = "${lookup(var.ct_master_vpc, "vpc_id")}"
        "owner_id"      = "${lookup(var.ct_master_vpc, "account")}"
        "cidr"          = "${var.ct_stateful_vpc_cidr}"
        "route_table_ids"   = [""]
    }
}

terraform plan

1 error(s) occurred:

* module.vpc_peering.aws_route.peer-routing-stateful: lookup: lookup() may only be used with flat maps, this map contains elements of type list in:

${var.enable * length(lookup(var.peer_vpc, "route_table_ids")) * (lookup(var.peer_vpc, "owner_id") == lookup(var.vpc, "owner_id") ? 1 : 0) }

Is there an easy way to get around this apart from moving the list out of the map

[jamestalbot]

You can just use dictionary syntax without using lookup at all...

${var.enable * length(var.peer_vpc["route_table_ids"]) * (lookup(var.peer_vpc, "owner_id") == lookup(var.vpc, "owner_id") ? 1 : 0) }

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