How can I use Ansible nested variable? -

i have ansible playbook 1 below, want use nested variable this: msg={{{{component}}.community_release_num}}, when run playbook:

ansible-playbook vartest.yml -e 'version=version_402', not work   [es@vpn-server nested-var]$ tree . ├── vars │   ├── horizon.yml │   └── version_402.yml └── vartest.yml  1 directory, 3 files [es@vpn-server nested-var]$ cat vartest.yml  ---  - name: test    hosts: localhost   vars_files:     - vars/{{version}}.yml   tasks:     - debug: msg={{{{component}}.community_release_num}}     - debug: msg={{{{component}}.release_num}}  [es@vpn-server nested-var]$ cat vars/horizon.yml  component: horizon  [es@vpn-server nested-var]$ cat vars/version_402.yml  - horizon:    community_release_num: '9.0.1'    release_num: '4.0.2' [es@vpn-server nested-var]$ 

error messages

[es@vpn-server nested-var]$ ansible-playbook vartest.yml -e 'version=version_402' /usr/lib64/python2.6/site-packages/cryptography/__init__.py:25: deprecationwarning: python 2.6 no longer supported python core team, please upgrade python.   deprecationwarning  play [test] ******************************************************************************************************* /usr/lib64/python2.6/site-packages/crypto/util/number.py:57: powminsecurewarning: not using mpz_powm_sec.  should rebuild using libgmp >= 5 avoid timing attack vulnerability.   _warn("not using mpz_powm_sec.  should rebuild using libgmp >= 5 avoid timing attack vulnerability.", powminsecurewarning)  task [debug] ****************************************************************************************************** fatal: [localhost]: failed! => {"failed": true, "msg": "template error while templating string: expected token 'colon', got '}'. string: {{{{component}}.community_release_num}}"}     retry, use: --limit @/data/wangqian/artemis-code-test/artemis/ansible/update/nested-var/vartest.retry  play recap ******************************************************************************************************** localhost                  : ok=0    changed=0    unreachable=0    failed=1   

can ansible use nested variable, if yes, how use it?

per ansible faq:

another rule ‘moustaches don’t stack’. see this:

{{ somevar_{{other_var}} }}  

the above not work, if need use dynamic variable use hostvars or vars dictionary appropriate:

{{ hostvars[inventory_hostname]['somevar_' + other_var] }} 

so in case:

- debug: msg={{hostvars[inventory_hostname][component].community_release_num}} 

or

- debug: msg={{vars[component].community_release_num}}