Module-to-module dependencies

Gruntwork Customers
1

My RDS Module has dependencies to my App Module with vpc_id and subnets.
So I want my RDS module to take vpc_id and subnets from my app module.

Based on dependencies section in the docs I created to following setup:
But when I run plan-all in stage I get asked to enter vpc_id and subnets.

myProject: 
  modules:
    app:
      - main.tf
      - terragrunt.hcl # empty file
    rds:
      - main.tf
      - terragrunt.hcl 
  prod:
  stage:
    eu-west-1:
      db:
        - terragrunt.hcl

The content of myProject/modules/rds/terragrunt.hcl is

dependency "vpc" {
  config_path = "../app"
}

inputs = {
  vpc_id     = dependency.vpc.outputs.vpc_id
  subnet_ids = dependency.vpc.outputs.private_subnets
}

This is the content of my myProject/stage/eu-west-1/db/terragrunt.hcl

locals {
  environment_vars = read_terragrunt_config(find_in_parent_folders("env.hcl"))
  region_vars = read_terragrunt_config(find_in_parent_folders("region.hcl"))
  env        = local.environment_vars.locals.environment
  aws_region = local.region_vars.locals.aws_region
}

terraform {
  source = "${get_parent_terragrunt_dir()}/modules/rds/"
}
include {
  path = find_in_parent_folders()
}

inputs = {
  name = "sample-rds"
}
2

For anyone else who sees this, we resolved this in https://github.com/gruntwork-io/terragrunt-infrastructure-live-example/issues/33