Loop over nested dict - ansible

Question

I need to iterate over a complex dict and apply properties from one key to another
I have tried many possibilities, such as with_nested, and with_subelements
I have an object as such
group_hosts:
- group:
name: a
hosts:
- host1
- host2
ports:
- 22
- 80
- group:
name: b
hosts:
- host3
- host4
ports:
- 22
- 80
And, given a host, I need to associate all the ports to it (host1 will have ports 22 and 80 associated to is, for example), so that in a later moment, while iterating I can use the wait_for module to check if the ports are open
The only workaround I found was to repeat the hostname for how many ports it had (by so doing I removed an extra list to loop)
More explicitly my var object became this
group_hosts:
- group:
name: a
hosts:
- name: host1
port: 80
- name: host1
port: 22
- name: host2
port: 22
- name: host2
port: 80
- group:
name: b
hosts:
- name: host3
port: 20
- name: host4
port: 2222
And my play this:
- name: traverse dict
debug:
msg: "group: {{item.0.group.name}} host is: {{item.1.name}} port is: {{item.1.port}}"
loop: "{{ group_hosts | subelements('group.hosts') | list }}"
But I don't like this workaround as I've had to modify the dict object by writing it in a less efficient way.
So, given the first dict object, how can I loop hosts and associate ports to them?
Meaning:
I want that given host1, I check its 22 and 80 ports, host 2 the same.
So:
hosts group a:
host1 : check ports 22, 80
host2: check ports 22, 80
hosts group b:
same as above
I already know how to "check" the ports on some host, my question is how to iterate such an object

Answer 1

Let's simplify the dictionary. The tasks below
- set_fact:
hosts2: "{{ hosts2|default({})|
combine({item.1:
{'name': item.0.group.name,
'ports': item.0.group.ports}}) }}"
loop: "{{ lookup('subelements', group_hosts, 'group.hosts') }}"
- debug:
var: hosts2
give a dictionary that can be easily iterated.
"hosts2": {
"host1": {
"name": "a",
"ports": [
22,
80
]
},
"host2": {
"name": "a",
"ports": [
22,
80
]
},
"host3": {
"name": "b",
"ports": [
22,
80
]
},
"host4": {
"name": "b",
"ports": [
22,
80
]
}
}