list of dictionary iteration - ansible

Question

I have local.yml file where I am passing variable as list
roles:
- role: book
vars:
data:
- 'std1'
- 'std2'
vars.yml mentioned as below
book_data:
"std1": "std1"
"std2": "std2"
"std1":
- '1a'
- '1b'
"std2":
- '2a'
- '2b'
I want to iterate data over list mentioned in local.yml and print value from vars.yml. I have written code which print only list(std1,std2)
- name: set fact
set_fact:
standard: "{{ lookup('list', data) }}"
- name: get standard
debug: msg="{{ item }}"
with_items: "{{ standard }}"
Expected output would be:
list mentioned in local.yml would call vars/main.yml content and fetch content.
Example: whenever I would call str1 it would fetch 1a and 1b,
str2 it would fetch 2a and 2b
Below sample code is working:
- name: get standard data
debug:
msg="{{ item.key }}"
with_items: "{{ lookup('dict', book_data) }}"
but I want specific the iteration call from local.yaml to vars/main.yml. Dont want to use vars/main.yml variable directly into playbook

Answer 1

Given the variables
data: [x, y]
book_data:
x: std1
y: std2
std1: [1a, 1b]
std2: [2a, 2b]
Iterate data, for example
- debug:
msg: "{{ lookup('vars', book_data[item]) }}"
loop: "{{ data }}"
gives (abridged)
msg:
- 1a
- 1b
msg:
- 2a
- 2b
, or create the structure
book_data_lists: |
{% for i in data %}
{{ i }}: {{ lookup('vars', book_data[i]) }}
{% endfor %}
gives
book_data_lists: |-
x: ['1a', '1b']
y: ['2a', '2b']
Iterate the dictionary with subelements
- debug:
msg: "{{ item.0.key }} {{ item.1 }}"
with_subelements:
- "{{ book_data_lists|from_yaml|dict2items }}"
- value
gives (abridged)
msg: x 1a
msg: x 1b
msg: y 2a
msg: y 2b
Example of a complete playbook for testing
- hosts: localhost
vars:
data: [x, y]
book_data:
x: std1
y: std2
std1: [1a, 1b]
std2: [2a, 2b]
book_data_lists: |
{% for i in data %}
{{ i }}: {{ lookup('vars', book_data[i]) }}
{% endfor %}
tasks:
- debug:
msg: "{{ item.key }}"
loop: "{{ lookup('dict', book_data) }}"
- debug:
msg: "{{ item.key }}"
loop: "{{ book_data|dict2items }}"
- debug:
msg: "{{ lookup('vars', book_data[item]) }}"
loop: "{{ data }}"
- debug:
var: book_data_lists
- debug:
msg: "{{ item.0.key }} {{ item.1 }}"
with_subelements:
- "{{ book_data_lists|from_yaml|dict2items }}"
- value