Ansible - multiple roles -

i trying run multiple roles using with_items command, getting error:

"error! 'item' undefined"

role.yml:

--- - hosts: '{{ host }}'   become: yes    roles:     - role: "{{item}}"       with_items: "{{ roles }}" 

here command:

ansible-playbook -i ./inventory/dev ./playbooks/role.yml --extra-vars='{"host": "db", "roles": ["mysql", "apache"]}' 

you cannot way. with_ loops not valid roles.

^{if anything, need provide list of roles roles: directive, syntax list of host groups hosts: '{{ host }}'. problem is: ansible not resolve variable roles, roles: '{{ roles }}' not work.}

---

what can do, however, use include_role module in can access variables.

^{no, include_role module doesn't take {{ item }} with_items value name either.}

so workaround can think of (assuming don't want process json beforehand) include roles statically:

tasks:   - include_role:       name: "mysql"     when: "'mysql' in roles"   - include_role:       name: "apache"     when: "'apache' in roles" 

the roles need exist on control machine anyway, names predefined.