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    name: subelements
    author: Serge van Ginderachter (!UNKNOWN) <[email protected]>
    version_added: "1.4"
    short_description: traverse nested key from a list of dictionaries
    description:
      - Subelements walks a list of hashes (aka dictionaries) and then traverses a list with a given (nested sub-)key inside of those records.
    options:
      _terms:
         description: tuple of list of dictionaries and dictionary key to extract
         required: True
      skip_missing:
        default: False
        description:
          - Lookup accepts this flag from a dictionary as optional. See Example section for more information.
          - If set to C(True), the lookup plugin will skip the lists items that do not contain the given subkey.
          - If set to C(False), the plugin will yield an error and complain about the missing subkey.
a 
- 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'
      ansible.posix.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
      community.mysql.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
      ansible.builtin.debug: var=item
      loop: "{{ q('ansible.builtin.subelements', users, 'groups', {'skip_missing': True}) }}"
z5
_list:
  description: list of subelements extracted
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