ansible nested loop over a single dict - list

Question

I've got a list of dict like:
- { "a": "zzz", "b": [1, 2] }
- { "a": "yyy", "b": [7, 9] }
I need with ansible to loop over it so item would be successively:
- { "a": "zzz", "b": 1 }
- { "a": "zzz", "b": 2 }
- { "a": "yyy", "b": 7 }
- { "a": "yyy", "b": 9 }
How could I do that?

Answer 1

Perhaps it can be done in 1 task, but here is how i would do it:
You need 1 loop for the "master" list and then 1 dynamic loop for the list of the 'b' key. We will use an include_tasks task in order to process each dict of the "master" list, then in the included tasks file just a set_fact to loop the "b" key, and populate our variable.
CODE:
main.yml:
---
- hosts: localhost
gather_facts: false
vars:
source_var:
- { "a": "zzz", "b": [1, 2] }
- { "a": "yyy", "b": [7, 9] }
tasks:
- name: print var
include_tasks: "set_fact.yml"
with_items: "{{ source_var }}"
loop_control:
loop_var: itemoflist
- name: print var
debug:
var: target_var
included PB, called set_fact.yml:
- name: populate_var
set_fact:
target_var: "{{ target_var | default([]) + [{ 'a': itemoflist.a, 'b': item }] }}"
with_items:
- "{{ itemoflist['b'] }}"
variable created:
TASK [print var] *******************************************************************************************************************************************************************************************************
ok: [localhost] => {
"target_var": [
{
"a": "zzz",
"b": 1
},
{
"a": "zzz",
"b": 2
},
{
"a": "yyy",
"b": 7
},
{
"a": "yyy",
"b": 9
}
]
}
hope it helps.