Invalid for_each argument issue with module dependencies

Terraform
1

I have a module that creates a config script based on passing a vpc_id. If I try to get that vpc_id from a vpc that I will create, I start getting errors like this:

Error: Invalid for_each argument

  on ../modules/eksctl-config/data.tf line 30, in data "aws_subnet" "private_subnets":
  30:   for_each = data.aws_subnet_ids.private_subnet_ids.ids

The "for_each" value depends on resource attributes that cannot be determined
until apply, so Terraform cannot predict how many instances will be created.
To work around this, use the -target argument to first apply only the
resources that the for_each depends on.

I’m not sure how to handle the situation. My module inputs look like this:

module "vpc" {
  source           = "../modules/eks-vpc"
  name             = var.name
  region           = var.region
  eks_cluster_name = var.eks_cluster_name
}

module "config" {
  source          = "../modules/eksctl-config"
  name            = var.eks_cluster_name
  region          = var.region
  vpc_id          = module.vpc.vpc_id
  instance_type   = "m5.2xlarge"
  public_key_name = "joaquin"
  filename        = "${path.module}/../../eksctl/cluster_config.yaml"
}
2

A post was merged into an existing topic: “Invalid for_each argument” with data source result