Match name: of the list1 to a name: of the list2 and get matches from the list2

I am trying to find matches based on list1 name: in list2, but as the result get the dict2 matches. I am using this with Ansible.

list1 :
  - name: game1
  - name: game3
list2:
  - name: game1
    type: application
    version: 123
    notes:
      type: url
      name: URLNAME
      page: https://urlname.com
  - name: game2
    type: application
    version: 223
    notes:
      type: url
      name: URLNAME
      page: https://urlname.com
  - name: game3
    type: application
    version: 333
    notes:
      type: url
      name: URLNAME
      page: https://urlname.com
  - name: game4
    type: application
    version: 443
    notes:
      type: url
      name: URLNAME
      page: https://urlname.com

Expected results:

results:
  - name: game1
    type: application
    version: 123
    notes:
      type: url
      name: URLNAME
      page: https://urlname.com
  - name: game3
    type: application
    version: 333
    notes:
      type: url
      name: URLNAME
      page: https://urlname.com

Or if it is easier, this result would suffice:

results:
  - name: game1
    type: application
    version: 123
  - name: game3
    type: application
    version: 333

This doesn't seem as a complex thing based on what I have googled and what people are trying to accomplish, but I am stuck.

Solution

Get the list of names. Then, selectattr test name in names

  names: "{{ list1|map(attribute='name') }}"
  results: "{{ list2|selectattr('name', 'in', names) }}"

gives

  results:
    - name: game1
      notes: {name: URLNAME, page: 'https://urlname.com', type: url}
      type: application
      version: 123
    - name: game3
      notes: {name: URLNAME, page: 'https://urlname.com', type: url}
      type: application
      version: 333

^{Example of a complete playbook for testing
- hosts: all

vars:

list1:
- name: game1
- name: game3
list2:
- name: game1
notes: {name: URLNAME, page: 'https://urlname.com', type: url}
type: application
version: 123
- name: game2
notes: {name: URLNAME, page: 'https://urlname.com', type: url}
type: application
version: 223
- name: game3
notes: {name: URLNAME, page: 'https://urlname.com', type: url}
type: application
version: 333
- name: game4
notes: {name: URLNAME, page: 'https://urlname.com', type: url}
type: application
version: 443

names: "{{ list1|map(attribute='name') }}"
results: "{{ list2|selectattr('name', 'in', names) }}"

tasks:

- debug:
var: results|to_yaml}

Depending on the use case, there are many other options:

Convert the list to a dictionary

  names: "{{ list2|map(attribute='name') }}"
  dict2: "{{ dict(names|zip(list2)) }}"

gives

  dict2:
    game1:
      name: game1
      notes: {name: URLNAME, page: 'https://urlname.com', type: url}
      type: application
      version: 123
    game2:
      name: game2
      notes: {name: URLNAME, page: 'https://urlname.com', type: url}
      type: application
      version: 223
    game3:
      name: game3
      notes: {name: URLNAME, page: 'https://urlname.com', type: url}
      type: application
      version: 333
    game4:
      name: game4
      notes: {name: URLNAME, page: 'https://urlname.com', type: url}
      type: application
      version: 443

Now, you can get the same results

  results: "{{ list1|map(attribute='name')|map('extract', dict2) }}"

, or easily iterate the list

    - debug:
        msg: "{{ dict2[item.name] }}"
      loop: "{{ list1 }}"

gives

ok: [test_01] => (item={'name': 'game1'}) => 
  msg:
    name: game1
    notes:
      name: URLNAME
      page: https://urlname.com
      type: url
    type: application
    version: 123
ok: [test_01] => (item={'name': 'game3'}) => 
  msg:
    name: game3
    notes:
      name: URLNAME
      page: https://urlname.com
      type: url
    type: application
    version: 333

^{Example of a complete playbook for testing
- hosts: all

vars:

list1:
- name: game1
- name: game3
list2:
- name: game1
notes: {name: URLNAME, page: 'https://urlname.com', type: url}
type: application
version: 123
- name: game2
notes: {name: URLNAME, page: 'https://urlname.com', type: url}
type: application
version: 223
- name: game3
notes: {name: URLNAME, page: 'https://urlname.com', type: url}
type: application
version: 333
- name: game4
notes: {name: URLNAME, page: 'https://urlname.com', type: url}
type: application
version: 443

names: "{{ list2|map(attribute='name') }}"
dict2: "{{ dict(names|zip(list2)) }}"
results: "{{ list1|map(attribute='name')|map('extract', dict2) }}"

tasks:

- debug:
var: dict2|to_yaml

- debug:
var: results|to_yaml

- debug:
msg: "{{ dict2[item.name] }}"
loop: "{{ list1 }}"}