Terraform: How to pass map to module

module.tf

variable "region" {
    default = "tr2"
    description = "The region of openstack, for image/flavor/network lookups."
}

variable "image" {
    default = {
         tr2 = "eee08821-c95a-448f-9292-73908c794661"
         tr2-1 = ""
         RegionOne = "WRONG VALUE"
    }
}

output "image_id" {
  value = "${lookup(var.image, var.region)}"
}

test.tf

module "test" {
    source = "./module"

    region = "${var.region}"
    image = "${var.image}"
}

variable "region" {
    default = "RegionOne"
    description = "The region of openstack, for image/flavor/network lookups."
}

variable "image" {
    default = {
         RegionOne = "CORRECT VALUE"
         RegionOne-1 = ""
    }
}

resource "template_file" "example" {
  template = "${region}: ${image_id} ${image}"
  vars {
    region = "${var.region}"
    image_id = "${module.test.image_id}"
    image = "${var.image}"
  }
}

output "rendered" {
  value = "${template_file.example.rendered}"
}

Is this not more "how to pass a variable" rather than a "map"? Please do help me understand my confusion.

Hi @k7faq, when I made this in 2016 it seemed it was not possible to send your own MAP to override a MAP used in a module, only string interpolation was possible.

This was trying to send

{
         RegionOne = "CORRECT VALUE"
         RegionOne-1 = ""
    }

This may have changed by now in Terraform 0.12 :)