Ansible merge list with dict - list

Question

I have below playbook in which I search for all vars starting with static_routes__ and then merge them.
---
- hosts: localhost
gather_facts: no
vars:
static_routes__host:
management:
- address: '0.0.0.0/0'
next_hop: '192.168.0.1'
static_routes__lab:
management:
- address: '1.1.1.1/32'
next_hop: '192.168.0.1'
static_routes__test:
test:
- address: '8.8.8.8/32'
next_hop: '192.168.2.1'
tasks:
- set_fact:
static_routes: "{{ static_routes | default({}) | combine(lookup('vars', item, default={}), recursive=True, list_merge='append') }}"
loop: "{{ query('varnames', 'static_routes__') }}"
- name: Output static_routes
debug:
var: static_routes
The above will result in:
TASK [Output static_routes] ***************************************************************************************************************************************************************
ok: [localhost] => {
"static_routes": {
"management": [
{
"address": "0.0.0.0/0",
"next_hop": "192.168.0.1"
},
{
"address": "1.1.1.1/32",
"next_hop": "192.168.0.1"
}
],
"test": [
{
"address": "8.8.8.8/32",
"next_hop": "192.168.2.1"
}
]
}
}
However the merge_list_ is only available in Ansible version > 2.9, which is currently not available to me due to company policies. I'm looking for a way to replicate above output in Ansible version =< 2.9.
With the below task I'm able to sort of reproduce it but it only allows one list item.
- set_fact:
static_routes: "{{ static_routes | default({}) | combine({vrf: route | default([]) }) }}"
loop: "{{ query('varnames', 'static_routes__') }}"
vars:
vrf: "{{ lookup('dict', lookup('vars', item)).key }}"
route: "{{ lookup('dict', lookup('vars', item)).value }}"
subnet: "{{ lookup('dict', lookup('vars', item)).value.0.address }}"
next_hop: "{{ lookup('dict', lookup('vars', item)).value.0.next_hop }}"
- name: Output static_routes
debug:
var: static_routes

Answer 1

Found the solution:
- set_fact:
static_routes_list: "{{ static_routes_list | default({}) | combine({item: lookup('vars', item)}) }}"
loop: "{{ query('varnames', 'static_routes__') }}"
- set_fact:
static_routes: "{{ static_routes|
default({})|
combine({item.0: item.1|json_query('[].value')|flatten | unique})
}}"
loop: "{{ static_routes_list|
dict2items|
json_query('[*].value')|
map('dict2items')|list|flatten|
groupby('key')
}}"

Answer 2

This one seems simpler
- set_fact:
_list: "{{ _list|default([]) + [lookup('vars', item)] }}"
loop: "{{ query('varnames', 'static_routes__') }}"
- set_fact:
static_routes: "{{ static_routes|default({})|
combine({item.0: item.1|json_query('[].value')|flatten}) }}"
loop: "{{ _list|map('dict2items')|map('first')|groupby('key') }}"
gives
static_routes:
management:
- address: 0.0.0.0/0
next_hop: 192.168.0.1
- address: 1.1.1.1/32
next_hop: 192.168.0.1
test:
- address: 8.8.8.8/32
next_hop: 192.168.2.1