Nested loops in Terraform - terraform

Question

I need to have nested loop logic. F.ex.
I have one local:
locals {
build_args = {
api: {
RAILS_ENV: "production"
}
client: {
NODE_ENV: "production"
}
}
}
Now I would like to connect to CircleCI with terraform and set these environments in adequate circleCI projects (api and client). The knowledge about circleci projects (name of a project) I keep here:
apps: {
api: {
desired_count: 1,
load_balancer: {
container_name: "api",
container_port: 5000,
health_check_path: "/",
listener: {
path: "api",
},
},
circleci_project: "some-api",
},
client: {
desired_count: 1,
load_balancer: {
container_name: "client",
container_port: 3000,
health_check_path: "/",
listener: {
path: "web",
},
},
circleci_project: "some-client",
}
}
Now, I need to create resource:
resource "circleci_environment_variable" "this" {
project = projects_from_apps_var
name = names_from_local_build_args
value = value_from_local_build_args
}
So as you can see I need two loops one in another to generate many name/values env pairs for many projects.

Answer 1

Just create a map keyed by project and variable name and apply a bunch of resources for each combination:
locals {
map = merge([
for project, env in local.build_args : {
for name, value in env : "${project}-${name}" => {
name = name,
value = value,
project = project
}
}
]...)
}
resource "circleci_environment_variable" "this" {
for_each = local.map
project = each.value.project
name = each.value.name
value = each.value.value
}