I have this role (roles/dummy/tasks/main.yml) :

---
- debug: var=dum_name

and this playbook (test.yml) :

---
- hosts: localhost
  vars:
    name: "{{ foo_name | default('boom') }}"
  tasks:
  - debug: var=name
  roles:
  - { role: dummy, dum_name: "{{ name }}" }


If I define a variable "foo_name=bar" in the inventory file for localhost , 
I get this output :

TASK: [dummy | debug var=dum_name] 
******************************************** 
ok: [localhost] => {
    "var": {
        "dum_name": "boom"
    }
}

TASK: [debug var=name] 
******************************************************** 
ok: [localhost] => {
    "var": {
        "name": "bar"
    }
}

In the dummy task, I expected : "dum_name": "bar" .

In a real application, I need to use several times a same role with 
different parameters. A simple way to get the same thing is :

...
  roles:
  - { role: dummy, dum_name: "{{ foo_name | default('boom') }}" }

but the problem is the same : I get "boom" in the result instead of "bar" .

What is the solution/workaround ?

Regards,
Fabien

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