Add to list if not empty - terraform

Question

I have defined variable users:
users = [
{
userName = "john.doe"
roles = ["ORG_ADMIN"]
profile_attributes = null
appId = null
},
{
userName = "doe.john"
roles = ["ORG_ADMIN"]
profile_attributes = <<EOT
{
"testParameter":"value"
}
EOT
appId = "test123"
}
]
and now I want to create okta_app_user resource:
resource "okta_app_user" "app_users" {
count = length(var.users)
app_id = var.users[count.index].appId
user_id = okta_user.users[count.index].id
username = "${var.users[count.index].userName}#example.com"
profile = var.users[count.index].profile_attributes
}
but app_id can't be empty in this resource but may be empty in my configuration. Is it possible to skip that user in okta_app_user when var.users[count.index].appId is empty ?
so something similar to what can be achieved:
foreach($users in $user) {
if (!$user.app_id) {
continue;
}
}

Answer 1

Yes, you can filter out users without the appId. For example, by creating helper local variable users_with_appId:
locals {
users_with_appId = [
for user in var.users: user if user.appId != null
]
}
And then:
resource "okta_app_user" "app_users" {
count = length(local.users_with_appId)
app_id = local.users_with_appId[count.index].appId
user_id = okta_user.users[count.index].id
username = "${local.users_with_appId[count.index].userName}#example.com"
profile = local.users_with_appId[count.index].profile_attributes
}
In the above its not clear what okta_user.users[count.index].id is? Thus further adjustments may be needed.