example usage of Terraform csvdecode()

csvdecode.tf

# very slightly altered from
# https://www.terraform.io/docs/configuration/functions/csvdecode.html#use-with-the-for_each-meta-argument

locals {
  csv_data = <<-CSV
    local_id,instance_type,ami
    foo1,t2.micro,ami-54d2a63b
    foo2,t2.micro,ami-54d2a63b
  CSV

  instances = csvdecode(local.csv_data)
}

resource "null_resource" "nully" {
  for_each = { for i in local.instances : i.local_id => i }
  triggers = {
    my_id = each.value.local_id
  }
}

output "nully" {
  value = null_resource.nully
}

$ terraform apply
...
null_resource.nully["foo2"]: Creation complete after 0s [id=2423428970411014196]
null_resource.nully["foo1"]: Creation complete after 0s [id=2818486755736522600]

Apply complete! Resources: 2 added, 0 changed, 0 destroyed.

Outputs:

nully = {
  "foo1" = {
    "id" = "1232772559400057772"
    "triggers" = {
      "my_id" = "foo1"
    }
  }
  "foo2" = {
    "id" = "8322300694178091254"
    "triggers" = {
      "my_id" = "foo2"
    }
  }
}