feat: Allow ignoring GSI changes

Author: pablotp

main.tf

@@ -21,6 +21,15 @@ locals {
   from_index = length(var.range_key) > 0 ? 0 : 1
 
   attributes_final = slice(local.attributes, local.from_index, length(local.attributes))
+
+  ignore_changes_list = var.ignore_gsi_changes ? [
+    "read_capacity",
+    "write_capacity",
+    "global_secondary_index"
+  ] : [
+    "read_capacity",
+    "write_capacity"
+  ]
 }
 
 resource "null_resource" "global_secondary_index_names" {
@@ -68,10 +77,7 @@ resource "aws_dynamodb_table" "default" {
   }
 
   lifecycle {
-    ignore_changes = [
-      read_capacity,
-      write_capacity
-    ]
+    ignore_changes = local.ignore_changes_list
   }
 
   dynamic "attribute" {

variables.tf

@@ -208,3 +208,9 @@ variable "import_table" {
   default     = null
   description = "Import Amazon S3 data into a new table."
 }
+
+variable "ignore_gsi_changes" {
+  description = "Whether to ignore changes to global_secondary_index"
+  type        = bool
+  default     = false
+}