Variable of variable in Ansible Playbook

Question

I am trying to access variables which is defined in group_vars

group_vars/all

parent1:
  child1: somevalue1
  child2: somevalue2

parent2:
  child1: somevalue1
  child2: somevalue2

Now I am passing parent detail from ansible playbook extra vars like this

ansible-playbook playbook.yml -e "parent=parent1"

Now How can I access parent1.child1 value where parent1 comes in {{ parent }} vars?

My playbook look like this:-

playbook.yml

- hosts: local
  user: roop
  gather_facts: no
  connection: local

  vars: 
     parent: ""

  tasks: 

  #get parent value
  - debug: msg={{ parent }}

  #trying to access parent1.child1 value here
  - debug: msg={{ {{ parent }}.child1 }}

Playbook output:-

PLAY [local] ******************************************************************

TASK: [debug msg=local] *******************************************************
ok: [127.0.0.1] => {
    "msg": "parent1"
}

TASK: [debug msg={{{{parent}}.child1}}] ***************************************
ok: [127.0.0.1] => {
    "msg": "{{{{parent}}.child1}}"
}

PLAY RECAP ********************************************************************
127.0.0.1                  : ok=2    changed=0    unreachable=0    failed=0

Can anyone guide how can I achieve this or any alternate solution.

Answer 1

How I have done this

Change group_vars/all like below:-

data:
    parent1:
      child1: somevalue1
      child2: somevalue2

    parent2:
      child1: somevalue1
      child2: somevalue2

Change in playbook.yml:-

 - debug: msg={{ data[parent].child1 }}

Please share if you have any better solution :)