Terraform Convert map output from module to list to use in other module

Question

I managed to use for_each to create resources in regions based on a given array. Now I want to use the output URNs to assign the resources to a project in Digital Ocean. The problem is that the way I output the URNs for the resources creates a map while the project_resources resource can only use lists of strings. My code:

output.tf

output "droplet_urns" {
  value = tomap({
    for k, drops in digitalocean_droplet.web : k => drops.urn
  })
}

How can I convert the map into a list or use the value based on the key? I’m using Terraform v1.1.9

Answer 1

You can use the keys function to get list with all they keys from the map. Also, you can use the values function to get a list with all the values from a map.

You would probably need something like:

resource "digitalocean_project_resources" "barfoo" {
  project = data.digitalocean_project.foo.id
  resources = values(module.my_module.droplet_urns)
}