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I am getting the below error while using flatten function
Error: Invalid index
│
│ on helpers.tf line 11, in locals:
│ 11: ]) : "${x.app_region}_${x.app_environment}" => x }["${var.APP_REGION}_${var.APP_ENVIRONMENT}"]
│ ├────────────────
│ │ local.regions_defaults is object with 2 attributes
│ │ local.regions_manifest is object with 2 attributes
│ │ var.APP_ENVIRONMENT is "dv"
│ │ var.APP_REGION is "eastus"
My Code :
region_manifest.tf
locals {
regions_defaults = {
env_short_name = "uat"
instance_number = "001"
}
}
locals {
regions_manifest = {
euz = {
azure_region = "eastus"
environments = {
dv = {
env_short_name = "dev"
instance_number = "001"
}
tst = {
env_short_name = "tst"
instance_number = "002"
}
}
}
wuz = {
azure_region = "westus"
environments = {
dv = {
env_short_name = "dev"
instance_number = "001"
}
tst = {
env_short_name = "tst"
instance_number = "002"
}
}
}
}
}
helpers.tf file
locals {
region = { for x in flatten([
for region_key, region in local.regions_manifest : [
for environment_key, environment in region.environments : merge(local.regions_defaults, region, environment, {
app_region = region_key
app_environment = environment_key
environments = null
regions = null
})
]
]) : "${x.app_region}_${x.app_environment}" => x }["${var.APP_REGION}_${var.APP_ENVIRONMENT}"]
}
providers.tf
terraform {
required_version = "~> 1.0"
required_providers {
azuread = "~> 3.0"
azurerm = "~> 4.0"
}
}
provider "azurerm" {
tenant_id = var.tenant_id
client_id = var.client_id
client_secret = var.client_secret
subscription_id = var.subscription_id
features {}
}
variables.tf
variable "APP_ENVIRONMENT" {
description = "Environment: dev, qa,test, prod,hub,spoke,stage"
default = "dv" #remove these when configured at Space-lift
validation {
condition = contains(["dv","tst","qa","uat","prod","dr"],var.APP_ENVIRONMENT)
error_message = "Valid values for ENVIRONMENT are dv,tst,qa,uat,prod,dr"
}
}
variable "APP_REGION" {
description = "Azure Location (see: )"
default = "eastus" #remove these when configured at Space-lift
}
variable "client_id" {
default = "12344"
}
variable "client_secret" {
default = "abcde"
}
variable "tenant_id" {
default = "2341-4569-09439-0987"
}
variable "subscription_id" {
default = "456hfy8792"
}
application.tf
module "resource_group" {
source = "./modules/resource_group"
for_each = toset(module.naming.rg_name_patterns)
rg_name = each.value
location = local.region.azure_region
tags = local.tags
}
module
Service Abbreviation
variable "abbreviation" {
default = "rg"
}
variable "location" {
default = ""
}
variable "rg_name" {}
Optional
variable "tags" {}
resource "azurerm_resource_group" "resource_group" {
name = var.rg_name
location = var.location
tags = var.tags
lifecycle {
ignore_changes = [
tags["CreatedOnDate"]
]
}
}
I am getting the below error while using flatten function
Error: Invalid index
│
│ on helpers.tf line 11, in locals:
│ 11: ]) : "${x.app_region}_${x.app_environment}" => x }["${var.APP_REGION}_${var.APP_ENVIRONMENT}"]
│ ├────────────────
│ │ local.regions_defaults is object with 2 attributes
│ │ local.regions_manifest is object with 2 attributes
│ │ var.APP_ENVIRONMENT is "dv"
│ │ var.APP_REGION is "eastus"
My Code :
region_manifest.tf
locals {
regions_defaults = {
env_short_name = "uat"
instance_number = "001"
}
}
locals {
regions_manifest = {
euz = {
azure_region = "eastus"
environments = {
dv = {
env_short_name = "dev"
instance_number = "001"
}
tst = {
env_short_name = "tst"
instance_number = "002"
}
}
}
wuz = {
azure_region = "westus"
environments = {
dv = {
env_short_name = "dev"
instance_number = "001"
}
tst = {
env_short_name = "tst"
instance_number = "002"
}
}
}
}
}
helpers.tf file
locals {
region = { for x in flatten([
for region_key, region in local.regions_manifest : [
for environment_key, environment in region.environments : merge(local.regions_defaults, region, environment, {
app_region = region_key
app_environment = environment_key
environments = null
regions = null
})
]
]) : "${x.app_region}_${x.app_environment}" => x }["${var.APP_REGION}_${var.APP_ENVIRONMENT}"]
}
providers.tf
terraform {
required_version = "~> 1.0"
required_providers {
azuread = "~> 3.0"
azurerm = "~> 4.0"
}
}
provider "azurerm" {
tenant_id = var.tenant_id
client_id = var.client_id
client_secret = var.client_secret
subscription_id = var.subscription_id
features {}
}
variables.tf
variable "APP_ENVIRONMENT" {
description = "Environment: dev, qa,test, prod,hub,spoke,stage"
default = "dv" #remove these when configured at Space-lift
validation {
condition = contains(["dv","tst","qa","uat","prod","dr"],var.APP_ENVIRONMENT)
error_message = "Valid values for ENVIRONMENT are dv,tst,qa,uat,prod,dr"
}
}
variable "APP_REGION" {
description = "Azure Location (see: https://azure.microsoft.com/en-us/explore/global-infrastructure/geographies/#overview)"
default = "eastus" #remove these when configured at Space-lift
}
variable "client_id" {
default = "12344"
}
variable "client_secret" {
default = "abcde"
}
variable "tenant_id" {
default = "2341-4569-09439-0987"
}
variable "subscription_id" {
default = "456hfy8792"
}
application.tf
module "resource_group" {
source = "./modules/resource_group"
for_each = toset(module.naming.rg_name_patterns)
rg_name = each.value
location = local.region.azure_region
tags = local.tags
}
module
Service Abbreviation
variable "abbreviation" {
default = "rg"
}
variable "location" {
default = ""
}
variable "rg_name" {}
Optional
variable "tags" {}
resource "azurerm_resource_group" "resource_group" {
name = var.rg_name
location = var.location
tags = var.tags
lifecycle {
ignore_changes = [
tags["CreatedOnDate"]
]
}
}
- Have you tried printing the output when using the flatten function? @Pallab – Jahnavi Commented Nov 22, 2024 at 3:56
1 Answer
Reset to default 0In your scenario, you can use lookup() function available in terraform to retrieve a specific value from a Terraform map based on a specific given key.
Syntax: lookup(map, key, default_value)
lookupretrieves the value of a single element from a map, given its key. If the given key does not exist, the given default value is returned instead.
Below is the helpers.tf code after few modifications:
locals {
region = { for x in flatten([
for region_key, region in local.regions_manifest : [
for environment_key, environment in region.environments : merge(local.regions_defaults, region, environment, {
app_region = region_key
app_environment = environment_key
environments = null
regions = null
})
]
]) : "${x.app_region}_${x.app_environment}" => x
}
picked_region = lookup(local.region, "${var.APP_REGION}_${var.APP_ENVIRONMENT}", null)
}
Output:
You can also refer here for more Terraform usecases using lookup() function.
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