take [0] of values

cname/README.md

@@ -1,12 +1,13 @@
 # About
+A CNAME may contain only one entry, so if you pass multiple values (a list), it will only use the first one.
 # Usage
 
 ```hcl
 module "lakefront_cname" {
   source = "git@github.e.it.census.gov:terraform-modules/aws-dns//cname"
 
   name    = format("%v.%v", local.app_shortname, var.vpc_domain_name)
-  values = [format("%v.execute-api.%v.amazonaws.com", data.aws_api_gateway_rest_api.lakefront.id, local.region)]
+  values = format("%v.execute-api.%v.amazonaws.com", data.aws_api_gateway_rest_api.lakefront.id, local.region)
 }
 ```
 

cname/main.tf

@@ -1,17 +1,20 @@
 /* aws-dns :: cname 
 * # About
+* A CNAME may contain only one entry, so if you pass multiple values (a list), it will only use the first one.
 * # Usage
 *
 * ```hcl
 * module "lakefront_cname" {
 *   source = "git@github.e.it.census.gov:terraform-modules/aws-dns//cname"
 * 
 *   name    = format("%v.%v", local.app_shortname, var.vpc_domain_name)
-*   values = [format("%v.execute-api.%v.amazonaws.com", data.aws_api_gateway_rest_api.lakefront.id, local.region)]
+*   values = format("%v.execute-api.%v.amazonaws.com", data.aws_api_gateway_rest_api.lakefront.id, local.region)
 * }
 * ```
+*
 */
 
 locals {
   record_type = "cname"
+  values      = [local.default_values[0]]
 }

common/common.tf

@@ -17,7 +17,7 @@ locals {
   rr_type                 = upper(local.record_type)
   default_enable_ptr      = lookup(local._defaults.enable_ptr, local.record_type, false)
   default_heritage_prefix = lookup(local._defaults.heritage_prefix, local.record_type, "") != "" ? format("%v.", lookup(local._defaults.heritage_prefix, local.record_type)) : ""
-  values                  = try([tostring(var.values)], tolist(var.values))
+  default_values          = try([tostring(var.values)], tolist(var.values))
 }
 
 resource "time_static" "timestamp" {}

common/entry.tf

@@ -3,5 +3,5 @@ resource "aws_route53_record" "entry" {
   name    = var.name
   type    = local.rr_type
   ttl     = var.ttl
-  records = var.values
+  records = local.values
 }