Ansible select and combine attributes from a dictionary

Question

---
- name: Consolidate output
  hosts: localhost
  gather_facts: no
  vars:
    data_set_1:
      host1:
        field1: '1'
        field2: '2'
      host2:
        field3: '3'
        field4: '4'
      host3:
        field1: '1'
        field3: '3'
      host4:
        field5: '5'
        field6: '6'
    data_set_2:
      - host1
      - host2
      - host3

I just need to parse through both the data sets and build the list of fields and the value for hosts in data set 2.

For example, data_set_2 has three hosts host1, 2 and 3. Corresponding data from data_set_1 for host1, 2 and 3 is host1: field1: '1' field2: '2' host2: field3: '3' field4: '4' host3: field1: '1' field3: '3'

From this, I just need to build the result like this.

result = {
  field1: "1",
  field2: "2",
  field3: "3",
  field4: "4"
}

How can I do this from ansible playbook?

Hi Anees, welcome to SO. This site is not a "write code for me" site; you will want to include the code you have tried and the error you are getting when you run it. — mdaniel
Hints to where to look at in the documentation for possible ways to solve your problem: extracting values from containers, unique filter, json_query filter... — Zeitounator

Vladimir Botka Vladimir Botka · Accepted Answer · 2020-01-01T14:33:33

combine dictionaries in the loop of the list created by map and extract. For example

- set_fact:
    result: "{{ result|default({})|combine(item) }}"
  loop: "{{ data_set_2|map('extract', data_set_1)|list }}"
- debug:
    var: result|to_nice_json

give (export ANSIBLE_STDOUT_CALLBACK=yaml)

  result|to_nice_json: |-
    {
        "field1": "1",
        "field2": "2",
        "field3": "3",
        "field4": "4"
    }

Ansible select and combine attributes from a dictionary

1 Answers