---

- name: The selectattr filter can be used to filter a list, based on a criteria
  gather_facts: no
  hosts: localhost
  vars: 
    input:
    - id: 2555418101286
      system_name: hits
    - id: 2555418119094
      system_name: Say_Hello
    - id: 2555418119095
      system_name: Say_Goodbye
  tasks:
  - block:
    - debug:
        var: output
    - assert:
        that:
        - output|length == 1
        - (output|first).system_name == 'Say_Hello'
    vars:
      output: "{{ input|selectattr('id', 'equalto', id)|list }}"
      id: 2555418119094
  - block:
    - debug:
        var: output
    - assert:
        that:
        - output|length == 1
        - (output|first).id == 2555418119094
    vars:
      output: "{{ input|selectattr('system_name', 'equalto', system_name)|list }}"
      system_name: Say_Hello
  - block:
    - debug:
        var: output
    - assert:
        that:
        - output|length == 0
    vars:
      output: "{{ input|selectattr('system_name', 'equalto', system_name)|list }}"
      system_name: missing