Terraform how to fix attribute "route": set of object required

Question

I have this terraform module route_table.tf I need to use. It looks like below:

resource "aws_route_table" "aws_route_table" {

  # route {
  #   cidr_block = "0.0.0.0/0"
  #   gateway_id = var.GATEWAY_ID
  # }

  route = var.ROUTE

  tags = var.ROUTE_TABLE_TAGS

  vpc_id = var.VPC_ID
}

and I have defined the variable ROUTE as below in the inputs.tf:

variable "ROUTE" {
  type = object({ cidr_block=string, gateway_id=string })
}

And I am passing those values in the main.tf as below:

module "route_tables_public" {
  source = "./modules/route_tables"

  ROUTE =    {
    cidr_block = "0.0.0.0/0"
    gateway_id = var.GATEWAY_ID
  }

  ROUTE_TABLE_TAGS = { "Name" : "mlb-rt-public" , "Project" : "mlb"}
  VPC_ID           = module.ecs_vpc.vpc_id
}

But I am getting this error:

Inappropriate value for attribute "route": set of object required.

Can someone help me on this?

Answer 1

Your var.ROUTE is a single object, but it should be list of objects. So you can try:

variable "ROUTE" {
  type = list(object({ cidr_block=string, gateway_id=string }))
}

and then

module "route_tables_public" {
  source = "./modules/route_tables"

  ROUTE =    [{
    cidr_block = "0.0.0.0/0"
    gateway_id = var.GATEWAY_ID
  }]

  ROUTE_TABLE_TAGS = { "Name" : "mlb-rt-public" , "Project" : "mlb"}
  VPC_ID           = module.ecs_vpc.vpc_id
}

UPDATE

Your aws_route_table should be:

resource "aws_route_table" "aws_route_table" {

 dynamic "route" {
 
   for_each = var.ROUTE
   
   content {
      cidr_block = route.value.cidr_block
      gateway_id = route.value.gateway_id
    }
  }

  tags = var.ROUTE_TABLE_TAGS

  vpc_id = var.VPC_ID
}