Make `project_id` output non-dynamic

CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to this project will be documented in this file.
 - add support for a region region in the onprem networking example
 - **incompatible change** the `attached_disks` variable type has changed in the `compute-vm` module, to add support for regional persistend disks, and attaching existing disks to instances / templates
 - the hub and spoke via peering example now supports project creation, resource prefix, and GKE peering configuration
+- make the `project_id` output from the `project` module non-dynamic. This means you can use this output as a key for map fed into a `for_each` (for example, as a key for `iam_project_bindings` in the `iam-service-accounts` module)
 
 ## [4.3.0] - 2021-01-11
 

modules/project/outputs.tf

@@ -16,8 +16,10 @@
 
 output "project_id" {
   description = "Project id."
-  value       = try(local.project.project_id, null)
+  value       = "${local.prefix}${var.name}"
   depends_on = [
+    google_project.project,
+    data.google_project.project,
     google_project_organization_policy.boolean,
     google_project_organization_policy.list,
     google_project_service.project_services,