Failed to extract specific value from map object terraform - terraform

Question

This is my main file
services_list = flatten([
reverse(values(var.host_svc)) ])
}
variable "host_svc" {
type = map(map(any))
}
output "aa" {
value = local.services_list
}
This is terraform tfvars file
host_svc = {
accounts = {
name = "accounts"
pod = "3"
cpu = "512M"
memory = "1024M"
}
analytics = {
name = "analytics"
pod = "3"
cpu = "512M"
memory = "1024M"
}
}
When i am output local.services_list i ma getting whole object. i just want to fetch just name of each map object like accounts,analytics.
i have tried with list data type it works but i want to do with map ojject because i have to use different object values

Answer 1

You can do that much easier than you are trying:
local {
services_list = [for k, v in var.host_svc : k]
}
Or even more easy using the built-in keys function [1]:
local {
services_list = keys(var.host_svc)
}
[1] https://developer.hashicorp.com/terraform/language/functions/keys

Answer 2

If I understood you correctly, you want to read the names from your map. If you want to read your map keys, just use keys(map) function:
variable "host_svc" {
type = map(map(any))
default = {
accounts_k = {
name = "accounts"
pod = "3"
cpu = "512M"
memory = "1024M"
}
analytics_k = {
name = "analytics"
pod = "3"
cpu = "512M"
memory = "1024M"
}
}
}
output "aa" {
value = keys(var.host_svc)
}
Which will output:
+ aa = [
+ "accounts_k",
+ "analytics_k",
]
I used _k suffix just to differentiate between the map keys and your name key inside the internal map
In case you want to read name attribute of that map you can do:
output "aa" {
value = [for svc in local.services_list : svc.name]
}
In case you don't want to have duplicates in that outputted list, use toset():
output "aa" {
value = toset([for svc in local.services_list : svc.name])
}