How to use hosts in my playbook for initiating my template - ansible

Question

I have a playbook to initiate a conf to servers that requires hostname. I want to pass my hosts that define in playbook as group so as to loop the variables in my jinja2 template. And I don't want to set the hosts in vars(because that was already define in playbook, I don't know the reason for re-define)
For example:
host file:
[test_servers]
t1
t2
t3
[test2_servers]
t2
t4
playbook:
- hosts: test_servers
tasks:
- name: generate my conf
template:
src: templates/temp.conf.j2
dest: "test.conf"
force: True
vars:
hosts: test_servers # So far I need to declare the var here duplicately, I've group my server in host file and I just want to use the current group.
temp.conf
....
{% for host in groups[hosts] %}
Entry.{{ loop.index }} = {{ host }}
{% endfor %}
....
I wonder if there is a better way to pass the hosts that set in playbook to my jinja2 template so I can re-use the playbook for different hosts. For example, I just need to reset the playbook hosts to test2, no need to rewrite the vars.

Answer 1

There is no special variable with the name of the group, but there is ansible_play_hosts_all
List of all the hosts that were targeted by the play
Remove vars and use ansible_play_hosts_all in the template
- hosts: test_servers
tasks:
- name: generate my conf
template:
src: templates/temp.conf.j2
dest: "test.conf"
force: True
{% for host in ansible_play_hosts_all %}
Entry.{{ loop.index }} = {{ host }}
{% endfor %}