How to filter data from locals based on condition terraform?

Question

Main.tf

locals {
    location_mapping = [
    {
        "location": "L1"
        "resource_group_name": "R1"
        "name_log_workspace_name": "W1"
    },
    {
        "location": "L2"
        "resource_group_name": "R2"
        "name_log_workspace_name": "W2"
    },
    {
        "location": "L3"
        "resource_group_name": "R3"
        "name_log_workspace_name": "W3"
    }
    ]
}

data "azurerm_log_analytics_workspace" "example" {
    # Populate name and resource group based on var.location(L2) condition if location matches in locals
    name                = "W2"
    resource_group_name = "R2"
}

I want to populate name and resource_group_name dynamically based on the location condition in data block from locals.

Example

if I pass location value L2 then name=W2 and resource_group_name=R2

Answer 1

As suggested in the comments, you can re-organize your local.location_mapping into mapping, e.g., called local.helper_map:

locals {
      helper_map = {for val in local.location_mapping:
                    val["location"]=>val}
}

Then in your azurerm_log_analytics_workspace you can use it as follows:

data "azurerm_log_analytics_workspace" "example" {
    # Populate name and resource group based on var.location(L2) condition if location matches in locals
    name                = local.helper_map["L2"]["name_log_workspace_name"]
    resource_group_name = local.helper_map["L2"]["resource_group_name"]
}