ansible with_dict fails when provided with set_fact variable - dictionary

Question

I am trying to dynamically provide dictionary name for interface variables.
My ansible task looks like this.
- name: Setting interface list
set_fact:
one_fact: "{{ host_name }}_interfaces"
- name: deb
debug: var={{ one_fact }}
- name: Managing Interfaces
ios_interface:
enabled: "{{ item['value']['enabled'] }}"
name: "{{ item['key'] }}"
state: "{{ item['value']['state'] }}"
with_dict: "{{ one_fact }}"
Dictionary looks something like this
---
h1_interfaces:
Ethernet1/1:
description: Firewall
enabled: true
speed: auto
state: present
Ethernet1/2:
description: asd
enabled: true
speed: auto
state: present
h2_interfaces:
Ethernet1/1:
description: Firewall
enabled: true
speed: auto
state: present
Ethernet1/2:
description: asd
enabled: true
speed: auto
state: present
When i set with_dict: {{ one_fact }} i get an error FAILED! => {"msg": "with_dict expects a dict"}
But when i provide with with_dict: {{ h1_interfaces }} it works like a charm. What am i doing wrong?

Answer 1

Apparently you have a variable host_name too, which is set to h1 or h2, and you want to access the dictionaries: h1_interfaces/h2_interfaces.
To construct dynamically the variable name and access its value, you should use the lookup plugin, please see below task:
- name: Setting interface list
set_fact:
one_fact: "{{ lookup('vars', myvar + '_interfaces') }}"
vars:
myvar: "{{ host_name }}"
and a slightly altered playbook to demonstrate the result:
playbook:
---
- hosts: localhost
gather_facts: false
vars:
host_name: h1
h1_interfaces:
Ethernet1/1:
description: Firewall
enabled: true
speed: auto
state: present
Ethernet1/2:
description: asd
enabled: true
speed: auto
state: present
h2_interfaces:
Ethernet1/1:
description: Firewall
enabled: true
speed: auto
state: present
Ethernet1/2:
description: asd
enabled: true
speed: auto
state: present
tasks:
- name: Setting interface list
set_fact:
one_fact: "{{ lookup('vars', myvar + '_interfaces') }}"
vars:
myvar: "{{ host_name }}"
- name: deb
debug: var=one_fact
- name: Managing Interfaces
debug:
msg: "enabled: {{ item['value']['enabled'] }}, name: {{ item['key'] }}, state: {{ item['value']['state'] }}"
with_dict: "{{ one_fact }}"
result:
TASK [Managing Interfaces] *********************************************************************************************************************************************************************************************
ok: [localhost] => (item={'key': 'Ethernet1/1', 'value': {'description': 'Firewall', 'enabled': True, 'speed': 'auto', 'state': 'present'}}) => {
"msg": "enabled: True, name: Ethernet1/1, state: present"
}
ok: [localhost] => (item={'key': 'Ethernet1/2', 'value': {'description': 'asd', 'enabled': True, 'speed': 'auto', 'state': 'present'}}) => {
"msg": "enabled: True, name: Ethernet1/2, state: present"
}
cheers