Is it loop behaviour in general that's confusing, or the effect of
*with_subelements*? Remember that the *with_** construct is implemented
as a *lookup*. Once you understand what the *subelements* *lookup* does,
then this specific loop should make more sense.
Here's a playbook and its output log, using a your data with some
modifications to make it easier to see what's going on. I've added a
'*user4*' with no '*keys*' to show how to handle that case, too.
The first *debug* task loops they same way your playbook loops, using
*with_subelements*.
The second *debug* task doesn't loop, but invokes the *subelements*
*lookup* directly, with parameters identical to those passed to the
prior task's *with_subelements*. The *subelements* *lookup* produces a
list which, not surprisingly, matches what the prior task looped over.
[utoddl@tango ansible]$*cat test-subelements2.yml*
---
- name: Demonstrate subelements
hosts: localhost
gather_facts: false
vars:
engineers:
- username: user1
state: present
keys:
- user1keyA
- user1KeyB
- username: user2
state: present
keys:
- user2keyA
- username: user3
state: present
keys:
- user3keyA
- username: user4
state: present
note: Look! No 'keys'!
tasks:
- name:*Show subelements one per loop*
ansible.builtin.debug:
msg: "{{ item }}"
with_subelements:
- "{{ engineers }}"
- keys
- {'skip_missing': true}
- name:*Show the same subelements all in one go*
ansible.builtin.debug:
msg: "{{*lookup('subelements', engineers, 'keys', {'skip_missing': true})*
}}"
[utoddl@tango ansible]$*ansible-playbook test-subelements2.yml*
PLAY [Demonstrate subelements]
*********************************************************
TASK [*Show subelements one per loop*]
***************************************************
ok: [localhost] => (item=[{'username': 'user1', 'state': 'present'}, 'user1keyA'])
=> {
"msg": [
{
"state": "present",
"username": "user1"
},
"user1keyA"
]
}
ok: [localhost] => (item=[{'username': 'user1', 'state': 'present'}, 'user1KeyB'])
=> {
"msg": [
{
"state": "present",
"username": "user1"
},
"user1KeyB"
]
}
ok: [localhost] => (item=[{'username': 'user2', 'state': 'present'}, 'user2keyA'])
=> {
"msg": [
{
"state": "present",
"username": "user2"
},
"user2keyA"
]
}
ok: [localhost] => (item=[{'username': 'user3', 'state': 'present'}, 'user3keyA'])
=> {
"msg": [
{
"state": "present",
"username": "user3"
},
"user3keyA"
]
}
TASK [*Show the same subelements all in one go*]
*****************************************
ok: [localhost] => {
"msg": [
[
{
"state": "present",
"username": "user1"
},
"user1keyA"
],
[
{
"state": "present",
"username": "user1"
},
"user1KeyB"
],
[
{
"state": "present",
"username": "user2"
},
"user2keyA"
],
[
{
"state": "present",
"username": "user3"
},
"user3keyA"
]
]
}
PLAY RECAP
************************************************************************************************
localhost : ok=2 changed=0 unreachable=0 failed=0
skipped=0 rescued=0 ignored=0
Do let us know if something is still unclear.
--
Todd
On 7/16/23 3:30 AM, Werner van der Merwe wrote:
Hi,
This code works, I just don't understand the indexing and loop
behaviour. Hoping someone can help me understand the indexing, and why
the variables are equal to the values.
Here the code:
```
engineers:
- username: user1
state: present
keys:
- ssh-rsa AAAAB3Nza....
- ssh-rsa AAAAB3Nza....
- username: user2
state: present
keys:
- ssh-rsa AAAAB3NzaC....
- username: user3
state: present
keys:
- ssh-rsa AAAAB3NzaC1....
```
and I have a working code snippet:
```
- name: Manage authorized keys
authorized_key:
user: "{{ item.0.username }}"
state: present
key: "{{ item.1 }}"
with_subelements:
- "{{ engineers }}"
- keys
loop_control:
loop_var: item
```
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