Problems in creating aws route table using terraform

Question

Running terraform v1.0.9 with AWS plugin v3.63.0 on a mac

Following hashicorp instructions for creating a route table (https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route_table), but getting the following error:

Error: Incorrect attribute value type
...
Inappropriate value for attribute "route": element 0: attributes "carrier_gateway_id", "destination_prefix_list_id", "egress_only_gateway_id",
│ "instance_id", "ipv6_cidr_block", "local_gateway_id", "nat_gateway_id", "network_interface_id", "transit_gateway_id", "vpc_endpoint_id", and
│ "vpc_peering_connection_id" are required.

Here is my main.tf:

provider "aws" {
  region = "us-east-1"
}

resource "aws_vpc" "my-test-vpc" {
  cidr_block = "10.0.0.0/16"
  tags = {
    Name = "my-test-vpc"
  }
}

resource "aws_internet_gateway" "gw" {
  vpc_id = aws_vpc.my-test-vpc.id
}

resource "aws_route_table" "prod-route-table" {
  vpc_id = aws_vpc.my-test-vpc.id

  route = [
    {
      cidr_block = "0.0.0.0/0"
      gateway_id = aws_internet_gateway.gw.id
    }
  ]

  tags = {
    Name = "production"
  }
}

Answer 1

I have run into something similar, without getting to the bottom of the root cause, so this is not the best possible answer, but moving the route out into its own explicit resource works for me:

resource "aws_route_table" "prod-route-table" {
  vpc_id = aws_vpc.my-test-vpc.id

  tags = {
    Name = "production"
  }
}

resource "aws_route" "prod-route-igw" {
  route_table_id            = aws_route_table.prod-route-table.id
  destination_cidr_block    = "0.0.0.0/0"
  gateway_id                = aws_internet_gateway.gw.id
  depends_on                = [aws_route_table.prod-route-table]
}