Select items from lists in Ansible

select_playbook.yml

--- 
## See 
## https://docs.ansible.com/ansible/latest/plugins/lookup/vars.html
## https://docs.ansible.com/ansible/latest/reference_appendices/faq.html#when-should-i-use-also-how-to-interpolate-variables-or-dynamic-variable-names
- name: select
  gather_facts: false
  hosts: localhost
  connection: local 

  vars:
  - users:
    - name: testuser1
      uid: 1002
      groups: 
        - wheel
        - staff 
      config:
        - home: "~"
        - temp: "~/temp"     
  
    - name: testuser2 
      uid: 1003 
      groups: 
        - staff
      config:
        - home: "/home/adriaan/"
        - temp: "/tmp/"     
  - select_name:
    - "testuser1"       

  tasks:
    - name: list users
      debug:
        msg: "users are: {{users}} "

    - name: get the first user
      debug:
        msg: "first user is: {{users[0]}} "

    - name: or get the first user like this
      debug:
        msg: "first user is: {{users | first}} "

    - name: get the first user name
      debug:
        msg: "and the name is : {{users[0].name}} "

    - name: select matched users with simple filter
      debug:
        msg: "user data is:  {{ users|  selectattr('name', 'match', 'testuser1') | list}}"

    - name: select users with simple filter  )
      debug:
        msg: "user data is:  {{ users|  selectattr('name', 'match', 'testuser') | list }}"

    - name: select users with 'equalto' result is generator with one item )
      debug:
        msg: "user data is:  {{ users|  selectattr('name', 'equalto', 'testuser1')}}"        

    - name: so we need to get the first
      debug:
        msg: "user data is:  {{ users|  selectattr('name', 'equalto', 'testuser1') | first}}"        

    - name: select users with a variable unfortunately ansible doesn't allow nesting 
      debug:
        msg: "user data is:  {{ users|  selectattr('name', 'match', {{select-name}}) | list }}"
      ignore_errors: yes 

    - name: so we need a to use look up
      debug: msg="{{ lookup('vars', myvar)}}"
      vars:
        myvar: select_name

    - name: result is a list get the first 
      debug: msg="{{ lookup('vars', myvar) | first}}"
      vars:
        myvar: select_name
      
    - name: all together
      debug:
        msg:  "user data is:  {{ users|  selectattr('name', 'equalto', lookup('vars', myvar) | first) | first }} "
      vars:
        myvar: select_name 

    - name: put it in a fact 
      set_fact:
        first_user: "{{ users|  selectattr('name', 'match', lookup('vars', myvar) | first) | first }}"  
      vars:
        myvar: select_name       

    - name: use it
      debug:
        msg: "{{ first_user }}"