Flatten a map in terraform

locals.tf

locals {
  nested_map = {
    "app1" = {
      "port"  = 80
      "image" = "nginx:latest"
      "url" = [
        "https://www.google.com",
        "https://www.github.com",
        "https://www.hashicorp.com"
      ]
    },
    "app2" = {
      "port"  = 8080
      "image" = "tomcat:latest",
      "url" = [
        "https://www.google.com",
        "https://www.github.com",
        "https://www.hashicorp.com"
      ]
    }
  }

  flattened_map = flatten([
    for app_name, app_details in local.nested_map :
    [
      for url in app_details["url"] :
      { app_name = "${app_name}", url = "${url}", port = app_details["port"], image = app_details["image"] }
    ]
  ])
}


/*

$ terraform console <<<local.flattened_map
[
  {
    "app_name" = "app1"
    "image" = "nginx:latest"
    "port" = 80
    "url" = "https://www.google.com"
  },
  {
    "app_name" = "app1"
    "image" = "nginx:latest"
    "port" = 80
    "url" = "https://www.github.com"
  },
  {
    "app_name" = "app1"
    "image" = "nginx:latest"
    "port" = 80
    "url" = "https://www.hashicorp.com"
  },
  {
    "app_name" = "app2"
    "image" = "tomcat:latest"
    "port" = 8080
    "url" = "https://www.google.com"
  },
  {
    "app_name" = "app2"
    "image" = "tomcat:latest"
    "port" = 8080
    "url" = "https://www.github.com"
  },
  {
    "app_name" = "app2"
    "image" = "tomcat:latest"
    "port" = 8080
    "url" = "https://www.hashicorp.com"
  },
]

*/