Ansible iteration over nested dictionary - ansible

Question

With Ansible 2.10, I am trying to iterate over a nested dictionary. The dictionary looks like that:
var1:
d1:
t1:
- p1
- p2
t2:
- p1
d2:
t1:
- p1
I would like the function return something like that:
d1, t1, p1
d1, t1, p2
d1, t2, p1
...
For any help, I will be grateful!

Answer 1

There are other (and possibly more convenient) ways to do this depending on your exact requirement. Changing your data structure might as well be an option.
Meanwhile, here is a solution to store the combinations in a list of 3 element tuples that you can reuse elsewhere.
---
- name: Product for nested dictionnary
hosts: localhost
gather_facts: false
vars:
var1:
d1:
t1:
- p1
- p2
t2:
- p1
d2:
t1:
- p1
tasks:
- name: Level 1 product (d* X t*)
set_fact:
level1: >-
{{
level1 | default([])
+
[item] | product(var1[item] | list)
}}
loop: "{{ var1 | list }}"
- name: Level 2 product (d* X t* X p*)
set_fact:
level2: >-
{{
level2 | default([])
+
[item] | product(var1[item.0][item.1]) | map('flatten')
}}
loop: "{{ level1 }}"
- name: Result
debug:
msg: "{{ item.0 }}, {{ item.1 }}, {{ item.2 }}"
loop: "{{ level2 }}"
Which gives:
PLAY [Product for nested dictionnary] **************************************************************************************************************************************************************************************************
TASK [Level 1 product (d* X t*)] *******************************************************************************************************************************************************************************************************
ok: [localhost] => (item=d1)
ok: [localhost] => (item=d2)
TASK [Level 2 product (d* X t* X p*)] **************************************************************************************************************************************************************************************************
ok: [localhost] => (item=['d1', 't1'])
ok: [localhost] => (item=['d1', 't2'])
ok: [localhost] => (item=['d2', 't1'])
TASK [Result] **************************************************************************************************************************************************************************************************************************
ok: [localhost] => (item=['d1', 't1', 'p1']) => {
"msg": "d1, t1, p1"
}
ok: [localhost] => (item=['d1', 't1', 'p2']) => {
"msg": "d1, t1, p2"
}
ok: [localhost] => (item=['d1', 't2', 'p1']) => {
"msg": "d1, t2, p1"
}
ok: [localhost] => (item=['d2', 't1', 'p1']) => {
"msg": "d2, t1, p1"
}
PLAY RECAP *****************************************************************************************************************************************************************************************************************************
localhost : ok=3 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0

Answer 2

The "Jinja-free" version below
shell> cat next_loop.yml
- set_fact:
_batch: []
- set_fact:
_batch: "{{ _batch + [[ei.key, item.0.key, item.1]] }}"
with_subelements:
- "{{ ei.value|dict2items }}"
- value
- set_fact:
out: "{{ out|default([]) + _batch }}"
- include_tasks: next_loop.yml
loop: "{{ var1|dict2items }}"
loop_control:
loop_var: ei
- debug:
msg: "{{ item|join(',') }}"
loop: "{{ out }}"
gives the same result
msg: d1,t1,p1
msg: d1,t1,p2
msg: d1,t2,p1
msg: d2,t1,p1