subelements – traverse nested key from a list of dictionaries¶
Synopsis¶
- Subelements walks a list of hashes (aka dictionaries) and then traverses a list with a given (nested sub-)key inside of those records.
Parameters¶
Examples¶
- name: show var structure as it is needed for example to make sense
hosts: all
vars:
users:
- name: alice
authorized:
- /tmp/alice/onekey.pub
- /tmp/alice/twokey.pub
mysql:
password: mysql-password
hosts:
- "%"
- "127.0.0.1"
- "::1"
- "localhost"
privs:
- "*.*:SELECT"
- "DB1.*:ALL"
groups:
- wheel
- name: bob
authorized:
- /tmp/bob/id_rsa.pub
mysql:
password: other-mysql-password
hosts:
- "db1"
privs:
- "*.*:SELECT"
- "DB2.*:ALL"
tasks:
- name: Set authorized ssh key, extracting just that data from 'users'
authorized_key:
user: "{{ item.0.name }}"
key: "{{ lookup('file', item.1) }}"
with_subelements:
- "{{ users }}"
- authorized
- name: Setup MySQL users, given the mysql hosts and privs subkey lists
mysql_user:
name: "{{ item.0.name }}"
password: "{{ item.0.mysql.password }}"
host: "{{ item.1 }}"
priv: "{{ item.0.mysql.privs | join('/') }}"
with_subelements:
- "{{ users }}"
- mysql.hosts
- name: list groups for users that have them, don't error if groups key is missing
debug: var=item
loop: "{{lookup('subelements', users, 'groups', {'skip_missing': True})}}"
Return Values¶
Common return values are documented here, the following are the fields unique to this lookup:
Key | Returned | Description |
---|---|---|
_list
-
|
list of subelements extracted
|
Status¶
- This lookup is not guaranteed to have a backwards compatible interface. [preview]
- This lookup is maintained by the Ansible Community. [community]
Authors¶
- Serge van Ginderachter <serge@vanginderachter.be>
Hint
If you notice any issues in this documentation, you can edit this document to improve it.
Hint
Configuration entries for each entry type have a low to high priority order. For example, a variable that is lower in the list will override a variable that is higher up.