list of lists, to list of dicts?

[Dick Visser]

Hii

I have something like this in my vars:

test:
  - - host1
    - fd99:9999::1
  - - host1
    - 10.0.1.1
  - - host2
    - fd99:9999::1
  - - host2
    - 10.0.1.1
  - - foo
    - fd99:9999::1
  - - foo
    - 10.0.1.1
  - - baz
    - fd99:9999::1
  - - baz
    - 10.0.1.1

Each first and second list item should become keys in a dict, like this:

conv:
  - name: host1
    address: fd99:9999::1
  - name: host1
    address: 10.0.1.1
  - name: host2
    address: fd99:9999::1
  - name: host2
    address: 10.0.1.1
  - name: foo
    address: fd99:9999::1
  - name: foo
    address: 10.0.1.1
  - name: baz
    address: fd99:9999::1
  - name: baz
    address: 10.0.1.1

I tried a few things with mapping and filtering, but can't see how to do it....

any suggestions? Ideally no tasks, just filters....

thx

[Rowe, Walter P. (Fed)]

- name: list of list to list of dict

  hosts: localhost

  become: false

  gather_facts: false

  vars:

    test:

      - - host1

        - fd99:9999::1

      - - host1

        - 10.0.1.1

      - - host2

        - fd99:9999::1

      - - host2

        - 10.0.1.1

      - - foo

        - fd99:9999::1

      - - foo

        - 10.0.1.1

      - - baz

        - fd99:9999::1

      - - baz

        - 10.0.1.1

  tasks:

    - name: test

      debug: var=test

    - name: list 2 dict

      set_fact:

        list2dict: "{{ list2dict|default([]) + [ thisdict ] }}"

      loop: "{{ test }}"

      vars:

        thisdict: { name: "{{ item.0 }}", addr: "{{ item.1 }}" }

    - name: list2dict

      debug: var=list2dict

Walter
--
Walter Rowe, Division Chief
Infrastructure Services Division
Mobile: 202.355.4123

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[Rowe, Walter P. (Fed)]

https://docs.ansible.com/ansible/latest/collections/community/general/dict_filter.html

This is an even more elegant solution using the community.general.dict module:

    - name: list2dict

      set_fact:

        list2dict: >-

          {{ test | map('zip', ['name', 'addr'])

                | map('map', 'reverse')

                | map('community.general.dict') }}

    - name: list2dict

      debug: var=list2dict

Walter
--
Walter Rowe, Division Chief
Infrastructure Services Division
Mobile: 202.355.4123

[Dick Visser]

On Thu, 29 Aug 2024 at 13:38, 'Rowe, Walter P. (Fed)' via Ansible
Project <ansible...@googlegroups.com> wrote:
>
> https://docs.ansible.com/ansible/latest/collections/community/general/dict_filter.html
>
> This is an even more elegant solution using the community.general.dict module:
>
>
> - name: list2dict
>
> set_fact:
>
> list2dict: >-
>
> {{ test | map('zip', ['name', 'addr'])
>
> | map('map', 'reverse')
>
> | map('community.general.dict') }}

perfect, thx!!

[Todd Lewis]

That is elegant. Much better than the abomination I came up with:

---
# dick-visser-03.yml
- name: Add helper keys to list of dicts
  hosts: localhost
  connection: local
  gather_facts: no
  vars:
    test:
      - - host1
        - fd99:9999::1
      - - host1
        - 10.0.1.1
      - - host2
        - fd99:9999::1
      - - host2
        - 10.0.1.1
      - - foo
        - fd99:9999::1
      - - foo
        - 10.0.1.1
      - - baz
        - fd99:9999::1
      - - baz
        - 10.0.1.1
  tasks:
    - name: Dictify the test data - 1
      ansible.builtin.debug:
        msg:
          - 'test'
          - '{{ test }}'

          - '   test | map("map","community.general.dict_kv","value")'
          - '{{ test | map("map","community.general.dict_kv","value") }}'

          - '   test | map("map","community.general.dict_kv","value") | map("zip",[{"key":"name"},{"key":"address"}])'
          - '{{ test | map("map","community.general.dict_kv","value") | map("zip",[{"key":"name"},{"key":"address"}]) }}'

          - '   test
                | map("map","community.general.dict_kv","value")
                | map("zip",[{"key":"name"},{"key":"address"}])
                | map("map","flatten",1)
                | map("map","combine")'
          - '{{ test
                | map("map","community.general.dict_kv","value")
                | map("zip",[{"key":"name"},{"key":"address"}])
                | map("map","flatten",1)
                | map("map","combine") }}'

          - '   test
                | map("map","community.general.dict_kv","value")
                | map("zip",[{"key":"name"},{"key":"address"}])
                | map("map","flatten",1)
                | map("map","combine")
                | map("items2dict")'
          - '{{ test
                | map("map","community.general.dict_kv","value")
                | map("zip",[{"key":"name"},{"key":"address"}])
                | map("map","flatten",1)
                | map("map","combine")
                | map("items2dict") }}'

To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/6F5FBEE5-028A-4AB2-ADC9-5B2B535290F7%40nist.gov.

-- 
Todd

[Rowe, Walter P. (Fed)]

Thanks Todd. Honestly I came right off the dict module page that has an almost exact example.

Walter
--
Walter Rowe, Division Chief
Infrastructure Services Division
Mobile: 202.355.4123

To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/0d6ba760-b60c-4749-8fa6-8ccd623c0959%40gmail.com.