Unique values from ansible output dict's - ansible

Question

I have some servers with a lot of wordpress instances, who I ask them what versions they have.
- name: CONTADOR WP VERSIONES
shell: mycommand
register: wp_versions
- debug: msg: "{{ wp_versions.stdout_lines }}"
For example:
TASK [debug] *********************************************************************
ok: [server1] => {
"msg": [
"5.1.13"
]
}
ok: [server2] => {
"msg": [
"5.1.12",
"5.1.13"
]
}
ok: [server3] => {
"msg": [
"5.1.10",
"5.1.13",
]
}
I need to list a unique values like this:
"msg": [
"5.1.10",
"5.1.12",
"5.1.13",
]
I have tried all that i found but nothing works as I want.
Thanks

Answer 1

Use special variable ansible_play_hosts and extract the variables from the hostvars
- set_fact:
all_vers: "{{ ansible_play_hosts|
map('extract', hostvars, ['wp_versions', 'stdout_lines'])|
flatten|unique }}"
run_once: true
gives
all_vers:
- 5.1.13
- 5.1.12
- 5.1.10

Answer 2

You could do something like this:
- hosts: all
gather_facts: false
tasks:
- name: CONTADOR WP VERSIONES
shell: mycommand
register: wp_versions
- hosts: localhost
gather_facts: false
tasks:
# This tasks builds a flattened list of all the
# wp_versions.stdout_lines values collected from your hosts.
- name: Collect wp_versions information
set_fact:
all_wp_versions_pre: "{{ all_wp_versions_pre + hostvars[item].wp_versions.stdout_lines }}"
loop: "{{ groups.all }}"
vars:
all_wp_versions_pre: []
# Here we use the `unique` filter to produce a list of
# unique versions.
- name: Set all_wp_versions fact
set_fact:
all_wp_versions: "{{ all_wp_versions_pre|unique }}"
- debug:
var: all_wp_versions
Given you examples, this would produce the following output:
TASK [debug] ********************************************************************************************
ok: [localhost] => {
"all_wp_versions": [
"5.1.13",
"5.1.12",
"5.1.10"
]
}